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#1
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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? |
#2
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Ivy Bridge i5-3570K without rdrand
Mario Andretti wrote:
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. Bit 30 (counting from zero) of ecx will indicate presence of rdrand according to http://www.intel.com/Assets/PDF/appnote/241618.pdf. http://www.intel.com/content/dam/www...ion-update.pdf Errata (sheet 3 of 4), page 11 Number 54 The comment field is supposed to be clickable but didn't work for me, so jump to page 31 for the "BV54" section. No, I don't do assembly coding on IA-86/64 architecture nor do I have this processor and mobo setup. I just Google around and hope the above article addresses your concern. Yeah, I know your reaction will likely be "farking Intel, farking Gigabyte, won't work together, I'm screwed". |
#3
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Ivy Bridge i5-3570K without rdrand
Am 17.06.2012 19:14, schrieb VanguardLH:
http://www.intel.com/content/dam/www...ion-update.pdf Errata (sheet 3 of 4), page 11 Number 54 This points to a processor erratum fixable by a BIOS workaround. I have looked at Gigabyte, and, although not clearly visible, they do have a fresher BIOS. I was running f10c since about February, now they call it (just) f10. This indeed fixed the problem! Thanks for your help. |
#4
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Ivy Bridge i5-3570K without rdrand
VanguardLH wrote:
Mario Andretti wrote: 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. Bit 30 (counting from zero) of ecx will indicate presence of rdrand according to http://www.intel.com/Assets/PDF/appnote/241618.pdf. http://www.intel.com/content/dam/www...ion-update.pdf Errata (sheet 3 of 4), page 11 Number 54 The comment field is supposed to be clickable but didn't work for me, so jump to page 31 for the "BV54" section. Good catch, a fixable issue. No, I don't do assembly coding on IA-86/64 architecture nor do I have this processor and mobo setup. I just Google around and hope the above article addresses your concern. Yeah, I know your reaction will likely be "farking Intel, farking Gigabyte, won't work together, I'm screwed". |
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