MOBO: Gigabyte 8I865GME-775
RAM: 1g kingston dual channel
PSU: tHERMALTAKE 500W W0120
full psu specs at this link: http://www.thermaltakeusa.com/produ...

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 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. Sometime 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 Prim95 and other stress test programs to heat things up, things run 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 look perfect temps, etc. even down to the Voltage coming from the PSU.

I even touched the CPU Heatsink after some of the crashes and it seems normal, everything seem to be within it's normal temp
And I'm using the correct Bios but all versions have been tried.

I'm stumped

Computacating

Did you try updating the Bios?

AMD Athlon 64 X2 4400+ OC 2.7ghz
4GB Dual Channel DDR 3200
Nvidia 7900GT
SATA II 2x 320gig 7200rpm 16mb cache RAID-0+1
Gigabyte Nforce 4 SLI

Yes, I even talked to gigabyte about this.
They suggested bios F4 which is what I'm using.
I've tried all recent version from them too,

None seemed to help.

Computacating

So this didn't happen at all until you installed another cpu?

what are your psu specs. ATX 1.0, ATX 2.0, what's amp rating on the 12v+ rail or rails depeneding upon tthe atx form factor?

Did the bios adjust the new cpu correctly in voltage?

Another thing you might want to check out if your psu specs are decent and your voltage is correct, is to make sure that you didn't bend any socket pins when you were installing the processor.

AMD Athlon 64 X2 4400+ OC 2.7ghz
4GB Dual Channel DDR 3200
Nvidia 7900GT
SATA II 2x 320gig 7200rpm 16mb cache RAID-0+1
Gigabyte Nforce 4 SLI

No, this started right after the upgrade, infact I put the celeron back in.

The other has an RMA and will be shiped out monday unless I find a cure all.

I wonder if that CPU didn't like my ram? It's some dual chips stock clock at 400mhz?

http://www.thermaltakeusa.com/produ...

That's my PSU specs, They seem good to me?
775 doesn't have pins to bend, It's the pinless cpu.

I could be wrong but I think the Voltage is the same for these two cpus.

Computacating

It's working now with the Celeron correct? Then it's not the kingston ram or else it would cause this problem regardless of the cpu due to the fact that your motherboard wasn't tested for use with that ram which would have resulted in the motherboard becoming unstable.

Your ram should be fine it sounds like you have DDR 400 which runs nsyc with the Cpu's 800mhz FSB due to intels quad pumped technology.

This link explains.

http://www.hardwareanalysis.com/con...

It's a good psu so no worries there.

The Intel LGA775 board has something very simliar to cpu pins called socket contacts on the socket which can bend just as easily as cpu pins, as shown here.

http://www.intel.com/cd/channel/res...

So you elminated a lot of things that it could have been. If it has worked fine with the Celeron in there then we know it's not the psu, it's not the ram, it's not a bent pin on the socket, it's not overheating and you have the lastest bios update.

It could very well be that you got a bad cpu. Was it retail or was it an OEM?

AMD Athlon 64 X2 4400+ OC 2.7ghz
4GB Dual Channel DDR 3200
Nvidia 7900GT
SATA II 2x 320gig 7200rpm 16mb cache RAID-0+1
Gigabyte Nforce 4 SLI

It's working fine now, never a lockup or crash with the celeron. I'm using it now to type you..

It was a Retail from Newegg.
I'm Shipping it out Monday for a refund.
I will try upgrading one more time, but I'm wondering if I should try a different chip version. There is a few to choose from.

Thanks for your logic, I just want to make sure I'm not over looking something obvious

Computacating

well it looks like they have tested your motherboard up to an Intel P4 940(3.2GHz,4MB) 800 so you may want to try that.

newegg doesn't have it but tigerdirect does for 110 dollars.

http://www.tigerdirect.com/applicat...

AMD Athlon 64 X2 4400+ OC 2.7ghz
4GB Dual Channel DDR 3200
Nvidia 7900GT
SATA II 2x 320gig 7200rpm 16mb cache RAID-0+1
Gigabyte Nforce 4 SLI