I have about the same rig
p5q pro / q9450 c1 @ 3680.5 *460fsb / asus hd4850 / gskill pc1000 8G's using air thermaltake 120 extreme
Everything is on auto except cpu v = 1.2675 & pcie = 100
every thing else is left on default settings virtualization / c1e ...... etc
prime stable / hits...
you should check your ram. because the biggest problem with overclocking this board is it always defaults to 800 mhz ram speed if your ram is capable.
So if you are set a 667 and 800 doesn't work your ram is probably not 800
heres a great overcolacking thread for this board...
I had the same problem
try disconnecting the dvd drive for some reason they don't work with ahci.
you also might try running the dvd on the unused controller. I just switched to a ide dvd drive i had.
and every thing worked fine
good luck
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