Vista - Computer randomly restarts during Games

I have just bought a new computer with the following specs
3.00 Ghz Intel core 2 Duo
ATI Radeon HD3870X2
4gb DDR3 Ram
500gb Hard driver
Asus P5E3 Mobo
650W Power Supply
Windows Vista 64 bit

The while playing games such as Call of Duty 4 and World in Conflict I can play for about 5 mins to 30 mins then my computer would randomly shut off and restart.
The weird thing is that it plays fine in other games like Crysis on high graphisc and I can play for hours and have no problems.
The CPU tempearature is about 50-60C while playing and the GPU is about 70-80
Does anyone know what the problem may be?
Thanks

In article <e0ba06ca61c75df1753a25236718b101@xxxxxx-gateway.com>,
dominati0n <guest@xxxxxx-email.com> wrote:Since it doesn't appear to be heat it must be power. Replace
the power supply with a quality unit. But power supplies like you buy
grapefruit: look for the heaviest one on the shelf.

It sounds like heating in one of the components. The gpu temp sounds higher
than it needs to be. I take it that you are not overclocking? I would take
a good look at the DDR3. Do you have heat sinks installed on them? Are you
using a thermally advantaged case? What is the make and model of the
computer? What is the cpu model? E6xxx or E9xxx?

"dominati0n" <guest@xxxxxx-email.com> wrote in message
news:e0ba06ca61c75df1753a25236718b101@xxxxxx-gateway.com...

In article <02AF1AA7-3154-4759-8544-85B63EA40AEB@xxxxxx>,
Colin Barnhorst <c.barnhorst@xxxxxx> wrote:60-80 is high but the card should be able to run at 90 before
crapping out. You have a good point about the ram though, ram heatsinks
would be a cheap fix to try.

What should your GPU tempearature be when playing intense Graphic games?
I have an E8400 CPU and heatsinks came with the ram when i bought it. Although is kinda warm when I touch it.

In article <6a64ecc856497b0cf79c8650f70ec802@xxxxxx-gateway.com>,
dominati0n <guest@xxxxxx-email.com> wrote:<80 is fine. Nvidia GPU's are spec'd to run at something like 120c

Assumed correction: But power supplies like....... = BuY power supplies
like......

"the wharf rat" <wrat@xxxxxx> wrote in message
news:g3shou$rqa$1@xxxxxx
In article <e0ba06ca61c75df1753a25236718b101@xxxxxx-gateway.com>,
dominati0n <guest@xxxxxx-email.com> wrote:Since it doesn't appear to be heat it must be power. Replace
the power supply with a quality unit. But power supplies like you buy
grapefruit: look for the heaviest one on the shelf.

I don't think it is a hardware issue because it doesnt crash in other games ike Crysis which is a lot more graphic intense. It is in only a few games

Please make sure you have the latest version of DirectX installed on your
machine,as well as the latest version of video drivers for your graphics
card.

"dominati0n" <guest@xxxxxx-email.com> wrote in message
news:961dc114ae1a1c6c676735a9e7b2ac3a@xxxxxx-gateway.com...

I don't think it is a hardware issue because it doesnt crash in other
games ike Crysis which is a lot more graphic intense. It is in only a
few games


--
dominati0n

On Wed, 25 Jun 2008 22:31:49 -0500, dominati0n
<guest@xxxxxx-email.com> wrote:
Then look to those few games as the problem.