https://community.intel.com/t5/Mobile-and-Desktop-Processors/cpuid-functions-0Ah-and-0Bh-on-core-i7-2600/m-p/196841#M394 <P>Hello,</P><P>I just installed a core i7 2600 Sandy Bridge, and i am having problems with the cpuid instruction (works fine with a core i3 530 Clarkdale):</P><P></P><P>The cpuid functions 0Ah (Architectural Performance Monitor Features) and 0Bh (x2APIC Features/Processor topology) always reply with EAX=0 ans EBX=0.</P><P>The cpuid function 00h indicates a cpuid level of 0Dh.</P><P>Therefore, according to the document <A href="http://www.intel.com/assets/pdf/appnote/241618.pdf">http://www.intel.com/assets/pdf/appnote/241618.pdf</A> <A href="http://www.intel.com/assets/pdf/appnote/241618.pdf">http://www.intel.com/assets/pdf/appnote/241618.pdf</A> dated January 2011,the functions 0Ah and 0Bh should be operational.</P><P></P><P>Is this related to Sandy Bridge design, or could it be caused by the motherboard BIOS (Gigabyte GA-H67MA-D2H-B3 rev1.1-bios F4, running Windows Server 2008R2 SP1)?</P><P>I have not been able to locate any Intel documentation specifically related to Sandy Bridge cpuid behaviour.</P><P></P><P>Thank you in advance.</P> Fri, 22 Apr 2011 08:38:46 GMT idata 2011-04-22T08:38:46Z https://community.intel.com/t5/Mobile-and-Desktop-Processors/cpuid-functions-0Ah-and-0Bh-on-core-i7-2600/m-p/196841#M394 <P>Hello,</P><P>I just installed a core i7 2600 Sandy Bridge, and i am having problems with the cpuid instruction (works fine with a core i3 530 Clarkdale):</P><P></P><P>The cpuid functions 0Ah (Architectural Performance Monitor Features) and 0Bh (x2APIC Features/Processor topology) always reply with EAX=0 ans EBX=0.</P><P>The cpuid function 00h indicates a cpuid level of 0Dh.</P><P>Therefore, according to the document <A href="http://www.intel.com/assets/pdf/appnote/241618.pdf">http://www.intel.com/assets/pdf/appnote/241618.pdf</A> <A href="http://www.intel.com/assets/pdf/appnote/241618.pdf">http://www.intel.com/assets/pdf/appnote/241618.pdf</A> dated January 2011,the functions 0Ah and 0Bh should be operational.</P><P></P><P>Is this related to Sandy Bridge design, or could it be caused by the motherboard BIOS (Gigabyte GA-H67MA-D2H-B3 rev1.1-bios F4, running Windows Server 2008R2 SP1)?</P><P>I have not been able to locate any Intel documentation specifically related to Sandy Bridge cpuid behaviour.</P><P></P><P>Thank you in advance.</P> Fri, 22 Apr 2011 08:38:46 GMT https://community.intel.com/t5/Mobile-and-Desktop-Processors/cpuid-functions-0Ah-and-0Bh-on-core-i7-2600/m-p/196841#M394 idata 2011-04-22T08:38:46Z