Here is mine, FPO Q746A513.
It can do 8*480MHz (3.85GHz) @ 1.272V, tough on the screen its 1.288V but now at this moment I am running prime again with 1.272V...

Its a shame, I wasnt able to stabilize 8*500MHz, even with 1.368V under load, which is 1.384V idle, from BIOS 1.4250 coz' if vdrop...
I didnt want to push it more...

I also raised NB voltage to 1.55V, no help, SB to 1.60V no help...
WinXP loads up fine, AND IF CAN GET to desktop I can run Prmie95 or ORTHOS for gours, no error, no freeze, temp max 65 celsius, SEEMS fine...

BUT after a reboot, 3 out of 5 times when login screen comes up, i type my password, hit enter, and it stops there! Doesnt lock up, just slows down... it takes about 3 mins to get to desktop, but I can only see background, no start menu no icons...
Mouse still works, num-lock led active, so its not frozen but still, something wrong....
Could be this my mobo...? Cant handle 4GHz OR its my CPU...
As u can see it handles 8*480 absolutely stabel, 12+ prime95 small fft's test ran fine...
Any idea?