It looks like BIOS 0508 and 0406 are not so good on cpu fan control. The noise level is still high when you choose optimal fan speed and I cannot use Asus AiBooster to check. I downgrade BIOS to 0301, AiBooster is back to normal and fan is quiet(same as initial BIOS 0128)...
I can go to FSB 245 with 116mhz PCI-E , thanks to your info. Previously I can go 10% overclocking only without changing PCI-E freq.
But I have difficulty to go beyond 245, system is not stable. I use 118mhz PCI-E, vcore is 1.35V.
Must I upgrade BIOS to 0406? can I continue up PCI-E freq? I...