Take a close look, All 4 cores are seen by windows XP x64 sp2, I changed the picture that I last linked to.The original retail Core 2 Duos were CPUID 6F6 (B2 stepping) and the retail QX6700 was a B3 stepping with a CPUID of 6F7. Your CPU has a CPUID of 6F5 (B1 stepping) so it's definitely an early Quad.
There is a program called i7 Turbo in the RealTemp 3.30 RC11 download. How many cores does it show for your CPU? I'm trying to decide if this is a unicode problem or something else.