Is the GA-P35-DS3R stable at over 400FSB?

[VirtualLarry]

Having problems with my rig rebooting about once every day now.
E2140 @ 3.28Ghz 1.425v (BIOS) 8 x 410FSB
GA-P35-DS3R v1.0 F9 BIOS
2x2GB Patriot 5-5-5-12 ram, running 1.8v
HyperTX2 cooler
WD 320GB SATA HD
LG DVD burner

I had problems with it rebooting multiple times a day, so I upped the GMCH voltage +0.1v, and now it reboots less frequently, but it still does it. It doesn't reboot while just idling at the desktop, but it will if I run SeventeenOrBust in the background (a DC client, puts as much load as Prime95 does on the system, although even moreso on the memory bandwidth).

I'm curious, 1) What the default GMCH voltage is, and thus what +0.1v turns out to be, and 2) Who has their DS3Rs running at over 400FSB, and what are your settings? Thanks.

 

[VirtualLarry]

It turned out to be a bad UPS supplying bad power to the system. I dropped my GMCH voltage back down to default, and now the system is running just fine at 400FSB, plugged into the wall directly.