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AMD's Excavator Core is Leaner, Faster, Greener

btarunr

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AMD gave us a technical preview of its next-generation "Carrizo" APU, which is perhaps the company's biggest design leap since "Trinity." Built on the 28 nm silicon fab process, this chip offers big energy-efficiency gains over the current-generation "Kaveri" silicon, thanks to some major under-the-hood changes.

The biggest of these is the "Excavator" CPU module. 23 percent smaller in area than "Steamroller," (same 28 nm process), Excavator features a new high-density library design, which reduces die-area of the module. Most components are compacted. The floating-point scheduler is 38% smaller, fused multiply-accumulate (FMAC) units compacted by 35%, and instruction-cache controller compacted by another 35%. The "Carrizo" silicon itself uses GPU-optimized high-density metal stack, which helps with the compaction. Each "Excavator" module features two x86-64 CPU cores, which are structured much in the same way as AMD's previous three CPU core generations.



The compaction in components doesn't necessarily translate into lower transistor-counts over "Kaveri." In fact, Carrizo features 3.1 billion transistors (Haswell-D has 1.4 billion). Other bare-metal energy optimizations include an 18% leakage reduction over previous generation, using faster RVT components, which enables 10% higher clock speeds at the same power-draw (as "Kaveri"). A new adaptive-voltage algorithm reduces CPU power draw by 19%, and iGPU power draw by 10%. AMD introduced a few new low-power states optimized for mobile devices such as >9-inch tablets and ultra-compact notebooks, which reduces overall package power draw to less than 1.5W when idling, and a little over 10W when active. In all, AMD is promising a conservative 5% IPC uplift for Excavator over Steamroller, but at a staggering 40% less power, and 23% less die-area.



The integrated-GPU is newer than the one featured on "Kaveri." It features 8 compute units (512 stream processors) based on Graphics CoreNext 1.3 architecture, with Mantle and DirectX 12 API support, and H.265 hardware-acceleration, with more than 3.5 times the video transcoding performance increase over "Kaveri." For notebook and tablet users, AMD is promising "double-digit percentage" improvements in battery life.

Now, if only AMD can put six of these leaner, faster, and greener "Excavator" modules onto an AM3+ chip.

View at TechPowerUp Main Site
 
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"Now, if only AMD can put six of these leaner, faster, and greener "Excavator" modules onto an AM3+ chip."

I hope also so because if they do it, I would immediately go a buy the plaform with it.
 
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AMD themselves stated that Piledriver was the end of the line for AM3+

I think the next big CPU from AMD will feature a new socket and new architecture. Maybe Zen?
 
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AMD themselves stated that Piledriver was the end of the line for AM3+

I think the next big CPU from AMD will feature a new socket and new architecture. Maybe Zen?

Yes, unfortunately this Excavator core is very mobile systems centric and kind of "useless" for a desktop CPU. :(

Which is a shame because I do NOT care about anything mobile now. /#egoismmodeswitchedon
 
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Hopefully it would deliver.. else this excavator would be digging them a deeper grave.
 

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6x Excavator AM3+ could be this generation's "Thuban" before Zen.
 
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So IPC is going up 5% and power consumption is going down 30%. If they use this architecture improvements in their desktop CPUs, they are better off with upping the clocks than adding more cores IMO.
 
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So IPC is going up 5% and power consumption is going down 30%.

This might be true only in a limited area of the frequency / power curve....
 
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AMD themselves stated that Piledriver was the end of the line for AM3+

I think the next big CPU from AMD will feature a new socket and new architecture. Maybe Zen?

AM3+ being killed off was well over due. It was old, gotta replace socket with something once and a while else cpu's get held back by old and slow parts. I mean that as not a bash but it was time that, 3 and half years old (october 2011).
 
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AM3+ being killed off was well over due. It was old, gotta replace socket with something once and a while else cpu's get held back by old and slow parts. I mean that as not a bash but it was time that, 3 and half years old (october 2011).

Only if you consider the socket itself as a bottleneck spot which is not serious.
 
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Genuine question, how does AMD expect to compete with Intel when they're process node size is double that of the Skylake CPU's?
 
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Did you saw any Skylake CPU's on the market? They are delayed in 2016.

So realistically it has no sense to compare who has what.

As long as the CPU doesn't use too much power, I don't care if it's made in 100nm techology :)
 
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these could make for some very, very nice 9-10" windows tablets
 
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Genuine question, how does AMD expect to compete with Intel when they're process node size is double that of the Skylake CPU's?

AMD is expecting to move to a new process with Zen sometime in 2016.

At that time, the process gap will be largely gone.
 

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Genuine question, how does AMD expect to compete with Intel when they're process node size is double that of the Skylake CPU's?
Intel and AMD measure node sizes differently. They're actually not as dissimilar as you think they are, but that isn't to say that Intel doesn't have a smaller process than AMD, it's just over exaggerated because of how it's measured. I wish I could find the article, but IIRC it describes how Intel measures more of the width of any given circuit where AMD excludes the very outside edge where Intel includes it, or something along those lines. So in reality, something like 16nm for Intel would be something like 20nm by how AMD measures it. It's important to keep that in mind and if I end up finding the article, I'll add it.
 
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power consumption looks ok then we need some benchmark
 
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Intel and AMD measure node sizes differently.

Somewhat.

They're actually not as dissimilar as you think they are, but that isn't to say that Intel doesn't have a smaller process than AMD, it's just over exaggerated because of how it's measured.

 

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AM3+ being killed off was well over due. It was old, gotta replace socket with something once and a while else cpu's get held back by old and slow parts. I mean that as not a bash but it was time that, 3 and half years old (october 2011).
Yeah, you have to replace the socket (and chipset) eventually, but AMD didn't do that. They killed AM3+ without offering a newer socket, or offering 6-8 core chips for FM2+. This is after they tried to pump up everyone on the MOAR CORES system. If I have to buy a quad core, the i5 smears the a10 across the walls. I'm still waiting for an upgrade from the fx6300.....
 
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Interesting to say the least, would really be nice to see the power reduction numbers in action on a laptop (Or other mobile device) to see how much better the battery life is on the chip compared with the steam roller chips. Would also be nice if the GPU received a nice step up in platform because that would make the mobile media house laptops more appealing with that chip inside.

But we have to wait for further details/proof before we decide anything.
 
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I preferr this now often-referenced article:

https://www.semiwiki.com/forum/content/3884-who-will-lead-10nm.html

Up to 14nm Intel/20nm Fab Club they seem fairly similar enough to state one notch larger node from AMD is similar to one size smaller from Intel.

When you start getting to 14nm from the CPA, things start to get switched around. My best guess (and the numbers more-or-less follow the logic) to this is Intel will be targeting the low-power/lower-end of the voltage curve in favor of density, where-as Samsung/GF may target higher performance in effort to be more TSMC-like (notice how the CPA/TSMC essentially end in the same place). I haven't gone deep where they got their 14/16nm numbers from in relation to version of process, but it meshes pretty cleanly with TSMC shooting for roughly 10% smaller chips with 16ff+ vs earlier 16nm (which would bring them in line with the CPA 14nm process for density), and the CPA having 'early' vs 'plus' versions of the 14nm process, which the later is supposed to improve speed/power consumption (read: be more like TSMC).
 
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