AMD X2 4200+ or Opteron 170 ?

[AhoyCpu]

Im doing one last upgrade to my 939 system. With my $200 budget I've narrowed it down to these 2 cpu. Which one should I get?

 

[1Tanker]

Im doing one last upgrade to my 939 system. With my $200 budget I've narrowed it down to these 2 cpu. Which one should I get?

Get the Opty. It's got 1MB L2 cache, and will overclock better than the 4200+. GL