Just for comparison:

AMD Phenom II X4
Bitcoin Version 0.3 (Win 32-bit)

Via WINE on Ubuntu 64-bit
4 cores - 2300 khash/s
3 cores - 1740 khash/s
2 cores - 1150 khash/s
1 core - 580 khash/s

Via 64-bit version
I hope this will come soon...

No coins got generated, yet. :-/