I've already got 2Gb of Ram, and I was gobsmacked at how badly NIS 2007 affected it. AVG is much, much better in the boot-up, although the scan is quite slow - about 1hr 40m currently (but that's scanning 2 x 250Gb HDDs, one internal and one external, about 350Gb of Progs and data total).

Is that good or bad? I have no way of knowing.

The updates are far better IMO, much more frequent than NIS, much faster running in background, and don't seem to degrade the performance of whatever foreground job I'm doing quite so much.