Is this worth an extra $50 (or thereabouts)?

AMD Athlon™64 4000+ CPU vs. AMD Athlon™64 X2 4200+ Dual-Core CPU.

Is this a no brainer? I’m shopping around and I found the latter for $50 more than the former.

I’ve also found an AMD Athlon™64 X2 3800+ Dual-Core CPU for $30 less than the 4000+. Does the dual-core make up for it being slower?

Yes.

No.

Get the 4200, or go up a step and get the one with more cache, can’t remember what clock speed that is. Go dual-core though if you want to future proof at all.

Alrighty. Thanks. :)