Am looking to buy a new rig based on a core 2 duo or quad core at the moment - looking at memory (DDR2) it seems that there are more and more 4Gb kits advertised - anybody using them? Do you see any improvement over 2Gb? I'm going to be using Vista home and i hear that it can only address 3Gb so my question would be are there any advantages in having 3Gb over 2Gb system ram in vista. The choices seem to be Geil 4Gb kit with a CAS of 5-5-5-15 or a Corsair 2Gb kit with CAS 4-4-4-12 - does it still ring true that you can never have too much RAM??