particularly with respect to processor topology identification. The big Intel manuals tend to lag behind the Intel ISA document, available at the top of this page, which is updated even for processors not yet publicly available, and thus usually contains more CPUID bits. For example, as of this writing, the ISA book (at revision 19, dated May 2014) documents the CLFLUSHOPT bit in leaf 7, but the big manuals although apparently more up-to-date (at revision 51, dated June 2014) don't mention it. AMD64 Architecture Programmer’s Manual Volume 3: General-Purpose and System Instructions cpuid command-line program for Linux cpuprint.com, cpuprint.exe, cpuprint.raw command-line programs for Windows instlatx64 - collection of x86/x64 Instruction Latency, Memory Latency and CPUID dumps X86 architecture Machine code X86 instructions