I was wondering, I just build a system with these specs but was wondering if I would be better off with the Intel i3 530, Frys has it on sale for about $130; of course I'll have to get ddr3, I can still return the phenom and gigabyte and memory as they were purchased less than two weeks ago.
AMD Phenom II x4 945
Gigabyte GAMA78LMS2 Motherboard
4 Gb Patriot memory DDR2
500 GB Hitachi hard disk
I can see only one reason for anyone to change from that X4 to the i3 and that's if you're using a lot of encryption/decryption with an i3 supported encryption format... AES-256 ? (this is applicable if your disks are encrypted with bitlocker or truecrypt but not if you only occasionally encrypt a file like I describe below)
In all other cases I would prefer your X4 945 over any i3 or i5 6xx (it's difficult to recommend it over an i5 750 though).
I encrypted some files earlier this week using: 7zip, Windows 7 Professional 64-bit, Intel E8400, 4GB 800MHz memory, ... The files were image backups made after a fresh install of Windows 7 (I had to since I was still running Win 7RC). In the end I decided to use the fastest compression, just below the store option, the encryption algorithm was AES-256 and it did take ages: 8GB = 20 minutes (using normal compression), 12.5 GB = 25-30 minutes (using fastest compression algorithm) and it made clear why Intel has added support for encryption to their new processors.