just wondering if buy say 4 GB of GOOD ram will help out with gaming performance compared with 2GB of cheap stuff?
and would it help increase any 3dmark 06 score.
4 GB are much better than 2 GB for some games and it will continue more and more to make a great difference as new titles will comes out. I think that in about a year 2 GB will not be enough to run many games in Vista or Windows 7, in some cases they are barely enough now.
As for latencies and frequencies, no, it doesn't change so much to justify a great price increase in games. Going from 800 mhz RAM at CL 10 to 1600 at CL 7 improves only 2-3% at max gaming. Usually RAM speed is important to compression and video editing, not so much for games. There's an article here on TH that compares various RAM speed and latencies and explain well what I've just said, here it is: http://www.tomshardware.com/reviews/memory-scaling-i7,2...
(The article is made for Core i7 systems in mind but it's the same thing with all other sockets if they are not before the Core 2 era)
Having said this, higher frequencies are however useful if you intend to overclock since you have more margin to do it, above all for i7 systems.