I currently have 3GB in my e2009 MP. And it's actually fine - I don't need more, I just found that having istat on made me want more 
So since turning istat off, everything feels better again as I don't have that silly - you are using 70% of your ram - look me in the eye every few seconds!!!
So I'm just going to get a 1GB stick to take my ram to 4GB, and then when the 4GB sticks drop in price (maybe in the next year or two), will get 3 of those to take me to 12GB
I had 4GB in my PC and that was absolutely fine - I'm sure 4GB will be fine in here too, and the best bit is it will only cost me £15 !! As opposed to £101 if I want an extra 2GB (to take me to 6). The money saved will go on a fourth HD, a 1.5TB disk that will be used for timemachine, with my two 500GB disks going into raid to hopefully double my performance on disk!
Well that's my plan, thought I'd share it with you
So since turning istat off, everything feels better again as I don't have that silly - you are using 70% of your ram - look me in the eye every few seconds!!!
So I'm just going to get a 1GB stick to take my ram to 4GB, and then when the 4GB sticks drop in price (maybe in the next year or two), will get 3 of those to take me to 12GB
I had 4GB in my PC and that was absolutely fine - I'm sure 4GB will be fine in here too, and the best bit is it will only cost me £15 !! As opposed to £101 if I want an extra 2GB (to take me to 6). The money saved will go on a fourth HD, a 1.5TB disk that will be used for timemachine, with my two 500GB disks going into raid to hopefully double my performance on disk!
Well that's my plan, thought I'd share it with you