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Spontaneous Reboot Problems, Help?

Last response: in CPUs
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August 29, 2009 7:42:33 PM

I have a newly built system (a few months old):

Core2 Quad Q9400 2.66GHz
Gigabyte GA-EP45-UD3P mobo
Artic Cooling Freezer 7 Pro CPU Cooler
Cooler Master RC-690 Mid Tower Case
Cooler Master UCP RS700 700w power supply
Running Vista Ultimate

Can someone help me troubleshoot a spontaneous reboot problem? It occurs usually when I'm doing heavy data processing (using Stata, a statistics program). However, it doesn't appear to be a heat issue (monitoring using Gigabyte's EasyTune 6 while executing heavy statistics code, doesn't reveal temperatures above 100 F, yet it spontaneously shut down/reboots!

What else can cause this? Note: I have NOT overclocked or edited any CPU settings (that I know of).

Thanks for your insights!!
a b à CPUs
August 29, 2009 7:44:58 PM

Do you get a quick blue screen or does it just reboot?
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August 29, 2009 7:46:22 PM

Nope, no blue screen. Just an instantaneous reboot.
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a b à CPUs
August 29, 2009 7:54:29 PM

Do a load test with real temp and see what the temps say...

Make sure your ram is set up properly- timings and voltage to manufacturers specs

I would say a good majority of problems in regards to computer stability can be blamed on the ram if not properly setup.
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August 29, 2009 8:47:49 PM

Will do.
Where can I find the best BIOS settings for my ram?
I have 4 sticks of G.SKILL F2-6400CL5D-4GBPQ
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a b à CPUs
August 29, 2009 8:55:34 PM

You'll have to check your receipt/box for the timings/voltage.

If you don't have the specs you can always call the manufacturer and they will tell you.
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August 30, 2009 1:01:03 AM

Thought this would be a common config of a common mobo with common ram. Looking at the GSKILL forum, sounds like some tweaks are needed. I just want to be able to run 8GB of ram, stable, without overclocking. What happened to just plug and play ram?

I've run Memtest86 v2.11-- with all 4 sticks in I get errors beginning on Test 3. I am now testing 1 stick at a time in slot.
My timings using AUTO in BIOS match settings by GSKILL- 5-5-5-15, 1.8v-1.9v
Other suggestions?
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a b à CPUs
August 30, 2009 2:10:55 AM

use the rated timings and voltage for now, and set the northbridge to 1.4

Sometime you need a northbridge bump when using more than 4gb of ram
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August 30, 2009 3:09:31 AM

Now this is weird.

So I tested each stick separately in slot 1 with memtest 1 pass, all good.

Then I put all four back in, and I'm testing Memtest, at Test #5 (33% of 1 pass with ZERO errors). Maybe one of them was dislodged?

Is the Northbridge, the MCH Core setting to 1.4v?
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a b à CPUs
August 30, 2009 1:04:22 PM

Yes, try that out and check stability again. If that doesn't work, try upping the ram voltage 1 notch.
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!