After a little more digging I discovered that this issue sometimes happens to Gigabyte P3x and P4x boards. It happens when replacing the processor or adding a new GPU or it can just happen out of the blue. And the great part is there is no solution to this problem.
After flashing just about every BIOS revision on the motherboard, and trying various settings I found that it will boot with host clock control enabled but only with Thermal monitor enabled which for some reason sets the multiplier to 6. I guess the motherboard and the GPU just don't play well...
That's just it, I can overclock to 3Ghz @1.25V with a 7750 instead of the 5870. It seems it's from the motherboard, as I've found similar cases were USB devices or video boards would cause the same issue.
I've recently bought a used 5870 to use for mining, and when I tried to OC my Q6600 I noticed that it doesn't even let me enable host clock control in BIOS, it just restarts with it disabled. I've been told it's the PSU but before I shell out 100$ on a new PSU I want to be sure.
Could it be...
A few days ago I flashed my 2400 XT and it stopped working. So I got my hands on a PCI video card and popped in a bootable cd with atiflash and the original BIOS on it, but when I tried to flash the card again I got this: Error 0FL01 adapter not found.
I tried various command lines with...
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