Yeah same problem here.
However yesterday before I have tried to O/C my Ph 9600 BE both CPU-z and OverDrive saw CPU as Quad but today I notice that one core is "missing" thus I have flush the BIOS with f7c version via @BIOS from Taiwan 1 server as none of others have any updated BIOS for my GA-MA790X-DS4 (Ver 1.0) motherboard.
After flash both CPC-z and O/D have seen only 3 cores.
8 hours later I was stuck with non responding PC (or better say the Blue screen was more often on the monitor than windows 7 Desktop.
After all this suffering I re-flashed the old BIOS (f5) back resulting in stable PC but Phenom beeing seen by both CPU-z abd OverDrive as 1 Core while W7's Device manager has shown "Processor" with four cores.
Here are specs of my PC : GA-MA790X-DS4, 4GB PC6400 DDR2, 1TB Seagate SATA, Pioneer SATA DVD, Phenom 9600 X4 BE with a good CPU Cooler (kept o/c temps bellow 45 C), 2 x GS7600 (nVidia), Pinnacle DVT and Creative X-Fi Xtreme.
I am puzzled as rudiger007