AM7266-D upgrade help

Can anyone please suggest or give some advice regarding upgrading my ASUS
motherboard.

I currently have 2 AMD2400 MP chips. I want to move up to AMD3200.

Is using a single AMD3200 XP better than 2 AMD2400? Does the 2400 run like a
2.4GHz? If so, the 2800 runs like a 2.8GHz?

Should I just go to AMD2800 MP (dual)? Or some insights would be most helpful.

How much is the increase from a single AMD3200XP vs 2 AMD2800?

Otherwise I am considering a much more expensive dual Opteron. Am I correct
that the main difference between the AMD64 vs Opteron is that the Opteron has
the ability to run SMP (understanding that 100 series does not).

Basically what I want is about 2X increase in speed from my A7M266-D(dual) 2400
running at one Gig RAM. Or at least how much improvement can I get from a
single 3200 vs dual 2800?


Any thoughts are most appreciated.
Kip