Originally Posted by
James Thorburn
It means it's 'prime stable'. It does not however guarentee that you'll never experience an overclocking related crash.
No single application is going to test every path on the processor, or every single instruction in the x86 ISA. For example Prime95 is purely 32-bit, so it won't be testing 64-bit logic. Likewise I doubt it uses SSE3, let alone the SSSE3 extensions found in Core microarchitecture chips.
Prime95 is a good general stability test, but you'll need to be aware that just because it doesn't fail doesn't mean that nothing will.