>>>>> "Martin" == Martin Jungowski <jungowsk@in.tum.de> writes: Martin> These registers are also known as Martin> additional SSE-Registers, hence the CPU does not support SSE2 Martin> in 32-bit mode but in 64-bit only. No, it does support sse2 in (both) 32bit mode(s). It just can use twice as many xmm registers in long mode (64bit mode), just like it can use twice as many general purpose registers. -JimC