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Strange CPU Usage drops

June 17, 2013 12:04:22 PM

Hi,

I'm having some very strange drops in my computers performance, even when just watching streams at twitch.tv. At first I thought I was my internet connection which was bad, but then I checked the load on my CPU which, when the stream lags, drops for about 15% or more?? My CPU's temp is at about 40 c.
Sometimes my computer even freezes for about 7 seconds and then makes a short "beep" through my speakers.

My specs are:

Intel Core i5-3570K 3.40 GHz
MSI Z77A-G45
Sapphire Vapor-x 7950 HD 3gb
2x4gb Corsair Vengeance 1600 MHz
Corsair Enthusiast TX650 V2

And for cooling I have a: Corsair H80i Hydro Series

I do also experience fps drops in games like "Batman: Arkham City", but I shook it off as being a problem with the Nvidia PhysX engine not being compatible with my AMD GPU?

I really hope there's someone who can help a computer rookie like me :D 

Thanks in advance
!