A quick one - what's beefier for folding:

E1200 @ 2666 0,5 MB cache
or
C2D 6300 @ 2333 2 MB cache (actually it's a Xeon 3040 but it's just different name)

My crappy mobo's max FSB is 333 so Xeon's OC potential is wasted here :/

So, better go with slightly higher clock or 4 x bigger cache?

Go faster, the cache isn't really going to matter much.

Agreed.

Thanks for your answers.

I've just sold both CPUs and right now the 2nd PC is using a mighty single core Celeron 420 @ 2,66 (clocks like maddd, does 3,2 on another mobo, with only a slight voltage bump).

I'll be getting E3200 soon. 45nm does make a difference in terms of power, and its price is a joke.