Posted 01 April 2011 - 10:40 PM
I have no idea why something like this would happen. It might be reasonable if you had a x3 core Phenom that was showing up as x4. When processors are created, the ones with a single defective core are marked as x3, and the defective core is disabled.
Perhaps, and this is just a guess, your Athlon II Dual Core is actually an Athlon II x4 with two disabled cores after testing -- much like I spoke of the Phenom x3 coming from an x4. Perhaps the cores weren't properly disabled and have somehow reactivated -- and, further, windows has mistakenly labeled it a Phenom?
As to how to fix/change something like this -- I have no idea. I'd contact AMD about it and see what they say.