Long post, specific question near the end? I recently decided to keep my (soon) 2 year old 2.0GHz CD MacBook for (at least) another year, sticking to my long lasting 3 year upgrade cycle (which puts my next purchase sometime in 2009). The first thing I did was throw out my (nearly full) custom 200GB@4200 disk for a new WD 320GB@5400, and the difference is extreme... seriously... it's like I actually got a new machine. But now I've started getting used to that, I've started looking at the next potential upgrade: RAM. The first thing I did, back when I first got the machine was to rip out the 2 x 256MB it came with and install 2 x 1GB TwinMOS RAM. Since then RAM prices has plummeted, and I can get a 2GB Mac certified Corsair chip for NOK 399,- or, even cheaper, a 2GB TwinMOS chip for 349,- (they also have suitable non-certificated Corsair at 375,-, a Crucial chip at 415,- and a Kingston one at 419,-). So, the question is: Do I get 1 or 2 of those...? I've read the guides and understand that more RAM is always better, so 3GB should be better than my current paired 2GB, but also that my MacBook can only access 3.3GB of the 4 if I get 2 sticks. But here's what I don't know: Will I get the speed benefit from having a matched pair with the 2 x 2GB configuration, even if the machine cannot utilise all of that...? Any techheads out there that can help me? Has anybody tried the different configurations?