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I do heavy web browsing with a lot of tabs also gaming and a lot of other things, if your PC hardware is not 100% stable your looking for trouble corrupted data to the storage drive or a crash of your web browser or games and other things. When you run prime95 it will also test the floating point of the CPU that is where the math is done and I don't like my PC not to calculate correctly. The new 28.9 prime95 also tests the AVX instruction set which is part of the floating point. A CPU is pure math calculations all you need when you overclock the core is pure math stress program and Prime95 can test and stress all the transistors in the CPU at the same time.