I have two crossfired HD 6990s video cards and with three ASUS VE278Q monitors setup in Eyefinity configuration. The monitors are connected to video cards using three display port cables.
The monitors, video cards, and cable are all proven items from my prior build.
I have three following issues:
I cannot switch to the second BIOS via the BIOS button – this happens even on default BIOS settings.
Randomly disappearing USB 3.0 controllers – this happens even on default BIOS settings.
Code 00 cold boot problem if any CPU related performance options (clock, blck, etc) are set to any values other than defaults. As I had stated previously anything besides turbo=auto does not work regardless of memory settings or turbo ratio settings.
Root cause:
Disconnecting two of three display port cables resolves all three problems.
It does not matter which of the two cables I disconnect or which of the two video cards I use. I have tried every permutation of video cards, crossfire settings, cables, and monitors with exact same results.
I still think it is somehow related to the chipset, motherboard, or the BIOS. Bizarre issue…