Quote:
Originally Posted by slimcan I opened it up and I see 2 slots are used up by dell . Seems they used two 500 mb. I saw 2 more slots are free. Why dell did not use 1 slot with 1 gig. Is it because 500 mb is max per slot? |
No, it is because you have dual channel RAM. This requires two modules to function, hence the DDR
2.

You should be able to handle at least a max of 4gigs.
I'm not sure though if DDR2 requires the same timings in all the slots or not, But, it is usually a good idea to use the same manufacture for all your RAM.
EDIT:
Yep, just checked the Dell site, 4gigs seem to be the max for that system.