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Llano GPU Performance vs. DDR3 Speed

Desktop Llano processors feature the same dual-channel memory controller as their mobile counterparts. Their memory support however is far more robust. You get a maximum of four DIMM slots on a desktop Llano motherboard (up from two SO-DIMM slots on a mobile Llano), and the chip officially supports memory speeds up to DDR3-1866 (1600 is the limit for mobile Llano). The added memory bandwidth is most useful in feeding the on-die Radeon GPU.

Across our seven titles we found that on average DDR3-1600 resulted in a 12.6% increase in performance over DDR3-1333 at 1024 x 768. Moving up to higher resolutions only increased the advantage by under 2%. Using DDR3-1866 showed around a 20% increase in performance over DDR3-1333.

Note that this is in stark contrast to Intel's Sandy Bridge, which based on our testing does not seem to gain a lot from faster memory:

Although we're just showing Crysis Warhead here as an example, we couldn't find any tangible evidence of performance scaling with faster memory speeds across any of the other titles we tested as well.

With memory pricing being as low as it is these days, it makes the most sense for someone building a Llano machine with intention of gaming to equip it with DDR3-1866 memory. A quick survey of Newegg shows the cheapest price for a 4GB DDR3-1333 or 1600 kit as $35 while 1866 will set you back $60.

CPU Performance GPU Performance
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  • AnandThenMan - Thursday, June 30, 2011 - link

    What happened to them, I thought it was stated that they will be up "in a few hours". And what about some DX11 tests, seeing Llano is capable, why not run a few DX11 games to see what it can do? Reply
  • crocin - Thursday, June 30, 2011 - link

    Would be interesting to see how this A8-3850(150$?) will fair vs an intel pentium G840 + amd 5670(85$+70$=155$). Simply because these are the 2 options one would have when picking up a system with same money yeah?

    Also, wont this system would make so much more sense, if mobo makers came out with a 20$ motherboard w\o pci-e, hell no old school pci slots either. One 4gb ram slot of speeds upto 1866. Hmmm, that will bring AMD into the win for ultra cheap desktops. Or I am just crazy maybe. :p ANyway, always best part about AT is the technical part and the colorful graphs yey,
    Reply
  • triclops41 - Thursday, June 30, 2011 - link

    Slap this in a windows version of a Mac Mini and you have the coolest HTPC/portable 720p gaming system around. Almost as good as a PS3 or 360, tiny, quiet and versatile. Reply
  • JoJoman88 - Friday, July 01, 2011 - link

    To me this just will not due for desktop at all. I can see the positives for notebooks and all but unless there is a greater range to crossfire with this is no use to me. Isn't that the problem with PS3 and 360, you are stuck with the video that the unit comes with at the time of purchase. Yes you could just pop in a better Fusion chip later and keep the rest of the system the same,that is better that what you can do with a PS 3 or 360. I have at least 5 AMD video cards that will smoke this thing.

    I know AMD will improve the Fusion line in the future. but they will never come even with the latest separate CPU and video card. Is Open CL really going to be that big of a deal that you will need the feature. I can't see this APU doing Open CL and gaming at the same time. Would, or do games use Open CL/Direct Compute at the the same time as Direct X. Would they not be using the same GPU at the same time and choke the system down.What about multitasking, you couldn't run a Open CL/Direct Compute at the same times as you were playing a DX game at the same time without killing the GPU Right ?!?

    I just don't see what good except as others have said that this desktop stuff is aimed for OEM's to save money and raise the preformance of their lower end computers. I am open to that i'm totally wrong about how this works.
    Reply
  • bhima - Saturday, July 02, 2011 - link

    The Llano APU in a desktop just makes absolutely no sense as a budget gaming system unless you really only want the APU's graphics. Otherwise, if you are planning to actually buy a cheap discrete GPU you'll already surpass Llano's on-board offering with like a $50 board AND you won't be severely bottlenecked by their piss-poor performing CPU. The mobile Llano's make sense, but the desktop ones are just too damn gimped compared to the i3... the lowest performing Intel processor.

    /yawn wake me up when Bulldozer gets here.
    Reply
  • Aone - Sunday, July 03, 2011 - link

    When you did the price calculation of Llano vs. Athlon you forgot to include MB price.
    Llano MB prices are >100$ today.
    And IMO, Phenom X2+d.GPU is much better option for gaming PC than Athlon X4.
    Reply
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  • Idanisi - Thursday, August 11, 2011 - link

    would crossfire work with a nvidia video card? Reply

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