Minimum Memory Dual channel 2 x 512MB
Note: Quad channel recommended minimum memory 4 x 512MB.
http://www.dell.com/content/products...tab=bundlestab


Sounds like a server mobo.
Crucial does say

Slots: 8 (4 banks of 2)
Standard Memory: 1024MB removable
Installed in pairs of modules.

So yes it has dual channel and both say in pairs.

Mismatched ram can:

1. not even able to boot up.
2. lead to hair pulling error messages.
3. Work just fine.

Spec's change on ram all the time. Why I just buy all the ram for a mobo at one time and replace whatever is installed. Sure saves on potentioal headaches.