U can only X-fire the same generation card 4850-4850,4870x2-4870x2 and so on. U cant do a 3870x2 with a 4870x2.
The only problem im having is that your buying a spider platform mb but a nvidia card. With the hd4870 out its a better buy then the 9800gtx.
U have to have a low profile card for the c521.either a 8600gt or a 2600xt low pro would be your best bet.
Maybe u should do some research before u buy and get other peoples opinions. People in this forum have been very helpful in building multiple computers.
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