|"my bro stupidly chanced the psu or cpu voltage to 2.0 volts when its only saposta run at 1.75"|
Did he go into the BIOS & play with the settings, then save them? That's the only way to jack up the CPU voltage. I don't know what you mean by "chanced the psu"?
The 2800+ runs at 1.65v, not 1.75v. If the voltage was increased to 2.0v, he may have damaged the CPU.
EDIT: I just had a look at the BIOS chapter for your board & unless I missed, I didn't see any way to change the CPU voltage.