Sudden FPS drop on every games

When I play any games, the FPS drop time-by-time. Like when I play Crysis for 20-30 fps but it will suddenly drop to 8-15 fps, back to normal after several minutes, fps drop again after several minutes, and so on...

I already kill everything I can in the background like AVG and Aero, I even disable Desktop Windows Manager.

It's a recent issue and everything is up to date. But the problem just came out suddenly.

Windows Vista Home Premium SP2 32-bit

Intel Core 2 Duo E8400 3.0GHz

2GB DDR2 RAM

Geforce 8600GS 512MB

EDIT: It drops a maximum of 20 fps, but never drop until 8 fps. Weird.

your GPU is not good enough for Crysis to run smooth, thats a fact,and you probably a bit low in RAM amount. but if you give the res and settings you use for crysis and other gamesit would help.

My computer is already one year and I have no problem with it.

As for Crysis I can run Medium @ 800 x 600, DX9.

As I said, this is a recent issue.

My computer is already one year and I have no problem with it.

As for Crysis I can run Medium @ 800 x 600, DX9.

As I said, this is a recent issue.

PeterTechGuy

It might be a overheating issue. Try cleaning the PC and make sure i has enough airflow.rronqe

This is my though too, Definitely sounds like an overheating problem.

Checked, everthing is fine. All the settings was set to default factory settings. But problem still exist.

EDIT: It just happen suddenly and I don't know why. Tested with overclocked and underclocked CPU & GPU, same result. :(