AMD prices as of Feb 13 reflects the Opteron as cheaper in some cases...
An Opteron 165 for $278 - A X2-3800 for $301
An Opteron 170 for $367 - A X2-4200 for $362
An Opteron 175 for $475 - A X2-4400 for $467
An Opteron 185 for $637 - A X2-4800 for $643
FX-60 for $1031
FX-57 for $827
An Opteron 170 (apparently the best Opteron overclocker) will overclock in most cases to just under 3GHz, which is the same as the FX-60 will do, but it costs more than $600 less...
Take notes if you must...
http://wiki.extremeoverclocking.com/wiki/Opteron_Steppings#Stepping_Info
http://www.amd.com/us-en/Corporate/VirtualPressRoom/0,,51_104_609,00.html
An Opteron 165 for $278 - A X2-3800 for $301
An Opteron 170 for $367 - A X2-4200 for $362
An Opteron 175 for $475 - A X2-4400 for $467
An Opteron 185 for $637 - A X2-4800 for $643
FX-60 for $1031
FX-57 for $827
An Opteron 170 (apparently the best Opteron overclocker) will overclock in most cases to just under 3GHz, which is the same as the FX-60 will do, but it costs more than $600 less...
Take notes if you must...
http://wiki.extremeoverclocking.com/wiki/Opteron_Steppings#Stepping_Info
http://www.amd.com/us-en/Corporate/VirtualPressRoom/0,,51_104_609,00.html