finally had time to do some more testing...
put a evga 9400gt(1gig) pci graphics card into a phenom2 AM3 based system. previously i got ice storm lag with this card in 2 lower quality board/chips(as posted above).
used same vid card drivers and had no lag issues from multiple ice storms/dancing balls/fogs/blades.
conclusions... had nothing to do with latency, operating system, amount of ram(2 gig) but not quality of ram since this had to change, hard drive(used an old 7200rpm IDE. only things that varied greatly was cpu and motherboard.
btw fps varied between 30 and 110. tested in sin red alert zerging, shroud, reavers and tod. This with a simply horrible graphics card for gaming.