Wednesday, March 15th 2017
AMD Shares Details on Ryzen DDR4 Memory Support and Upcoming AM4 Updates
In a blog post titled "Tips for Building a Better AMD Ryzen System", AMD has shed some light on the current memory support quirks with their Ryzen CPUs. First interesting detail: Ryzen processors do not offer memory dividers for DDR4-3000 or DDR4-3400. As such, AMD recommends that users looking to use higher memory speeds with their Ryzen processors instead look towards 3200 or 3500 MT/s. Due to Ryzen's preferences when it comes to memory, AMD also recommends that users pay particular attention to motherboard vendor's memory QVL lists for speeds greater than DDR4-2667.
Remember RAM importance on Ryzen processors' performance, which is given newfound importance in alleviating possible bottlenecks related to AMD's Data Fabric, the interconnect technology being used to communicate between different CCX's in AMD's 8-core Ryzen 7 and upcoming 6-core Ryzen 5 processors. Higher data rate of your memory subsystem should better help Ryzen's inter-core communication, and thus allow for higher performance in multiple scenarios, more so than with any other current CPU architecture.
In this regard, AMD seems to have obtained good internal results with some 2933, 3200, and 3500 MT/s rated memory configurations, namely 16GB kits based on Samsung "B-die" memory chips. Potential kits that AMD has tested to pair well with Ryzen include Geil EVO X (GEX416GB3200C16DC [16-16-16-36 @ 1.35v]); G.Skill Trident Z (F4-3200C16D-16GTZR [16-18-18-36 @ 1.35v]) and the Corsair CMK16GX4M2B3200C16 (VERSION 5.39 [16-18-18-36 @ 1.35v]).
AMD also stressed incoming updates in regards to memory support of its AM4 platform, with updates being pushed to motherboard makers this May, which should enable support for memory at speeds "higher than the current DDR4-3200 limit without refclk adjustments." For reference, see below memory support tables according to memory speed, rank, and quantities supported by Ryzen processors.
Source:
Community.amd.com
Remember RAM importance on Ryzen processors' performance, which is given newfound importance in alleviating possible bottlenecks related to AMD's Data Fabric, the interconnect technology being used to communicate between different CCX's in AMD's 8-core Ryzen 7 and upcoming 6-core Ryzen 5 processors. Higher data rate of your memory subsystem should better help Ryzen's inter-core communication, and thus allow for higher performance in multiple scenarios, more so than with any other current CPU architecture.
AMD also stressed incoming updates in regards to memory support of its AM4 platform, with updates being pushed to motherboard makers this May, which should enable support for memory at speeds "higher than the current DDR4-3200 limit without refclk adjustments." For reference, see below memory support tables according to memory speed, rank, and quantities supported by Ryzen processors.
31 Comments on AMD Shares Details on Ryzen DDR4 Memory Support and Upcoming AM4 Updates
I hope it's just a microcode/EFI thng. Sooner would be better. ;)
for those who trusted ASUS read 3400 mhz and expected it to work.
Motherboards may run higher speeds, but it doesn't mean it's supported, Do you think Intel Officially supports crazy high clock memory?
NO!
2400 mhz max supported on I7 LGA1156
Looks like Asus has removed 2933MHz support on the Crosshair board though.
For example my Rampage Gene 2, it claims 2000MHz support for RAM. Yes it boots, does it work stable? Nada... I haven't got it stable with multiple modules too... 1800MHz is max stable... I had the same for other X58 boards too btw... tried many sticks that does work fine in X79 at 2400MHz, also four 1366 cpu's I have around.
It is just for records, existent multi in bios... like seeing 200FSB for a Pentium III board, I've booted only 185 once thou lol... the board has the feature... but no real life guarantees.
That's layf... just tag along.
My Z sticks are capped at 3200 c14 right now, but could easily do higher with looser timings.
I'm okay with this, was about to ditch my corsair kit, until i read their page.
G.SKILL Announces Flare X Series and FORTIS Series DDR4 Memory for AMD Ryzen
AMD-Tuned DDR4-3200MHz CL14 64GB(4x16GB)
Not needing to sacrifice frequency for capacity, G.SKILL's R&D team achieved an impressive overclock on a 64GB (4x16GB) kit to frequencies of DDR4-3200MHz at ultra-low timings of CL14-14-14-34. See below for a validation screenshot for the kit on the ASUS ROG Crosshair VI Hero motherboard and the AMD Ryzen 7 1700 processor:
AMD-Tuned DDR4-3466MHz CL16 16GB(2x8GB)
Further pushing the boundaries of 16GB (2x8GB) memory kits on the AM4 platform, G.SKILL tuned it to a blistering fast DDR4-3466MHz CL 16-16-16-36. Tested on the 8-core AMD Ryzen 7 1700 processor and ASUS ROG Crosshair VI Hero motherboard, this is the fastest G.SKILL memory kit that's been designed for AMD thus far. See below for the validation screenshot:
Can't wait to see what kinda #s we get once the BIOSes are sorted ;)
So yeah, external clock generator, and fiddling. A bit too much for your average user, even those who are somewhat enthusiastic and OC their CPUs, the RAM side of things might be too complicated for them.
DDR4 Memory Scaling on AMD AM4 Platform – The Best Memory Kit For AMD Ryzen CPUs
www.legitreviews.com/ddr4-memory-scaling-amd-am4-platform-best-memory-kit-amd-ryzen-cpus_192259/4#F6v4ipw0jXMq54im.99
The Vishera 8350 / 8320 and all comes with 1866MHz DDR3 support. In OC you can easily archieve DDR2400Mhz. In OC yes, it's always experimental and one result does not reflect the other.
The 200Mhz FSB is also in OC mode, and proberly requires extreme cooling and high voltage to archieve that. It's never a guarantee.
Just saying.
The Corsair CMK16GX4M2B3200C16 VERSION 5.39 [16-18-18-36 @ 1.35v] is NOT a Samsung B-Die, it's SK Hynix and will NOT clock above 2666mhz on an Asus Crosshair VI Hero on not only my board but also a friend who bought the exact same setup, the CORSAIR CMK16GX4M2B3200C16 ver4.31 16-18-18-36 @ 1.35V however IS a Samsung B-Die and will behave as expected. Caveat Emptor.