I know the P5N-D sucks 

Wondering how would I know if I need to raise voltage for NB and stuff, and what voltages to set them to. Currently only raised vcore and a vdimm for the rams (2x 2gb now at 1.9v,  5-5-5-18 for stability).

E8400 proc, at 3915 mhz (435x9) at 1.32volts-bios (1.25-1.26v on load) but when I leave OCCT on mix running for a few hours I come back and my pc is frozen. Same with prime95 on blend, though that froze in 15 minutes. Program didn't terminate or prompt error, but the screen is frozen. Only can push reset button 

However, the pc doesnt freeze when I do prime95 small fft for over an hour. And orthos doesnt freeze or return any errors too (so far 1 hour on priority 8).
What should I do? Memtest 1000%?
Raise vcore?
Anything else?

it could be anything for freeze..

could be vcore vs nb vs vtt vs mem voltages..

and it could even be cause one of them is overvolted etc...

recently a forumer came and asked me about my striker formula 2 clocks.. same i spent nearly a month with my e8400 on p35's and x38's so didnt take me long for the 780 board..
theres no clear define way or shortcuts... know thy board and then know that proc...

hi all sifus here, i am using asus p5k/epu board right now..
i want to ask how the epu work? it seem like cant work after i oc my processor.. but i do when use at stock setting..
anyone can utilize the epu yet after oc? or just a marketing strategies from asus...

As you can see above, my oc is stable @ 12hours of orthos, but my system will crash when playing a certain video files (not all), sometimes 20 minutes while playing, and sometimes just a few second and then crash. Hell I've played Crysis 3 hours straight and everthing was fine. The prob disappear when i switch to stock setting tho. I'm seeing stars now.. Is this mean that my oc isn't stable enough?

try it out with small FFT and check if it is stable,

ps:
if you are on air cooling your voltage is a bit high to run it 24/7

ehh... didnt see any ASUS P5K SE arround