Hi, recently I bought 2 6870 Radeon HD dual fan cards and Crossfired them using an intel i5 2500 CPU and ASUS P8P67LE Mobo. I am running 8GB Ram on a 64 bit operating system with 650w Thortec 80+ Gold Power supply.
I was told that AMD have better chipset support for Crossfiring because they dont limit the PCIe slots to x4 in crossfire mode instead of x16 in single GPU mode (not really sure what this means).
Can anyone give me a definitive answer as to whether I need to change to AMD CPU/Mobo to get better results?
Crossfiring with 1x PCIe x16 + 1x PCIe x4 are said to give some performance hit. But at mid-range GPU's this should not be too much. At least not worth to have a change of motherboard & processor specially since you already have the ideal gaming processor.
You can try a little experiment yourself by running 1 card vs 2 cards in crossfire & see the corresponding FPS in your favorite games.