GPU Jumps & Frame Drops

u did

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Jul 6, 2014
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Hello, I've noticed while playing video games, recently Slender: The Arrival & COD: Bo2, the game will run smoothly for maybe 10 minutes, but then suddenly my frame rates will drop exceedingly for about 1 minute then return to normal. (Also, I run these games on low or medium settings).

I'm not sure what is causing this and trying to see what is going on, I ran GPU-Z and noticed that while normally playing,without frame drops, my GPU Core Clock/Memory Clocks are both high & my GPU load is at about 50%.

However once the frame rates drop, the GPU Clock/Memory Clock are at the lowest points and the GPU load is at 99%.

My Specs:
Intel Core i7-2630QM CPU @ 2.00GHz
8GB RAM
Nvidia GeForce GTX 580M
Win 7

Anyone have any idea what's going on/why? And any possible solutions?