It’s 12:43AM and I just got back into my hotel room. I spent the past few hours in AMD’s suite a block from IDF trying to get to the bottom of an issue we discovered in our post on AMD’s Zacate GPU performance numbers earlier this week.

Let’s recap. Zacate is AMD’s 18W APU aimed at the mainstream notebook market (~$500 notebooks). The APU features a pair of Bobcat cores and a Cedar-class AMD DX11 GPU. Spending some time with the physical Zacate package, it seems to have a single 64-bit DDR3 memory interface ala Atom. Unlike Atom however, both the Bobcat cores and the DX11 GPU should be relatively high performance.

Earlier this week, AMD showed us the first public demonstration of Zacate. In its suite were two systems: a Zacate test platform and a Core i5-M 520 notebook from a major OEM. Both systems were configured with 4GB of memory and were running the 64-bit version of Windows 7 Premium.

AMD's Zacate

The first demo we saw on Monday was the system running City of Heroes. In CoH Zacate managed to reach frame rates around 2x of what we saw on the Core i5-M 520. AMD also ran through a number of IE9 performance tests including the Psychadelic HTML5 benchmark and the Amazon Shelf test. In both of those tests, the Zacate platform was significantly faster than the Core i5-M 520. And it was those IE9 tests that seemed suspect.

The Zacate test platform

I didn’t think much of it at first, but Zacate managed a ~10x performance advantage in the IE9 Psychadelic benchmark. While Zacate should have a higher performance GPU, it shouldn’t be that much faster. Something was amiss.

I borrowed a Core i5 notebook from Intel (we are at IDF after all) and ran the same tests on it. The performance was much better than what I saw in AMD’s suite. I went back to AMD to find out exactly what was going on.

I brought up the issue and AMD immediately began looking into it. AMD used the latest drivers made available for this particular Core i5 notebook on the manufacturer’s website. Those drivers were version 2104 dated 3/31/10. AMD explained that these systems were configured about a month before launch and they were using the latest drivers available on the manufacturer’s website at the time. This particular OEM didn’t offer a newer version of the Intel HD Graphics drivers via its website. To make matters worse, Intel’s updated HD Graphics driver wouldn't install on the notebook. Some notebook OEMs prefer to provide their own display driver updates. In those cases, the Intel HD Graphics drivers available from won’t install. Despite only having a single Core i5 machine for all of its press demos for tomorrow, AMD agreed to let us manually install the driver (extract the driver and force device manager to update the driver manually) on the i5 system.


Intel Core i5-M 520 w/ latest drivers

The updated driver brought the IE9 performance tests to parity with Zacate. In fact, it looks like the IE9 benchmark doesn’t scale too far with GPU performance (apparently discrete cards don’t score much higher than what we’ve seen here).


Intel Core i5-M 520 w/ latest drivers

At this point we had an issue. The IE9 benchmarks AMD was showing off weren’t an accurate comparison of the two architectures. While valid for the only driver revision supported on this particular Core i5 notebook, the scores weren’t valid for a Zacate vs. Core i5 architecture comparison. AMD wanted to make sure there was no confusion about the GPU performance potential of Zacate so it allowed us to install whatever we wanted on both systems to validate the GPU performance we had seen.

Take a moment to realize exactly what just happened here. In an effort to convince us (and you) that it had nothing to hide and didn’t deliberately attempt to stack the deck, AMD gave us full access to the Zacate platform to do whatever we wanted. AMD wanted us to be completely comfortable with the Zacate comparison.

We downloaded the Batman Arkham Asylum demo off of Steam and loaded it on both the Zacate and Core i5 systems (AMD originally bought two copies of the full game via Steam only to find that SecureROM kept crashing on the Zacate platform at launch, way to go SecureROM). We set both machines to 1024 x 768 at high quality settings. We played through the beginning of the demo as well as FRAPSed a short walk through the first room you’re dropped in:

Batman, Core i5-M 520

Batman, Zacate

Batman Arkham Asylum, FRAPS Walkthrough, 1024 x 768 High Quality
  AMD Zacate Intel Core i5-520M
Batman 16.5 fps 11.3 fps

The actual gameplay was noticeably quicker on Zacate and the numbers show a 45% performance advantage. This is huge. To sanity check that data we fired up City of Heroes on both machines and played around with them. The frame rate varied depending on where you were in the scene and we saw peak frame rates close to the 2x advantage repeated in our second pass with updated Intel drivers. Note the differences in contrast below are due to the vastly different screens the two systems were using.

City of Heroes, Core i5-M 520

City of Heroes, Zacate

We put together a quick FRAPS walkthrough to show how the average frame rate improved:

City of Heroes, FRAPS Walkthrough, 1024 x 768 Low Quality
  AMD Zacate Intel Core i5-520M
City of Heroes 39.6 fps 25.5 fps

On average we saw a 55% improvement over the Core i5 system.

AMD wanted to highlight the DirectCompute performance of Zacate and let us publish the first results from the platform running the N-Body Simulation benchmark:

N-Body Simulation, DirectCompute Performance
  AMD Zacate Intel Core i5-520M
N-Body Simulation 23 GFLOPS 8.8 GFLOPS

AMD views Fusion as a way to not only bring better gaming performance to the market, but also enable a lot of new GPU compute applications. Remember that Zacate and Ontario are going into systems priced at around $500 or less. With this type of GPU compute in the entry level, it’s only a matter of time before developers start to do something with it.

The Zacate GPU performance we’re seeing here today is completely unoptimized as well. The clocks aren’t final, drivers aren’t fine tuned and although we’re close to release, there’s still potentially more performance on the table.

It’s very rare for any public company to make an on the spot decision to let us benchmark and publish test data of an unreleased part without having ever seen it before. The first time the AMDers in the suite saw Zacate running Batman was when we installed it. To be honest, it was probably the most open and flexible I’ve ever seen AMD be. I knew if the IE9 numbers changed that it would call the City of Heroes numbers into question. By allowing us to rerun everything as well as add an additional title (one that we’ve used more recently) AMD handled the situation perfectly.

At the end of the day my take on Zacate (and Ontario) hasn’t changed: these two APUs have the potential to make the low end netbook/notebook market interesting again.



View All Comments

  • larson0699 - Wednesday, September 15, 2010 - link

    Yeah, I think Anand mentioned that from his observations, "hardware accelerated" performance (i.e. IE9 on GPU) doesn't scale with GFLOPS, understandably so. What confuses me here is that the 6800 is pre-DX10 (I have a fuzzy memory of a DX10 requirement, geez, it was only earlier today I installed the beta for the first time) and that the 3800+ is in all ways weaker than the C2D (that's not fanboy talk -- I used to own a 3800+ and thought it was ludicrous speed) .. Indeed, the numbers seem almost random, like a mysterious performance rating a la Windows Experience Index (though that's much more telling).

    Don't feel bad. I can't even run Psychedelic -- I do all my modern experimenting on retail displays ;-)
  • Perisphetic - Thursday, September 16, 2010 - link

    This needs to be put into this!

    The Dell Duo is the first time a notebook/tablet convertible has been done right from the mechanical point of view. It's a far superior solution to transforming tablet/notebooks than that single middle joint garbage commonly found on these things. But the Duo currently lacks proper hardware to become truly awesome. Just the thought of Zacate in that thing is incredibly enticing.
  • 5150Joker - Wednesday, September 15, 2010 - link

    How does zacate stack up against sandy bridge graphics performance? Reply
  • Duraz0rz - Wednesday, September 15, 2010 - link

    They're in totally different market segments. It's fairly irrelevent to compare the two.

    Now if you were talking Llano, that's a different story.
  • djgandy - Wednesday, September 15, 2010 - link

    How is a comparison to i5 relevant but Sandybridge not? SB is Intels fusion arch, and has CPU's that cover a wide range of targets, from ultra low power notebooks to high end gaming rigs.

    Comparing this to the current i5 is irrelevant.
  • flyck - Wednesday, September 15, 2010 - link

    sandy bridge is not released so you can't test it as a competitor.
    We only know anand gpu test for SB but this one has a larger clock than the mobile chips will have.

    Lowest speed bin for SB is rated at 35W which is 2x that of zacate. Not sure where the competition is in that. AMD used the i5 since that one has the highest ondie gpu for the current laptop segment.
  • djgandy - Wednesday, September 15, 2010 - link

    This is not released either!

    Also SB Will come in very low power parts (sub 20W) that target the ultra mobile laptop segment.

    Therefore the comparison to SB is valid, since both are un-released and SB will likely target the notch just above zacate which is far closer than a current i5 mobile is to it.
  • mczak - Wednesday, September 15, 2010 - link

    I agree comparison to SB would be nice. That said, we haven't seen any information on the ULV parts yet - these typically are released quite a bit later than the other parts. I think though SB should be faster - it has twice the memory bandwidth and can use L3 cache for graphics, both should help quite a bit (of course this only matters if your graphics core doesn't suck otherwise). There is no doubt though Zacate platform is cheaper.
    As for other performance comparisons, someone should compare these benchmarks to HD5450 - the graphics core could be very similar.
  • Mautaznesh - Tuesday, September 21, 2010 - link

    Silly Sir, thats like comparing an Turion to a desktop Core 2 quad.

    They're both for different platforms.

    Llano is the competitor to Sandy Bridge, and both come out at the same time even though for the longest time people thought Sandy Bridge would beat out Fusion APU's. Just wait and we'll see who will win the fight, Llano which is probably going to sit very well with mainstream (not enthusiast obviously) gamers, and 3d editors, etc...

    Zacate being compared to a note book based on Intel parts such as the i5 should be enough until We have a Llano vs SandyBridge benchmark comparison.
  • flyck - Wednesday, September 15, 2010 - link

    I never said they were, i said when it is not released a compitor cannot test with it.

    current SB shows as low as 35W, no ULVC are releasing any time soon. Again, as mentioned couple of times, the ULVC require a severe reduction in frequency for cpu and gpu, so no you cannot compare them to the SB we see in there current version.
    (i5M has almost 50% gpu-core clock advantage over the UM).
    Even if the low power ULVC are going to compete on a power level, they will not on a cost level. die size is huuuge compared to zacate and so will the selling price. Basically they will still be in total different markets.

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