Hi all Hope this is the right place for this thread. I've recently installed Ubuntu 64 bit on my mac pro (for various reasons) and found that despite having 8GB RAM in the system, Ubuntu only sees 2GB. My RAM configuration is 4 sets of 2GB sticks, 2 sticks in each memory board. There's 2GB in the first slots, then nothing in the second, then another 2GB in the third slots, then the fourth is empty. I spaced them out like this in the hope they might stay cooler....Dunno if it works or not. Anyhow, OS X and Windows 7 has no problems accessing all 8GB, it's just Ubuntu that can only see 2. Does anyone have any ideas? Thanks.