Need some help with power offs!

[Old&Slow_1]

Hi guys,
New to the forum. But not to O/Cing!
Have a weird power off problem that I can't seem to fix.
Tried AMDMB.com but no go there!
So here goes;
First off I am running my 2400+ at 2100 (10.5 x 200)
Solid as can be. Almost satisfied :)
I am using 1.825 volt on Vcore
Agp and mem are default.
I can boot and run at 2200 (11 x 200) no problem
However Prime will lock the system so I raise voltage to 1.850 and it locks again. Then to 1.875. This is where it happens. System completely powers off and so hard that I have to pull the plug to restart!! What's up with that?
I have an SK-6 on the CPU and it don't get to over 48 cel
Also the High temp is disabled in bios.
I also have a thing called thermal throttling and it's disabled.
Here's specs:

Case:Antec SX830 improved with 350watt Enermax
Motherboard: Epox 8RDA+ with C31 bios
CPU: AMD2400+@2100
Graphics:Radeon9500Pro 310/310
Memory: 2 X 256 Corsair PC3200
Hard drive: Seagate 80 gig
CDRom: 48X panasonic
FD: 1.44 panasonic
Network: Onboard
Sound: Onboard
Speakers: Klipsch 4.1
Monitor: Mag Innovision 810 FD
OS Window XP Pro
3DMark2001: 14198

Can someone help with this? Please.
bugging me something awful.
I bought a 350 watt Enemax to boost power from the 300 watt Antec and it dont do any good.

Thanx all.

[Mntsnow]

just out of curosity why not run the chip at it's default setting of 266 x 7.5 ? The Higher FSB will give you more performance than the higher multiplier. Then you wont have to push the voltages either.

But to answer your question I would maybe suspect that you are not getting accurate temp readings and the chip is infact overheating and on the verge of eating it's self.

[BBA]

I tend to agree with Mntsnow.