Building a new PC

[Piru]

Well the 6750 runs circles around the athlon, so you should. I'd also assume the 2gigs ram will be DDR2-800 or so, that will make the system even faster in comparison.

I upgraded from athlon xp 2400+ to E6320 @ 2.8GHz + 2GB DDR2-800 + SATA2 HDD, and the system is visibly say 2-3 times faster at least.

[Piru]

In directly CPU bound and multithreadable tasks you can expect quite a power boost:

Processor Arithmetic Benchmark from SiSoftware Sandra Lite (Win32 x86) 2008.1.12.30