Looks like AMD realized that the overlocking kiddies were making a killing by buying these chips & oc'ing the crap out of them. Why buy that FX57 chip if you don't have to? Well, now you'll just have to rely on that 3700+ San Diego chip for your oc'ing needs..

"Reason: Opteron, a 1MB L2 cache processor was priced lower than Athlon 64 models with 512KB of L2 cache. Also, those Opteron babies were bad-boys when it comes to cooling, working at 2.7-2.9 GHz with air-cooling - at zero problems, with a lower operating temperature than default-clocked Pentium D 840."