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CPU Benchmarks: PhysX Enabled

Batman: Arkham Asylum: GPUs, CPUs, And PhysX Performance
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We were somewhat puzzled by the results we saw when we benchmarked the Radeon cards at the different PhysX settings. Strangely enough, the minimum and average frame rates stayed static between the Normal and High PhysX settings, even though the GeForce cards showed a large performance hit for the minimum frame rate.

We therefore ran a couple of tests using Radeon cards with PhysX enabled at different CPU speeds:

This would seem to make sense, because the frame rates go down with lower clock rates. Here's the weird part, though. We took note of CPU utilization during a specific part of the game benchmark, a PhysX-heavy segment where a guard is walking through smoke. Results were repeatable and consistent over several runs:

Why is CPU utilization lower when PhysX is enabled? And why is CPU utilization so low at all? If the CPU is bottlenecking the PhysX calculations, shouldn't the increased load be pushing the CPU to its limits?

Maybe we can make more sense of this if we look at how the CPU is handling threads:

Rather than clearing things up, the results of this testing have only left us more puzzled. We can recall that the PhysX API is supposed to be optimized for multiple threads, yet on the Core i7, only a single thread seems to be stressed when PhysX is cranked up. We're trying to get clarification from the developers at Rocksteady about this phenomenon--it's almost as though the game is artificially capping performance at a set level, and is then using only the CPU resources it needs to reach that level. On the Core i7, PhysX is using fewer resources than it does on the Phenom II. This would make sense if there was an artificial performance cap, as the i7 has shown to outperform AMD's architecture. However, the benchmarks show us a correlation between actual performance and raw CPU speed on either CPU.

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Top Comments
  • 12 Hide
    JeanLuc , November 9, 2009 7:33 AM
    NPD numbers show this game as currently being one of the least popular PC games - 92nd in fact.

    Nice article BTW, it's sad that the developers were paid off by Nvidia to drop support of AA on AMD cards (in game menu AA support that, there is a work round for ATI cards) as this shows just how morally bankrupt Nvidia is these days.

    And just for the record this isn't a case of AMD not 'supporting developers' as Nvidia would lead you to believe. Never mind the fact it can be enabled via a hack, Richard Hubby from AMD has uploaded an email he got from the developers of Batman Arkham Asylum saying there would be lawsuit if they changed to games code to enable game menu support of AA on ATI cards.
  • 11 Hide
    curnel_D , November 9, 2009 6:23 AM
    Don--it's almost as though the game is artificially capping performance at a set level, and is then using only the CPU resources it needs to reach that level. On the Core i7, PhysX is using fewer resources than it does on the Phenom II. This would make sense if there was an artificial performance cap, as the i7 has shown to outperform AMD's architecture.

    With Nvidia pushing proprietary API's like CUDA and PhysX, they're at a point where these things are some of the largest selling points of their products.

    With this in mind, and given Nvidia's past Anti-Consumer business practices, I think we can all expect to see a lot more of this kind of thing in the future with TWIMTBP games.
Other Comments
  • 4 Hide
    burnley14 , November 9, 2009 5:36 AM
    Excellent article as usual, Mr. Woligroski. Keep up the good work!
  • 1 Hide
    Kohlhagen , November 9, 2009 6:03 AM
    I just bought an ATI 5000 series card.. can i use my second PCI-E slot with the nvidia 220 to support physX? (i doubt it because AMD/Nvidia GPUs together cause driver issues)
  • 11 Hide
    curnel_D , November 9, 2009 6:23 AM
    Don--it's almost as though the game is artificially capping performance at a set level, and is then using only the CPU resources it needs to reach that level. On the Core i7, PhysX is using fewer resources than it does on the Phenom II. This would make sense if there was an artificial performance cap, as the i7 has shown to outperform AMD's architecture.

    With Nvidia pushing proprietary API's like CUDA and PhysX, they're at a point where these things are some of the largest selling points of their products.

    With this in mind, and given Nvidia's past Anti-Consumer business practices, I think we can all expect to see a lot more of this kind of thing in the future with TWIMTBP games.
  • -7 Hide
    2shea , November 9, 2009 6:31 AM
    @ kohlhagen: with an ati 5000 card you probably won't need that second card if you don't play on the highest resolution.
  • 6 Hide
    anamaniac , November 9, 2009 6:53 AM
    Wow... that's pathetic. This game should have the words stamped on it: Nvidia only!
  • 4 Hide
    noob2222 , November 9, 2009 7:18 AM
    Interesting find on the CPU useage with ATI cards. It would appear that Nvidia programmed Physix not to unload programming to the cpu, instead forcing it to the GPU only. Just a speculation since it is thier option.
  • -3 Hide
    sohei , November 9, 2009 7:23 AM
    this game runs great on any hardware but but , nvidia is just nvidia
    why you sell a game to all the people when is just for nvidia cards ?
    that.s why i love google.... google sell free things, nvidia is the opposite
  • 12 Hide
    JeanLuc , November 9, 2009 7:33 AM
    NPD numbers show this game as currently being one of the least popular PC games - 92nd in fact.

    Nice article BTW, it's sad that the developers were paid off by Nvidia to drop support of AA on AMD cards (in game menu AA support that, there is a work round for ATI cards) as this shows just how morally bankrupt Nvidia is these days.

    And just for the record this isn't a case of AMD not 'supporting developers' as Nvidia would lead you to believe. Never mind the fact it can be enabled via a hack, Richard Hubby from AMD has uploaded an email he got from the developers of Batman Arkham Asylum saying there would be lawsuit if they changed to games code to enable game menu support of AA on ATI cards.
  • 0 Hide
    sohei , November 9, 2009 7:34 AM
    when you benchmarked intel cpu you use turbo feature? tom
  • 0 Hide
    descendency , November 9, 2009 8:36 AM
    JeanLucthere is a work round for ATI cards) as this shows just how morally bankrupt Nvidia is these days.

    Just don't forget about those morally bankrupt Intel people!!!

    -NVidia.
  • 9 Hide
    curnel_D , November 9, 2009 8:49 AM
    descendencyJust don't forget about those morally bankrupt Intel people!!! -NVidia.

    There's one thing Intel has that Nvidia doesn't: A top performing product. With the 3xx series no where in sight, Nvidia seems to be relying more and more on their proprietary API's to sell their cards.

    While Intel leads the market in innovation, Nvidia seems like they would be completely content leaving graphics technology right where it's at, if they had the choice.
  • 9 Hide
    curnel_D , November 9, 2009 8:53 AM
    KohlhagenI just bought an ATI 5000 series card.. can i use my second PCI-E slot with the nvidia 220 to support physX? (i doubt it because AMD/Nvidia GPUs together cause driver issues)

    Yes, but only through old drivers or a workaround. I'm currently doing the same thing with a 4850x2 and a 9600 GSO.

    The PhysX API is a great thing. The guys who made it had a brilliant thing going. But it'd be a TON better if Nvidia converted it to the OpenCL standard. If they don't, it's going to end up as a 'could have been' technology.
  • 5 Hide
    sohei , November 9, 2009 8:59 AM
    "could have been' great words
  • 3 Hide
    scrumworks , November 9, 2009 9:05 AM
    Tom is pressing hard keeping nvidia in footlights these days. They don't have DX11 and they don't have mainstream/high end 40nm cards. Reviewing twimtbp PhysX title with nvidia's vendor lock AA implementation is one way to show how "nvidia cards rock".
  • -2 Hide
    Ciuy , November 9, 2009 9:10 AM
    PhysX sucks ...
  • 2 Hide
    alterecho , November 9, 2009 9:56 AM
    aa can only be enabled if you have a geforce 8 series in this game. It is
    impossible to use in any ati cards.

    ati changed it's hardware id on one it's card and they were able to
    enable aa and guess what, the performance was same as that of geforce and not much performance hit. i think don forced aa via catalyst which cripples the frames.
  • 1 Hide
    verrul , November 9, 2009 10:13 AM
    wierd with a workaround as others have done ati cards 48xx cards get the free x4 aa something is really fishy with the physix though
  • 1 Hide
    juliom , November 9, 2009 10:22 AM
    scrumworksTom is pressing hard keeping nvidia in footlights these days. They don't have DX11 and they don't have mainstream/high end 40nm cards. Reviewing twimtbp PhysX title with nvidia's vendor lock AA implementation is one way to show how "nvidia cards rock".


    Amen brother...
  • -4 Hide
    Anonymous , November 9, 2009 10:41 AM
    can anyone show me how to enable PhysX if I only have an ati HD 4870 ? I tought that wasn't possible. But I don't know now after seeing this article...
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