8800GT PLEASE HELP!!

Hi all, i have just joined these forums because i'm totally stuck and maybe someone out there can help me

First things first this is my machine specs

Core Duo 2 E8200
POV 8800GT 512mb
4gig OCZ RAM 6400
Asus P5N-E SLI 650i Socket 775
2x 120gig Hard Drives
2 1048 x 768 Screens
700watt PSU

I have just upgraded the core components on my machine the other day, and all installed no problems at all, windows XP SP2 loaded on no problems as well. However i'm a gamer and have many titles i want to be playing. My old rig ran them all fine, just on crappy settings, so the upgrade was overdue.

I've installed all my games and the system is locking up on every game I try, especially Crysis and Supreme Commander! I don't even get very far, Crysis locks up in the ads for NVidia and Intel and SC locks in the pre game movie. I get a buzzing noise from the speakers when this occurs and i have to restart the system from the case.

First instinct was to update all possible drivers for sound card, gfx card, and flash my BIOS. All of which were fine. Ran the games again, same problem. I Read somewhere that XP might not cope with that much RAM so dropped to 2 gig, same problem still. Another source suggested i had an inadequate PSU, so i upgraded from 500watt to the one listed above, at extra cost and it's done nothing at all to help.

I've read about ...... tune, which i've installed and set my GPU fan at various speeds from 70 - 100% same problem, it idles at 47deg and has only been able to peak at 58deg before another lock up. So i would assume Heat isn't the issue here.

Another forum said to turn off any AI overclocking in the BIOS which i did, seemed

PLease can anyone suggest things for me, i was hoping on Monday for a whole week of hardcore gaming and i've had nothing but problems! I've spent alot of money on this so far and am at my witts end!

Ok i'll get you all the info i have, sorry i've not had to replace a PSU before so bought as high a wattage one as i could afford really

Sticker on the side says:

+3.3 - 30A
+ 5 - 38A
+12v1 - 22A
+12v2 - 22A
-12V - 0.6A
5vsb - 3A

please excuse my ignorance

Many thanks

How many cores did you have in the old system? You might need to reinstall XP, a repair install MIGHT work..

Your kidding right? 700w is more than enough. Though the rest of the statistics are very important.

First of all there is no OCZ RAM listed on the QVL for that motherboard which might be part of the problem.
http://www.asus.com/999/download/p [...] 474_10.pdf

Second I see a lot of info about your PSU but I don't see brand or model. As emp said wattage is really not a factor in choosing a PSU. A good quality 500-600 watt unit will out perform a low quality 700-800 unit.

Ok thanks, i shall download and run the memtest now, here's a link to my PSU that i've bought, hope it's ok...

http://www.ebuyer.com/product/124927

Ok thank you, can rule out one thing at least then

I had a similar problem with my new rig. Very much like your own.
It ended up being the Nvidia network management software. Uninstall it and then try it again.

I don't of course know if you've installed it, but you have the 650I motherboard and it comes standard with the motherboard drivers. So try it.

Hope this helps.

2 Modules in now and is running perfectly, am going for a 3rd.....

You can use Ntune, but it should also be in your MB bios.