AMD announces Garlic and Onion flavours on their first HSA chips

Subject: Processors | January 14, 2014 - 02:52 PM |
Tagged: a10-6700, a8-6500, a8-7600, amd, APU, hsa, i3-4330, Kaveri

Not only are the first Kaveri reviews arriving today, the A10-7850K is up for sale on both NewEgg and Amazon and the A10-7700K is available on NewEgg.  This new part, at 45W competes favourably with the previous 100W Trinity APU in most tests and when Ryan boosted it to 65W it gained a little more.  The Steamroller cores have been updated but not in a way that has a huge effect on CPU performance, on the other hand the 384 SIMD units composing the GPU portion of this chip are quite impressive, 1080p gaming of current generation titles is possible on this chip and we haven't seen it's big brother with 512 SIMD units yet.  In the Tech Report's review you can see that BF4 is playable on this chip and this is not the Mantle version optimized for AMD's new architecture.  It is also a pity that Thief was unavailable to see just what TrueAudio is capable of.  Unfortunately this chip will not find its home in gamers dream machines, that is simply not where AMD is targeting its CPUs.  However, for SFF systems that need to be energy efficient and where a discrete GPU is to big to fit Kaveri will usher in a new level of performance.

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"AMD's next-generation APU packs in a ton of innovation, including updated "Steamroller" CPU cores, GCN graphics, and advanced HSA features. But is it enough to restore AMD's competitiveness in desktop processors?"

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The AMD Kaveri Architecture

Kaveri: AMD’s New Flagship Processor

How big is Kaveri?  We already know the die size of it, but what kind of impact will it have on the marketplace?  Has AMD chosen the right path by focusing on power consumption and HSA?  Starting out an article with three questions in a row is a questionable tactic for any writer, but these are the things that first come to mind when considering a product the likes of Kaveri.  I am hoping we can answer a few of these questions by the end of this article, but alas it seems as though the market will have the final say as to how successful this new architecture is.

AMD has been pursuing the “Future is Fusion” line for several years, but it can be argued that Kaveri is truly the first “Fusion” product that completes the overall vision for where AMD wants to go.  The previous several generations of APUs were initially not all that integrated in a functional sense, but the complexity and completeness of that integration has been improved upon with each iteration.  Kaveri takes this integration to the next step, and one which fulfills the promise of a truly heterogeneous computing solution.  While AMD has the hardware available, we have yet to see if the software companies are willing to leverage the compute power afforded by a robust and programmable graphics unit powered by AMD’s GCN architecture.

(Editor's Note: The following two pages were written by our own Josh Walrath, dicsussing the technology and architecture of AMD Kaveri.  Testing and performance analysis by Ryan Shrout starts on page 3.)

Process Decisions

The first step in understanding Kaveri is taking a look at the process technology that AMD is using for this particular product.  Since AMD divested itself of their manufacturing arm, they have had to rely on GLOBALFOUNDRIES to produce nearly all of their current CPUs and APUs.  Bulldozer, Piledriver, Llano, Trinity, and Richland based parts were all produced on GF’s 32 nm PD-SOI process.  The lower power APUs such as Brazos and Kabini have been produced by TSMC on their 40 nm and 28 nm processes respectively.

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Kaveri will take a slightly different approach here.  It will be produced by GLOBALFOUNDRIES, but it will forego the SOI and utilize a bulk silicon process.  28 nm HKMG is very common around the industry, but few pure play foundries were willing to tailor their process to the direct needs of AMD and the Kaveri product.  GF was able to do such a thing.  APUs are a different kind of animal when it comes to fabrication, primarily because the two disparate units require different characteristics to perform at the highest efficiency.  As such, compromises had to be made.

Continue reading our review of the new AMD Kaveri A8-7600 APU!!