Ive read several information posts, sites, magazines etc... so i know the generic answer to my question. Sorry if this is wrong section for post. Question: I have installed 4g of ram in my machine, why doesn't it show all the ram. But wait i know the answer, windows Xp 32bit operating system does not show all the ram etc etc, i know but if I installed 4g of ram, isn't 2.5g of ram a little low? I know it wont show or use all of it but that number just seems like i wasted my money upgrading from 2g to 2.5g for the same price that other ppl upgrade to 4g... And one more question... I have an alienware m9750 laptop. Ive been informed that even if i upgrade to a 64bit OS i will still NOT be able to upgrade past 4g simply cause its a laptop. With 2 ram slots is it impossible for me to buy and use 4g/6g chip x2?