Core i7 920 shows 1 core 1 thread in CPU-Z

Hey ya'll, I just got my new hardware setup and it doesn't seem as fast as I would expect when I upgraded from a Athlon 64 3700+. So I go grab the latest version of CPU-Z (1.51) and notice it says Cores: 1, Threads: 1. When I go to Tomshardware and check out one of his core i7 overclocking guides I see his CPU-Z says Cores: 4, Threads: 8 and all of his cache data is 4x whatever kilobytes... Is my CPU only using 1 core?

I tried changing the Active processor cores settings in the BIOS from ALL to 2 but that changed nothing except everest then said I had a dual core but CPU-Z says 1 core regardless of the setting. Windows device manager shows 8 processors... Anyone have any thoughts on this? Thanks!

No, I was hoping I would not have to.... or is there a way to do it without losing everything?

you have to reinstall windows for it to recognize all 4 cores. I had to even when using the same mb to go from a 3700+ to a 4200 x2.

Windows is using the "ACPI Uniprocessor PC" Hardware Abstraction Layer because your old CPU was a single-core. You must re-install Windows when changing processors that have different thread counts, especially when going from a single thread to more than one thread. I think there is a way to "re-install" the HAL so that it detects the correct type, but it could screw your system.

Open task manager and check performance tab. If You have 8 cpu graphs there then it is working as it should and it is bug in cpuz that it shows one. If only one graph in task manager I am afraid You will need to reinstall.