I have an AMD Phenom II X4 945 3GHz Processor and a Gigabyte MA790FXT-UD5P motherboard.

in the bios, the processor is "auto" set to 3.2GHz
windows recognizes it as 3GHz
on my newegg order, and on the box, the processor says its Socket AM3

My windows experience score for the processor is a 3.6 (while a friend has a score of a 5.9 on a AMD dual core 3GHz)
according to CPU-Z, my processor is Socket AM2+ (940) and that my core speed is ~800MHz

This 800MHz speed remains the same whether "Cool n Quiet" is enabled or disabled in the bios. (Cool n Quiet works well on a friends computer, dropping his core speed to 1GHz when his computer is idle, and bringing it up to 3GHz when the processing power is needed.)

On gigabyte's website, it says that this motherboard is not compatible with socket AM2+, and that it only works with AM3, which is why I specifically chose the one that was AM3.

Processor: (Newegg.com - AMD Phenom II X4 945 Deneb 3.0GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM3 125W Quad-Core Processor - Processors - Desktops)
Motherboard: (GIGABYTE - Support&Download - Motherboard - BIOS - GA-MA790FXT-UD5P (rev. 1.0))
CPU-Z freeware: (CPUID)