AMDZone has posted up our review of the Athlon 64 X2 4000+ 65nm Brisbane core. We pit it against the 65nm 3600+ as well as the FX62. Can it stack up to the FX62 when overclocked?
Using some quick stock heatsink air cooling we got the chip to just over 3GHz, or about 100MHz less than we got the X2 3600+. Considering what the 65nm chips are clocking to this is pretty expected. Clearly you would want to pick up a 3600+ if possible, but at this point they are hard to come by, and the 4000+ 65nm is the next best to it.