Dual core : yes or no?

I've got around $315 tax refund coming at the end of this month, and I'm buying a new processor.  I'm leaning towards an Opteron, but should I spring for a dual-core, or not?

>>14
What so funny about that?

An overwhelming majority of computers are using single core processors.

It would only make sense that software written today is optimized for single core processors.

Starting with Vista they're optimizing for more efficient technology.

Multi-core architecture is the future, but single core processors will still be around for a few more years.