bennicus

problem with invariant TSC on "Phenom II 965 Black edition" (maybe other models too)

Discussion created by bennicus on Jun 30, 2010
Latest reply on Jul 5, 2010 by avk

So... does this processor *actually* support invariant TSC or not?  I'm using CPUID 0x80000007 and checking EDX:8 for invariant TSC support and it returns that it does.  However the values I'm getting back from rdtsc definitely aren't invariant, they're jumping backwards and forwards all over the shop.  Is is falsely reporting invariant TSC support, or does "invariant TSC" mean something else on AMD processors? 

Cheers,

Ben

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