Computer lags randomly during gameplay

March 30, 2011 at 07:39:33
Specs: Windows 7

About every 5 minutes I play any newer game, my computer lags for about 2-3 minutes, and then runs smoothly again. The lag reduces framerate to less than 1/sec. It's all very weird, for instance, it happens in Fallout: New Vegas, and Civilizations 5, but not Heroes of Might and Magic 3.
The computer does not make any unusual sounds during this, except the fan spins a bit louder, as I guess it's working hard to keep up what ever trickery it's trying to do.

It started when I reformatted my computer, and upgraded from Vista to Windows 7 (through deleting vista, and installing windows 7, not by upgrading), before that, there were no problems.

My spec:
Motherboard: abit Fatal1ty FP-IN9 SLI
Graphic card: NVIDIA GeForce 9600 GT
Processor: Intel Core 2 Duo
Memory: 8GB RAM

Here is a list of things I've currently tried with no result:
Changing settings in the games from high to low to high
Deleting the graphic card driver, and reinstalling it.
Changing settings in the NVIDIA controller, such as, disabling anti-alias, setting all settings to low, or disabling what ever was possible.
Tried various patches for the games themselves.

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March 30, 2011 at 08:20:52
Online games or stand alone? Have you checked to see if any backgroung apps are causing the lag?

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March 30, 2011 at 08:55:12
It's all stand alone, no online gaming. I have checked to see if any programs could interfere, but I can't see what that should be. The computer is newly formated, so there are only the basic windows 7 applications, steam and avast! anti-virus. Closing the 2 last is making no difference (as expected).
When I check the task manager performance tab, there are no other heavy programs running, apart from the game, nor is there if I alt tab during the lag.

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April 1, 2011 at 06:35:05
I reinstalled my chipset driver (nForce 650i), and tried loading my bios with fail-safe defaults. Alas, no difference.

No one has any idea what could be wrong?

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Related Solutions

April 4, 2011 at 10:08:04
I finally made a breakthrough. It turns out my 9600 GT heats to over 110 degrees celcius!

I tried getting fan-control software, Nvidia's own nTune, RivaTurner, speedfan, but apparently, the 9600 GT cannot be manually controlled. What do I do? I'm guessing Windows 7 must have changed something fundamental because the fan doesn't seem to cool the card properly. It doesn't make any noise anymore, and it spins so slow I can almost count the spins.

What do I do?

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April 4, 2011 at 13:14:16
Add more case fans?

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April 10, 2011 at 23:06:42
I'm having the same problem...I just bought the game today and there's a HORRIBLE lag once I have the option to customize my character.
I REALLY don't want to return this game! TT~TT

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April 11, 2011 at 01:44:59
I managed to solve the problem now, as suggested by jdfry, I replaced the 9600GT fan with an awesome Zalman VF900-CU. Not only did it solve my problem, it also reduced noise and increased the GPU speed, due to better cooling.

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