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Intel Meteor Lake Could Bring Back L4 Caches

In the latest Linux Kernel patches, Intel engineers are submitting initial support for Meteor Lake processor generation, with some interesting potential features. In a patch submitted yesterday, the Intel engineer noted, "On MTL, GT can no longer allocate on LLC - only the CPU can. This, along with the addition of support for ADM/L4 cache, calls a MOCS/PAT table update." What this translates to is that starting from Meteor Lake, the integrated graphics can no longer allocate on the last-level cache (LLC), the highest numbered cache accessed by the cores before fetching from memory. Instead, only the CPU cores can allocate to it. Even more interesting is the mention of the Meteor Lake platform's level 4 (L4) cache. For the first time since Haswell and Broadwell, Intel may be planning to bring back the L4 cache and integrate it into the CPU.

Usually, modern processors use L1, L2, and L3 caches where the L1 version is the fastest and smallest, while the others are larger but slower. The inclusion of L4 caches often is unnecessary, as this type of cache can consume a big area on the processor die while bringing little benefit, translating to the cost of manufacturing drastically soaring. However, with Meteor Lake and its multi-die tile design, we wonder where the L4 cache will end up. We could see integration into the base tile, which holds the compute cores and essential compute elements. This makes the most sense since the logic needs access to fast memory, and L4 could improve the performance in specific applications.

Intel "Raptor Lake Refresh" to Retain 13th Gen Core Branding

Intel is planning to update its desktop processor product-stack in the second half of 2023 with the Core "Raptor Lake Refresh" series. A VideoCardz report suggests that these chips could remain a part of the 13th Gen Core series, and Intel will not carve the 14th Gen Core out of them. This would be similar to how Intel dealt with delays in the commissioning of its 14 nm node by releasing the "Haswell Refresh" and "Devil's Canyon" processors within the 4th Gen Core family. Intel tried something different with "Coffee Lake Refresh," by branding it inside the 9th Gen Core series, instead of keeping it within the 8th Gen Core. This was done because Intel updated the CPU core-counts of its Core i7 SKUs, and introduced the new Core i9 brand extension for the mainstream-desktop segment.

If 4th Gen Core "Haswell Refresh" is anything to go by, Intel could use updated xx50 processor model numbers for "Raptor Lake Refresh" processors. An example of such a naming scheme would be the Core i9-13950K, which succeeds the i9-13900K (the i9-13900KS is a limited edition / limited-release SKU). At this point we don't know what exactly constitutes this Refresh, other than the high likelihood of clock-speed increases across the board. It's possible that Intel may innovate in the areas of die-thinning, die-binning, and process-level power improvements that open up room for these higher clock-speeds (which is what Intel did with 10th Gen "Comet Lake"). These processors could be built in the existing Socket LGA1700 package, and be compatible with existing Intel 600-series and 700-series chipset motherboards, requiring a UEFI firmware update.

Intel Disables DirectX 12 API Loading on Haswell Processors

Intel's fourth-generation Core processors, codenamed Haswell, are subject to new security exploits. According to the company, a vulnerability exists inside the graphics controller of 4th generation Haswell processors, happening once the DirectX 12 API loading occurs. To fix the problem, Intel has found that disabling this API results in a fix. Starting with Intel graphics driver 15.40.44.5107 applications that run exclusively on DirectX 12 API no longer work with the following Intel Graphics Controllers: Intel Iris Pro Graphics 5200/5100, HD Graphics 5000/4600/4400/4200, and Intel Pentium and Celeron Processors with Intel HD Graphics based on 4th Generation Intel Core.

"A potential security vulnerability in Intel Graphics may allow escalation of privilege on 4th Generation Intel Core processors. Intel has released a software update to mitigate this potential vulnerability. In order to mitigate the vulnerability, DirectX 12 capabilities were deprecated." says the Intel page. If a user with a Haswell processor has a specific need to run the DirectX 12 application, they can downgrade their graphics driver to version 15.40.42.5063 or older.

AMD Ryzen 3000 and Older Zen Chips Don't Support SAM Due to Hardware Limitation, Intel Chips Since Haswell Support it

AMD Ryzen 3000 "Matisse" processors based on the "Zen 2" microarchitecture, as well as older AMD processors based on "Zen+" and "Zen" microarchitectures, do not support the company's Smart Access Memory (SAM) feature being introduced with Radeon RX 6000 series graphics cards. SAM is essentially a branding of the Resizable Base-Address Register (Resizable-BAR) feature developed by the PCI-SIG; which enables a processor to see a graphics card's entire video memory as a single addressable block, rather than through 256-megabyte apertures. Apparently the PCI-Express root complex of Ryzen 5000 "Vermeer" processors introduce an instruction called full-rate _pdep_u32/64, which is required for resizable-BAR to work.

It gets more interesting—Intel processors have been supporting this feature since the company's 4th Gen Core "Haswell," which introduced it with its 20-lane PCI-Express gen 3.0 root-complex. This means that every Intel processor dating back to 2014 can technically support Resizable-BAR, and it's just a matter of motherboard vendors releasing UEFI firmware updates for their products (i.e. Intel 8-series chipsets and later). AMD extensively advertises SAM as adding a 1-2% performance boost to Radeon RX 6800 series graphics cards. Since this is a PCI-SIG feature, NVIDIA plans to add support for it on some of its GPUs, too. Meanwhile, in addition to AMD 500-series chipsets, even certain Intel 400-series chipset motherboards started receiving Resizable BAR support through firmware updates.

Continuing 14 nm Supply Shortages Lead Intel to Reintroduce Haswell-based, 22 nm Pentium G3420

"Nothing Really Ends" is the title of a song from dEUS, a Belgian "art-rock" band. And it would seem this applies all too well to the world of technology too. Intel has issued a Product Change Notification (PCN) which has changed the previously dead and buried, Haswell-era, 22 nm Pentium G3420 from its "Discontinued" status back to a worded "canceling this Product Discontinuance completely per new roadmap decision and enabling the product long term once again." Which means the Pentium G3420 will have a new lease of life, and will be available to customers until May 2020, with final shipments on December of the same year.

This is clearly an attempt from Intel to increase part availability for OEMs and system manufacturers, who have already been quoted as considering AMD due to both increases in performance and efficiency in their processors, as well as constrained supply from Intel, with giant Dell already having pointed the finger at Intel as a cause for their lower than expected revenue.

Microsoft Pushes Intel "Haswell" Microcode Update to Harden Against MDS

Microsoft started deploying microcode updates to some of Intel's older Core, Pentium, and Celeron processor generations through Windows Update. The latest Cumulative Update packages chronicled under "KB4497165" apply to machines running Intel's 4th generation Core "Haswell" processors, and low-power Pentium and Celeron chips based on "Apollo Lake," "Gemini Lake," "Valley View," and "Cherry View" microarchitectures.

The microcode update provides firmware-level hardening against four major variants of the MDS class of security vulnerabilities, namely CVE-2019-11091 (MDS Uncacheable Memory), CVE-2018-12126 (Microarchitectural Store Buffer Data Sampling), CVE-2018-12127 (Microarchitectural Load Port Data Sampling), and CVE-2018-12130 (Microarchitectural Fill Buffer Data Sampling).

New "BranchScope" Side-channel CPU Vulnerability Threatens Modern Processors

In the age of cyber-security vulnerabilities being named by their discoverers, much like incoming tropical storms, the latest, which exploits speculative execution of modern processors, is named "BranchScope," discovered by academics from four US universities, Dmitry Evtyushkin, Ryan Riley, Nael Abu-Ghazaleh, and Dmitry Ponomarev. The vulnerability has been successfully tested on Intel "Sandy Bridge," "Haswell," and "Skylake" micro-architectures, and remains to be tested on AMD processors. It bears similarities to "Spectre" variant 2, in that it is an exploit of the branch prediction features of modern CPUs.

BranchScope differs from Spectre variant 2, in that while the latter exploits the branch target buffer, BranchScope goes after the directional branch predictor, a component that decides which speculative operations to execute. By misdirecting it, attackers can make the CPU read and spit out data from the memory previously inaccessible. The worst part? You don't need administrative privileges to run the exploit, it can be run from the user-space. Unlike CTS-Labs, the people behind the BranchScope discovery appear to have alerted hardware manufacturers significantly in advance, before publishing their paper (all of it, including technicals). They will present their work at the 23rd ACM International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS 2018), later today.

Intel Finally Ready With Security Microcode Updates for Broadwell, Haswell

Via updated documents on its Microcode Revision guide, Intel has revealed that they have finally developed and started deploying microcode security updates for their Broadwell and Haswell-based microprocessors. The microcode update comes after a flurry of nearly platform-specific updates that aimed to mitigate known vulnerabilities in Intel's CPUs to the exploits known as Spectre and Meltdown.

While that's good news, Intel's patching odyssey still isn't over, by any means. According to Intel's documentation, the Spectre fixes for Sandy Bridge and Ivy Bridge are still in beta and are being tested by hardware partners, so that's two other architectures that still remain vulnerable. Of course, this discussion of who's vulnerable and isn't really can't be reduced to which architectures Intel has released its updates to. Users have to remember that the trickle-down process from Intel's patch validation and distribution through manufacturers to end users' systems is a morose one, and is also partially in the hands of sometimes not too tech-savy users. Time will tell if these flaws will have any major impact in some users or businesses.

Intel Announces Root Cause of Meltdown, Spectre Patch Reboot Issue Identified

Intel has finally come around towards reporting on the state of the reboot issues that have been plaguing Intel systems ever since the company started rolling out patches to customers. These patches, which aimed to mitigate security vulnerabilities present in Intel's chips, ended up causing a whole slew of other problems for Intel CPU deployment managers. As a result of Intel's investigation, the company has ascertained that there were, in fact, problems with the patch implementation, and is now changing its guidelines: where before users were encouraged to apply any issued updates as soon as possible, the company now states that "OEMs, cloud service providers, system manufacturers, software vendors and end users stop deployment of current versions, as they may introduce higher than expected reboots and other unpredictable system behavior." A full transcription of the Intel press release follows.

Colorful Intros H81A-BTC V20 Motherboard for Cryptocurrency Mining

Quite a few motherboard manufacturers are designing boards for crypto-currency mining rigs. The idea behind these boards is to serve up as many PCI-Express add-on card slots as possible, so miners can wire those slots out through risers, and drive way more than 7 GPU/ASIC cards. This makes for a better investment than building additional machines for more than 7 cards. Crypto-currency mining isn't bandwidth-heavy, and so even PCI-Express x1 provides sufficient connectivity for mining cards. The H81A-BTC V20 from Colorful is a socket LGA1150 motherboard, which takes in old "Haswell" and "Broadwell" CPUs, a pair of DDR3 memory modules, and puts out seven PCI-Express slots, of which one is x16, and the rest x1. The board draws power from 6-pin PCIe and 4-pin Molex, besides 8-pin EPS and 24-pin ATX, to cope with add-on cards that don't have their own power sources.

AMD Ryzen Machine Crashes to a Sequence of FMA3 Instructions

An AMD Ryzen 7-1800X powered machine was found to be crashing upon execution of a very specific set of FMA3 instructions by Flops version 2, a simple open-source CPU benchmark by Alexander "Mystical" Yee. An important point to note here is that this little known benchmark has been tailored by its developer to be highly specific to the CPU micro-architecture, with separate binaries for each major x64 architecture (eg: Bulldozer, Sandy Bridge, Haswell, Skylake, etc.), and as such the GitHub repository does not have a "Zen" specific binary.

Members of the HWBot forums found that Ryzen powered machines crash on running the Haswell-specific binary, at "Single-Precision - 128-bit FMA3 - Fused Multiply Add." The Haswell-specific binary (along with, we imagine, Skylake), adds support for the FMA3 instruction-set, which Ryzen supports, and which lends some importance to the discovery of this bug. What also makes this important is because a simple application, running at user privileges (i.e. lacking special super-user/admin privileges), has the ability to crash the machine. Such a code could even be executed through virtual machines, and poses a security issue, with implications for AMD's upcoming "Naples" enterprise processor launch.

Thecus Announces the N12580 and N16850 NAS Servers

Thecus Technology Corp, today announced the launch of two new enterprise-class NAS, the N12850 and N16850. These 12 and 16-bay network-attached storage solutions offer massive scalability, exceptional performance, supporting cross-platform file sharing, schedulable snapshots and resilient data integrity, to ensure a highly efficient working environment.

"Businesses today are seeking a NAS system that can best handle the demanding day-to-day high storage needs that occur in the workplace. Our new enterprise-class N12850 and N16850 NAS series are the solution. With advanced data protection and integrity mechanisms, these rackmounts NAS provide the ideal choice for storing a business's crucial data." said Florence Shih, CEO of Thecus Technology Corp.

Intel Readies "Never Stop Gaming" Game Bundle

Intel isn't new to giving away games or in-game DLC with its processors. The company is making a comeback on that front with an even bigger game bundle. Called "Never Stop Gaming," it rewards buyers of the company's Core i7 processors (Skylake, Haswell-E, and Haswell LGA1150); with $125 worth games/DLCs. These include Just Cause 3, Counter Strike: Global Offensive, and World of Warships ($50 worth items and in-game currency). The offer will be applicable to retail channel boxed processor purchases, as well as branded PCs with Core i7 processors. The bundle will be shipped as a voucher given with each Core i7 product purchase, which can be redeemed on Intel website. It is valued at $125, with the $60 Just Cause 3, $50-worth in-game goodies for World of Warships, and $15 worth Counter Strike: Global Offensive. The offer will be retailer specific.

Black Ops III: 12 GB RAM and GTX 980 Ti Not Enough

This year's installment to the Call of Duty franchise, Black Ops III, has just hit stores, and is predictably flying off shelves. As with every ceremonial annual release, Black Ops III raises the visual presentation standards for the franchise. There is, however, one hitch with the way the game deals with system memory amounts as high as 12 GB and video memory amounts as high as 8 GB. This hitch could possibly be the reason behind the stuttering issues many users are reporting.

In our first play-through of the game with its highest possible settings on our personal gaming machines - equipped with a 2560 x 1600 pixels display, Core i7 "Haswell" quad-core CPU, 12 GB of RAM, a GeForce GTX 980 Ti graphics card, NVIDIA's latest Black Ops III Game Ready driver 385.87, and Windows 7 64-bit to top it all off, we noticed that the game was running out of memory. Taking a peek at Task Manager revealed that in "Ultra" settings (and 2560 x 1600 resolution), the game was maxing out memory usage within our 12 GB, not counting the 1.5-2 GB used up by the OS and essential lightweight tasks (such as antivirus).

Thermaltake Announces DPS-G Gold and Bronze PSUs with Smart Power Management

Thermaltake, introduces the Smart DPS G Gold (750W/650W) and Bronze (700W/600W) digital power supply units (PSU) combined with the Smart Power Management (SPM) System. The Smart DPS G incorporates various high-tech components, leading technology, 32 Bit Microcontroller Unit (MCU) from Microchip Technology, and Eco-friendly features, 80 PLUS Gold and Bronze certification with semi-modular cables that always accommodate any mainstream build under any circumstance.

The combination of Smart DPS G and DPS G software provides clean and stable power and three intelligent platforms - DPS G PC APP 2.0, DPS G Smart Power Management Cloud 1.0, and DPS G Mobile APP 1.0 - for users to monitor and record the status of power consumption, voltage distribution, and electricity cost for advance usage.

Arbor Solution Introduces Powerful, Rugged Fanless Box PCs

Arbor Solution introduces its FPC-7800 series of powerful, rugged fanless box computers. The FPC-7800 inherits the features of model FPC-7700, while updating the previous platform with a newer, more efficient Intel chipset. The new series offers a variety of configurations to cater to different expansion requirements, may be used in a variety of environmental conditions, and provides multiple storage options. The unit may also be mounted in a variety of ways.

"With its tremendous flexibility, the FPC-7800 is undoubtedly the flagship of our popular line of box PCs," noted Brian Yurkiw, Arbor Solution vice president. "Including the Intel Q87 chipset and a 4th generation Intel Core processor enhances the unit's manageability and security for the most demanding needs. Following in the footsteps of its predecessor, model FCP-7700, the FCP-7800 is an ideal fanless box computer for applications such as a controller on oil rigs; a control box on an assembly line; a vehicle computer, especially in cold conditions; and a machine vision component, where it excels due to its capability of housing a powerful i7 processor."

Intel Skylake De-lidded, Reveals Tiny Die

When Japanese tech publication PC Watch got under the hood (lid) of a Core i7-6700K quad-core processor, what they found was an unexpectedly small silicon, that's shorter in proportion to its width, than previous dies from Intel, such as Haswell-D, and Ivy Bridge-D. It's smaller than even the i7-5775C, despite the same 14 nm process, because of its slimmer integrated graphics core with just 24 execution units (compared to 48 on the i7-5775C), and the lack of an external 128 MB SRAM cache for the iGPU.

The substrate Intel is using on the i7-6700K was found to be slimmer than the one on the i7-4770K, at 0.8 mm thick, compared to 1.1 mm on the latter. The thicker IHS (integrated heatspreader) makes up for the thinner substrate, so it shouldn't cause problems with using your older LGA1150 coolers on the new socket. Intel is using a rather viscous silver-based TIM between the die and the IHS. The die is closer to the center of the IHS than its predecessors were. PC Watch swapped out the stock TIM with Prolimatech PK-3 and Cool Laboratory Liquid Pro, and found some impressive drops in temperatures at stock speed (4.00 GHz) and with a mild overclock (4.60 GHz).

Moore's Law Buckles as Intel's Tick-Tock Cycle Slows Down

Intel co-founder Gordon Moore's claim that transistor counts in microprocessors can be doubled with 2 years, by means of miniaturizing silicon lithography is beginning to buckle. In its latest earnings release, CEO Brian Krzanich said that the company's recent product cycles marked a slowing down of its "tick-tock" product development from 2 years to close to 2.5 years. With the company approaching sub-10 nm scales, it's bound to stay that way.

To keep Moore's Law alive, Intel adopted a product development strategy it calls tick-tock. Think of it as a metronome that give rhythm to the company. Each "tock" marks the arrival of a new micro-architecture, and each "tick" marks its miniaturization to a smaller silicon fab process. Normally, each year is bound to see one of the two in alternation.

Logic Supply Previews its Upcoming ML600 Series Fanless PC

Industrial & embedded computer manufacturer Logic Supply has launched a preview of their upcoming ML600 Series of fanless and ventless industrial computer systems. Optimized for passive heat distribution, the new systems enable up to Intel i7 desktop processing without the need for a cooling fan, reducing a common failure point in commercial PCs and virtually eliminating noise.

"Logic Supply's goal is to offer our clients the ideal system to fit their needs," said Logic Supply Product Manager Logan Cooke. "While there are other systems on the market that may offer a certain number of COM ports, or i7 processing, or fanless cooling, or a ventless chassis, there was nothing available that combined all of these features into one system. With each of the ML600 systems we wanted to offer a computer that would offer users a unique combination of capabilities and connectivity."

Raidmax Intros XT-Series Entry-level PSUs

Raidmax announced three XT-series entry-level PSUs, the 300-Watt RX-300XT, the 400-Watt RX-400XT, and the 500-Watt RX-500XT. The three offer a very basic feature-set, but offer a few neat features such as a low-noise, temperature-controlled 120 mm fan; Core "Haswell" C-states support, a single +12V rail design, and modern electrical protection mechanisms, against over/under-voltage, overload, and short-circuit. The 300W model lacks PCIe power cables; the 400W model offers a single 6-pin cable; while the 500W tops it with a 6+2 pin cable in addition to the 6-pin. Other connectors include 24-pin ATX, 4+4 pin EPS, 4x SATA-power, and two 4-pin Molex. The company didn't announce pricing.

Gigabyte Intros Z97X-Game Plus Motherboard

From a sea of black and red, Gigabyte brushed a refreshing stroke of green, with its latest socket LGA1150 motherboard, the Z97X-Game Plus. Designed to compete with $150-ish mainline products such as ASUS Z97-Pro Gamer, which are loaded with gamer-centric features and product design, though barely missing premium gaming brands such as ROG or G1.Gaming; the new Z97X Game Plus could be particularly appealing to gamers with "green" (read: reference NVIDIA) gaming PC builds. The Z97X-Game Plus is a socket LGA1150 motherboard, with out of the box support for 5th gen Core "Broadwell" processors, in addition to Core "Haswell."

The board draws power from 24-pin ATX and 8-pin EPS power connectors. An 8-phase VRM conditions it for the CPU, which is wired to four DDR3 DIMM slots, and three PCI-Express 3.0 x16 slots (x16/NC/NC or x8/x8/NC or x8/x4/x4). Other expansion slots include three PCI-Express 2.0 x1 and one legacy PCI. Storage connectivity includes six SATA 6 Gb/s ports (from which two wire out as SATA-Express 10 Gb/s), and one M.2 (PCIe 2.0 x2 physical layer). Notable features include Gigabyte's famed AMP-UP onboard audio, with an EMI-shielded 115 dBA SNR CODEC, ground-layer isolation, audio-grade electrolytic caps, and an OPAMP with tuning for music and gaming; Broadcom Killer E2200 gigabit Ethernet, six USB 3.0 ports, and dual-UEFI BIOS. Expect a $140-150 pricing.

95W TDP of "Skylake" Chips Explained by Intel's Big Graphics Push

Intel's Core "Skylake" processor lineup, built on the company's swanky new 14 nanometer fab process, drew heads to its rather high 95W TDP for quad-core parts such as the Core i7-6700K and Core i5-6600K, even though their 22 nm predecessors, such as the i7-4770K and the i5-4670K run cooler, at 84W TDP. A new leaked slide explains the higher TDP. Apparently, Intel is going all-out with its integrated graphics implementation on Core "Skylake" chips, including onboard graphics that leverage eDRAM caches. The company is promising as much as 50% higher integrated graphics performance over "Haswell."

Although the chips have high rated TDP, the overall energy efficiency presents a different story. SoCs based on "Skylake" will draw as much as 60% lower power than "Haswell" based ones, translating into 35% longer HD video playback on portable devices running these chips. Intel's graphics performance push is driven by an almost sudden surge in display resolutions, with standards such as 4K (3840 x 2160) entering mainstream, and 5K (5120 x 2880) entering the enthusiast segment. Intel's design goal is to supply the market with a graphics solution that makes the two resolutions functional on desktop and video, if not gaming.

AMD to Emphasize on "Generation" with Future CPU Branding

AMD is planning to play a neat branding game with Intel. Branding of the company's 2016 lineup of CPUs and APUs will emphasize on "generation," much in the same way Intel does with its Core processor family. AMD will mention in its PIB product packaging, OEM specs sheets, and even its product logo (down to the case-badge), that its 2016 products (FX-series CPUs and A-series APUs) are the company's "6th generation." 2016 marks prevalence of Intel's Core "Skylake" processor family, which is its 6th generation Core family (succeeding Nehalem/Westmere, Sandy Bridge, Ivy Bridge, Haswell, and Broadwell). AMD is arriving at its "6th generation" moniker counting "Stars," "Bulldozer," "Piledriver," "Steamroller," and "Excavator," driving its past 5 generations of APUs, and the occasional FX CPU.

It turns out that the emphasis on "generation" is big with DIY and SI retail channels. Retailers we spoke with, say that they find it easier to break through Intel's often-confusing CPU socket change cycle, which ticks roughly every 18-24 months. Customers, they say, find it easier to simply mention the "generation" of Core processor they want, to get all relevant components to go with them (such as motherboard and memory bundles). While AMD's FX brand clearly didn't see generations beyond "Piledriver," the company's decision to unify the socket for its FX and A-Series product lines next year, with AM4, makes "6th generation FX processor" valid.

Desktop OEMs Begin Listing "Broadwell" Chips, "Skylake" Arrives in Q3

Major pre-built desktop manufacturers began listing products driven by 5th generation Core "Broadwell" processors, which are having a brief stint at the markets before being replaced by 6th generation Core "Skylake" processors in Q3-2015. The 5th Generation Core family is led by two parts, the Core i5-5675C, and the Core i7-5775C, both of which come with unlocked base-clock multipliers, are based on Intel's new 14 nanometer silicon fab process, and built in the LGA1150 package, compatible with existing Intel 9-series chipset based motherboards, with BIOS updates.

The Core i5-5675C and i7-5775C aren't exactly successors of the i5-4690K and i7-4790K. The i7-5775C is placed in a product tier Intel calls "P1+," while the i5-5675C is placed in one called "MS2+." The two aren't exactly in the same plane as P1K (eg: i7-4790K) or MS2K (eg: i5-4690K), respectively, and don't qualify as P1 (eg: i7-4790 non-K) or MS2 (eg: i5-4690 non-K). The two still feature unlocked multipliers. This places them somewhere between P1K/MS2K and P1/MS2. Both the i5-5675C and i7-5775C are quad-core chips, and physically feature just 6 MB of L3 cache. The i7-5775C has access to all 6 MB of it, while the i5-5675K features just 4 MB.

ASRock Develops Mini-ITX LGA2011v3 Motherboard with Quad-Channel Memory

They've done it! After building the first LGA2011v3 motherboard in the mini-ITX form-factor, letting you cram up to 8 "Haswell" cores into a lunchbox-sized PC, albeit having to make do with just dual-channel memory; ASRock developed the first mini-ITX motherboard with not just LGA2011v3, but also its full quad-channel memory interface, called the EPC612D4I. There's just one rider, which shouldn't really be a dealbreaker - this is a server-grade motherboard, and is bound to be expensive.

The EPC612D4I achieves its quad-channel memory chops by using smaller DDR4 SO-DIMM slots instead of standard-sized DIMM slots. Availability of aftermarket DDR4 SO-DIMM memory is close to non-existent, but that could change with 6th Generation Core processor notebooks hitting the shelves by Holiday 2015. As an enterprise board, it also supports Xeon E5-1600 V3 and E5-2600 V3 processors.
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