[Mauzen]

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Originally Posted by XStreeter Yeah i think there is the problem. and can you tell me my first procesor was 1 core this is new model and 2 core. in games i dont see any change of fps. I need to format pc or should change anything ? ThanksPlease give me the last answer

I recommend not using the CPU until you applied the thermal paste, temperatures over 70°c drastically reduce electronic part's lifetime, and in case you try to play something for a longer period of time your fun with the new CPU might end pretty soon.

I use to reinstall windows every time after switching major components, though its not required anymore since Vista or Win 7. It might improve overall performance, but the main reason is that it keeps the OS clean, and this is enough to make it feel faster.
Going from a single core CPU to dual core is a big difference. Even though not every game profits from that youll definitely enjoy it.