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Catalyst 9.8 CrossFire: Is CrossFire Getting Better with Age?
George Ross, August 29, 2009

Introduction
Does the latest Catalyst 9.8 driver release from ATI's camp keep in ATI's recent trend of increasing CrossFire performance with each month's driver release, and is adding a third GPU worth the expense or hassle? We are going to be using the old 3.8GHz Deneb system to find out.

Test Hardware
I used the same setup that was used to test out the Catalyst 9.7 drivers. Here are some details.

Processor AMD Phenom II X4 940 Black Edition @ 3.8GHz
Motherboard FOXCONN A79A-S
Memory G.SKILL 4GB DDR2 1100 (PC2 8800) @ 533MHz (DDR 1066) 5-5-5-15 Dual Channel Mode
Hard Drive Seagate Barracuda ES.2 ST3250310NS 250GB 7200 RPM 32MB cache SATA 3.0Gb/s
Video Cards MSI Radeon HD 4890 @ 880 MHz core 999 MHz (3996 Gb/s) memory
Catalyst 9.8
MSI Radeon HD 4890 @ 880 MHz core 999 MHz (3996 Gb/s) memory
MSI Radeon HD 4890 @ 880 MHz core 999 MHz (3996 Gb/s) memory
Catalyst 9.8
MSI Radeon HD 4890 @ 880 MHz core 999 MHz (3996 Gb/s) memory
MSI Radeon HD 4890 @ 880 MHz core 999 MHz (3996 Gb/s) memory
MSI Radeon HD 4890 @ 880 MHz core 999 MHz (3996 Gb/s) memory
Catalyst 9.8
Optical Disk Drive Pioneer DVR-215DBK
Power Supply Rosewill Xtreme RX750-S-B 750W
Operating System Windows Vista Ultimate x64 SP1

Gaming Benchmarks
You may have noticed that I have changed the resolutions used for testing adding to the horizontal pixels.

When you add the second GPU to the mix it improves your 3D Mark 06 score by 18% and the third GPU yields a 22% improvement over the single GPU setup.

CrossFire has started working for Unreal Tournament III allowing for the two GPU setup to best the single GPU setup by 4% and the three GPU setup gives you 5% over the single GPU setup in overall average frame rates.

This is a first for me both CrossFired rigs outperformed the single card setup in overall average frame rates in Crysis. This improvement is a most welcome as Crysis is still very demanding even on high end systems. Good work ATI, but here is were it gets odd the three GPU setup gives you a 9% boost in frames and the two GPU setup gives you a slightly higher 10% boost in overall average frame rates.

Even in World in Conflict CrossFire has started to show signs of working having both the two and three GPU setups have a 2% lead over the single GPU setup in average frame rates.

Every game should react like Devil May Cry 4 does to multi-GPU setups. Going the two GPU route gives you a 86% performance enhancement and the three GPU setup rewards you with a 143% performance gain. Not that the single card setup needed improving upon for this game it is just nice to see CrossFire actually working well.

The two GPU setup had gives a 42% increase over the single GPU setup in overall average frames rates from all the games and the three GPU setup gives you a 68% increase over the single GPU setup. These numbers are better than they were with the Catalyst 9.7 tests.

Power Consumption
Of course the power bill is going up with each GPU you add.

Conclusion
This is the first time using CrossFire has yielded performance gains all across the board my test bed. It appears to me that positive steps in CrossFire performance are starting to be the norm at ATI. Still I wish the three GPU setup numbers were better. Here's to hoping ATI can keep up the good work.


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