thanks for all of the replys

the goal is to make some extra cash, ive done seti@home and folding@home with these pcs but bitcoin is the first one ive seen that I can actually get a little something back from doing this.

how are the 5830's and the 5770's noise wise?

a few of the dells are dell percisions and i think have decent psu's to get these higher end cards working.