Hi all,
I have lost 2 cores on my 965BE. I hadn't noticed, but it was pointed out to me via Futuremark and 3Dmark11 and SpikeSoprano from Overclockers Club forums.
Back in 2010 you had a thread about this issue and one guy said he reseated the CPU and it fixed the problem.
I'm going to do that and hope for the best.
Cheers .........

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Phenom11 X4 965BE C3 Watercooled. Asus M4N98TD evo. Evga GTX670FTW. 8G Corsair 1600XMS. Win7-64bit. 320+500 HDD.

make sure windows is set for 4 core use. i don't remember the actual settings but i think that is what was happening. also make sure you have the latest bios for the motherboard.

also you might check the cpu usage via amd overdrive

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gigabyte ga-ma790fxt-ud5p bios f8h,
cpu amd 965-c3 @4.0, silenX efz120ha4 cooler
8gigs patriot memory pgs34g1600llka (1333 cl7), xfx 6970 gpu, xfx 750w power supply.
windows 7 -64

I had flashed the BIOS from 1101 to 1301 and after five minutes of checking, I still had missing cores.
I was about to reinstall windows when I noticed that windows task manager had the four boxes back. The Flash fixed it and brought the AWOL cores home.

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Phenom11 X4 965BE C3 Watercooled. Asus M4N98TD evo. Evga GTX670FTW. 8G Corsair 1600XMS. Win7-64bit. 320+500 HDD.