Upgrade Celeron D to a Pentium D = CRASH

MOBO: Gigabyte 8I865GME-775
RAM: 1g kingston dual channel 400mhz
PSU: tHERMALTAKE 500W W0120
full psu specs at this link: http://www.thermaltakeusa.com/produc...0120/w0120.asp
HD: WD 120 GB / WD1200JB-00GVA0
OS: XP SP2
Display card: NVIDIA GeForce 7600 GS AGP

Okay here's my issue I built this PC about 9 months ago.
My original cpu was a Celeron D 351 3.20Ghz, it was slow
This pc was stable, never had a single crash or reboot, during the many many hours of use.


Yesterday I installed a Pentium D 935 dual core Presler 3.2GHz.
Wanted to speed things up a bit, found a good price at newegg.
My pc booted up fine, recognized the new cpu and loaded xp (sp2)
but....
I started getting random reboots and lockups. Sometimes within 2min other times a few hours..

After the first reboot I started using a program to watch the cpu temps, I never saw it above 41c


So what could the reboots be from?
Would the CPU upgrade draw more power and make the psu fail?

I used Prime95 and other stress test programs to heat things up, things ran fine (only tested for an hour)
Ram was tested with memt86 or whatever it's called?

I've used software like speedfan to watch everything,
Things looked perfect, temps, voltage, etc.

I even touched the CPU Heatsink after some of the crashes and it seemed normal, everything seem to be within it's normal temp range. I know what a cooked cpu feels like.
And I'm using the correct Bios
but I went ahead and tried all recent versions.

Maybe this CPU didn't like my slower dual channel ram?


I'm stumped

Are you sure your MOBO is compatible?

Yes it's posted on the gigabyte website, and they wrote me confirming that it was.

Perhaps it is DOA, just a bad CPU. Iv seen computers do un-explainable things, theres SOOOO much that goes on inside these CPUs its really hard to troubleshoot problems with them.