I second that. A64 is really strong in game so lower cas shouldnt help much..(educated guess...)so having 1 gig will improve your video encoding or any other memory hungry progz...
Asus P4P800DX, P4C 2.6ghz@3.25ghz, 2X512 OCZ PC4000 3-3-3-8, Leadtek FX5900@450/875, 2X30gig Raid0