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#1
June 17th 12, 10:05 AM
posted to comp.sys.intel
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Ivy Bridge i5-3570K without rdrand
Installed i5-3570K into GA-Z68MA-D2H-B3 mobo. I am not getting the
RDRAND feature! The rdrand instruction results in "illegal opcode". Looking at the feature vector of the cpuid instruction reveals rdrand as absent. $ cpuid eax in eax ebx ecx edx 00000000 0000000d 756e6547 6c65746e 49656e69 00000001 000306a9 06100800 3f9ae3bf bfebfbff ^ Bit 30 (counting from zero) of ecx will indicate presence of rdrand according to http://www.intel.com/Assets/PDF/appnote/241618.pdf. Any ideas? - Bad processor with disabled execution unit - Bad microcode from mobo - This particular processor does not have it? 
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