Asus advertised the P5B Deluxe as an ATI Crossfire certified system. What's rather interesting is the ability to also run an SLI setup, with of course modded display driver. The best scenario is to have a 975X motherboard, since it has 2x16x PCI-E, while the 965 chipset has 1x16x and 1x4x PCI-E slots.

In any case, the following test results are only for evaluation since drivers are rather "old", at version 85.96. Remember, you need a SLI bridge to maximize performance and set the BIOS under SouthBridge chipset settings, 4x (FAST) for the second (blue) PCI-E slot.

After removing 93.71 forceware, we installed the newly downloaded 85.96. A possible issue is that you won't have support for the newly released games. There are two solutions for this, either create them yourself, or download nhancer and this file. You will have all the latest available SLI profiles on your system without any worries.

The modified SLi driver warns us that it is un-official:

Tick both boxes to get SLi working:

All tests were done with two Nvidia reference 7900GS boards. Below are the test results with the latest available drivers (93.71) and the modded (85.96) driver. As you can see, SLI does work, except for Prey, where despite all our attempts, the game crashed...