Originally Posted by Bert
The other thing I would do is only order it with 2GBs of RAM, remove them and add 2 X 4GB of Kingston or Crucial RAM. Sandeep, again, is right you don't need much, but you can get 8GBs for around $45 and use the wasted expensive RAM to add to other computers IF compatible.

G.Skill is pretty good too (Best ratings across the board). All of my recent builds use G.Skill. Corsair XMS is another good one. I think the stock RAM should suffice though. There's another model of Optiplex 990 that comes with 2GB. You can buy a bunch of those and upgrade it with 3rd party RAM too. I just priced it up and it's actually more expensive to use that base model. $814 for the same stuff with 2GB of RAM. The one above is better.