I have the 790i Ultra SLI mobo. I can OC my CPU just fine and have my Q9450 up to 3.2 Ghz at the moment. However, I am unable to OC my GPU's simultaneously. Is this because I don't have the EPP 2.0 supported memory? I have Kingston HyperX 4x1Gb. Using the nTune utility from nVidia, I am able to overclock GPU #1 but unable to touch GPU #2. SLI is enabled and I know it is because my frame rate doubles in Supreme Commander when I have SLI enabled. Any thoughts? Is it the memory?
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