Test Setup

Our test configurations today consist of the ASUS P5K-Deluxe sporting the new P35 chipset and the Intel D975XBX2KR based on the venerable 975X chipset. Our retail P5K-Deluxe board was purchased recently even though an embargo is supposedly in place until June 4th for distribution of P35 product. Likewise, P35 boards from other suppliers such as MSI and Gigabyte can also be purchased at this time making this one of the stranger product releases in recent memory.

The P5K-Deluxe features ASUS's C.G.I. technology from their P965 motherboards. ASUS C.G.I. stands for ASUS Cross Graphics Impeller (marketing still reigns) and is a feature that when enabled will automatically optimize system performance if a CrossFire configuration is detected. These optimizations occur within the Direct Media Interface between the P35 MCH and ICH9R that is utilized to enable CrossFire operation on this motherboard.

The 975X chipset utilizes Peer-to-Peer write capability within the MCH to enable 2x8 PCI Express lane capabilities for CrossFire. This feature is not available in the P965 or P35 without a special PCIe controller chip and BIOS support. ATI/AMD enables CrossFire support utilizing the Direct Media Interface (DMI) to link the x16 GPU slot (16 PCI Express Lanes) residing on the MCH and the x4 GPU slot (4 PCI Express Lanes) residing on the ICH. Contrary to rumors and initial reports in certain forums, the P5K-Deluxe does not perform CrossFire operations with a 2x8 PCI Express lane configuration.

Standard Test Bed
CrossFire Test Configuration
Processor Intel Core 2 Duo QX6700
(2.66GHz, 8MB Unified Cache)
RAM OCZ Reaper PC2-9200 (4x1GB) 2.32V, 3-3-3-9 975X, 4-4-3-6 P35
Hard Drive Western Digital 150GB 10,000RPM SATA 16MB Buffer
System Platform Drivers Intel -
Video Cards 2 x MSI HD2900XT
Video Drivers ATI (HD2900XT Release Drivers)
CPU Cooling Tuniq 120
Power Supply OCZ ProXStream 1000W
Optical Drives Plextor PX-760A, Plextor PX-B900A
Case Cooler Master CM Stacker 830
Motherboards Intel D975XBX2KR (Intel 975X) - BIOS 2692
ASUS P5K Deluxe (Intel P35) - BIOS 0304
Operating System Windows Vista Ultimate 64-bit

Test conditions were maintained the same, as much as possible, over the platforms tested. Our game tests were run at settings of 1280x1024 4xAA, 1600x1200 4xAA, and 1920x1200 4xAA with 8xAF implemented in games that support this feature. These settings were used on both our single card and CrossFire setups. We feel like these settings and resolutions will provide accurate benchmark results for the typical user utilizing a CrossFire setup with a high end CPU.

All results are reported in our charts and color-coded for easier identification of results. We utilize new drive images on each board in order to minimize any potential driver conflicts. Our 3DMark results are generated utilizing the standard benchmark resolution for each program. We run each benchmark five times, throw out the two low and high scores, and report the remaining score. All results are run at stock speeds for this article although we will provide overclocked results in the next article. For those wondering, our cards generally had no issues running at 853/1000 provided we had notified the electric company of a pending power surge.

This preview is not a graphics card review and as such we are not including results with products from the Big Green Machine yet. Those comparisons will come in our P35 chipset article. We are simply providing results on how each chipset handles CrossFire operations at this time. We will provide P965 and RD600 results in our follow-up to this article so you can have a clear picture of which Intel chipset performs the best with a CrossFire configuration. We might even throw an RD580 into the mix to see how well the R600 performs on it.

We also booked several sessions with a psychologist so we can understand why there was a lapse in our thought process for choosing Windows Vista Ultimate 64-bit as our operating system. The R600 already has enough early driver issues to make one think twice about using it, but to throw a new operating system and chipset into the mix and then to push matters further by going 64-bit was clearly not the actions of a sane person. It sounded good at the time, it really did, but after several days of constant frustration, hair pulling, dog kicking (relax PETA, just a joke), finger nail chewing, and general panic attacks about missing the article deadline... well, we would have not have done it any differently as it turns out.

Why? Whether we like it or not, Vista is the future of Windows for the time being and is required for DirectX 10. Honestly, it was time to see how far the various vendors had come since release in providing decent driver or game support. 64-bit OSes are also the future - after all, AMD released x86-64 on the world over three years ago. We collected enough information to generate a weekend short story on the subject but as we feared, progress has been slow.

NVIDIA released their first decent set of Vista drivers this last week and we are busy redoing all of our 8800GTS/GTX numbers for the P35 launch article. In the meantime, we chewed through four different driver releases from AMD and decided to stick with the publicly released drivers for this article. We generated some really impressive 3DMark numbers with the alpha drivers but let's just say when it came time to using actual applications those drivers were not always stable or feature capable. We did receive a new set of beta 8.38 drivers a couple of days ago and those are in testing but we do not have enough experience with them yet to publish meaningful numbers.

You might notice in our game testing that several of the more popular games are not benchmarked. We had screen corruption issues in Oblivion, S.T.A.L.K.E.R., Half-Life 2: Episode One, and even Sims 2 when utilizing CrossFire. These same issues are not evident under Windows XP so we contribute most of the issues to driver maturity, though several games we tried are also having some minor issues with XP as well. Also, our Battlefield 2142, Flight Simulator X, and Half-Life 2: Lost Coast benchmarks would not run consistently under Vista so we are back to the drawing board on those and a couple of other games.

As for providing current DX10 benchmarks from the upcoming Lost Planet and Call of Juarez games we decided it was best to wait on the next driver release before providing results as any scores generated now are basically useless. When running CrossFire with the R600 each demo has problems with rendering, tearing, jitters, and several other issues that are likely to be fixed shortly. Needless to say, our first experiences with DX10 and the R600 were not pleasant.

Index General Graphics Performance
Comments Locked


View All Comments

  • wjmbsd - Tuesday, July 10, 2007 - link

    Are there any benchmarks out there yet for the HD 2900 XT from Diamond (the $499 version w/ 1GB of DDR4)??? Anyone know when to expect to see some? Diamond says this is "The World's Fastest Graphics Card" and I was told by Maingear that the 1GB version of this card is much faster than even the Nvidia 8800 Ultra, at a fraction of the cost.
  • lopri - Thursday, May 17, 2007 - link


    In our more strenuous graphics test utilizing 3DMark06 we find the P35 results once again leads the 975X chipset but the margin of difference is a negligible 1~2%. We decided to see why the results were so close in this particular test. We looked over the results and found in the SM2.0 tests the P35 solution was about 2% behind the 975X scores, the P35 CPU score was slightly better, and the HDR/SM3.0 tests showed a 4% advantage for the P35. Since the HDR/SM3.0 tests heavily stress both the CPU and graphics bus we figured the x4 PCI Express lane limitation would cause a bottleneck in this test.

  • Verdant - Thursday, May 17, 2007 - link

    Thanks for including the RTS scores; they are really the only games I play.

    This sentence doesn't seem to work grammatically:

    There is a significant amount of smoke, explosions, and vehicle usage as this a very GPU intensive Battlefield 2 benchmark.
    (pg 4)
  • TA152H - Friday, May 18, 2007 - link

    The choice of words is fine, it's just not divided in a clear way.

    Add a comma after "usage" and the meaning is a lot clearer. I agree with you that it could have been worded a little more clearly, just replacing "as" with "making" would have done it. Even without changing the words, by moving vehicle usage first, it would have added clarity since it is a phrase, and smoke and explosions both are words, making the seperation a little more distinct. But, that's kind of nit-picking, isn't it (not that I'm above nit-picking, I just try to act like I am)?
  • TA152H - Friday, May 18, 2007 - link

    Ugggh, "as" would have to be replaced with "making it", not "making".
  • TA152H - Friday, May 18, 2007 - link

    Nevermind, why isn't there an edit button or delete button so I can delete idiotic posts of mine like the previous one?
  • BLHealthy4life - Thursday, May 17, 2007 - link

    What has ATI been doing all of these months?? Sure as hell hasn't been taking Nvidia seriously.

    Nvidia has to be pointing its finger at ATI, calling it a loser, and laughing its ass off...

  • crimson117 - Thursday, May 17, 2007 - link


    "We are not here to single handily knock AMD"

    should be

    "We are not here to single-handedly knock AMD"

    Source: http://www.thefreedictionary.com/single-handedly">http://www.thefreedictionary.com/single-handedly
  • vijay333 - Thursday, May 17, 2007 - link

    completely OT, but it seems it is anal-retentive and not anal retentive.

  • nicolasb - Thursday, May 17, 2007 - link

    When exactly are we expecting X38, anyway? Does "this summer" mean "July", or is it just another way of saying "Q3"?

Log in

Don't have an account? Sign up now