Yep as you guessed and the review said I have found that every game I play runs better on the A64 processor than on my older 32-bit processor.
I know the software and hardware out there right now doesn't have real 64-bit OS support (aside from Windows XP 64) but I have noticed increases in games and applications like Photoshop, Illustrator, Dreamweaver, etc...
On the motherboard side I went with a Gigabyte K8N Pro for my A64 system and haven't had any trouble out of it at all.