Help when OC'd the PC just shuts off

[SKy042]

On my x2 rig when I try running it overclocked it'll just randomly shut down.
Usually it happens under load specifcally while ripping DVD's

X2 4400+ 1.40Vcore when OC'd otherwise runs around 1.28
ECS KN1 Exteme NF4 Ultra Mobo
Overclocked setting is 2.4Ghz(218FSB)
G.Skill Extreme Series ZX 2GB (2x1GB) set to 2.5-3-2-5 when oc'd
temps are about 30C idle and about 46C 100% load.
XFX 7800GTX 256
4 PATA HDD's
2 SATA HDD's
2 DVD/RW drives(NEC 3540A)
3 120mm fans
2 80mm fans.
Powered by a Enermax LIberty 620 (replaced my old aspire 520 because of this whole shutting off thing)

When it happens the PC does not automatically reboot.
once I reboot and get back into windows the interval till the next shutdown seems to decrease.

If I run the system at stock specs it's stable for days at 100% load
Could it be the ECS mobo PWM's just not being able to handle the additional draw of the OC'd X2?
Could my PSU STILL not be powerful enough?
What could cause this problem?
Any other suggestions.

Also of note.
CnQ is turned off
So is CPU thermal throttling.
Vdimm is 2.63
and it's in a Thermaltake Armor va8000b
The rear case fan just above the PWM's is a Sunon 115CFM fam and the ECS mobo also has it's own little shroud for cooling the PWM's built in.
HTT Multiplier set for 4x
FSB 218
I think thats everything info wise.

 

[wetware_interface]

could it possibly be that you have hit the ceiling with your combination?
yep.

are you gonna get around that? not without spending some more $$.

i'd back down the speed to 210 and drop the v-core to default as it randomly locks up now and see how it does at load.
if it still locks up stay at 210 and raise v-core a smidge above stock and retest and only raise v-core a bit till you get 210 stable. if you have to boost v-core more than a tiny bit to get 210 most likely it's your cpu or heatsink holding you back.

also first place i'd start is cpu cooler (you didn't say what your using so i'm assuming stock and if so you did wipe that crap it came with off and apply some decent artic silver or equivalent paste right?). take it off, wipe it down, wipe down the cpu. re-apply thermal paste thinly and evenly after cleaning both the cpu and heatsink with alcohol. you may have had too much thermal compund between the top of the heat spreader on your cpu and the heatsinks bottom. reseat everything and don't overclock for a few days. then raise to 210 again at stock v-core. see if it's stable under load if not raise v-core a smidge at a time till it is. if you have a lower v-core now than what you needed earlier i'd go and get a different heatsink. wipe and clean run at stock speed/v-core again for a few days and then bump to v-core setting you got to 210 with and try 210 again. if stable under load bump speed till v-core needs to be raised again a smidge to be stable. and continue up the ladder till you have a solid o'c that is stable. don't just crank the voltage and try to run as fast as you can under that. small steps with voltage and test at that to see what you can get out of it. some cpus by the way don't have much headroom so don't expect everything you buy to be overclockable to huge leaps.

 

[KaptainBlaZzed]

I have an X2 3800+ @ 2.65 on my ECS A939 no problems, I just put a fan over the MOSFETS to keep the cool and have not had a problem yet.

I use this comp. for folding only, it has been at 100% load for a week now with no problems. The only problem i ran into was the the modo did not like to boot with the FSB>260 so i boot at 260 and use clockgen to set the speed. I have found the the voltage regualtion on my ECS is quite good, I think that it is juat as stable if not more stable that on my DFI.