Question : Problem: RAID Contollers

We initially bought two of these HP proliant DL140 servers on a slight budget and opted for 2 x 80GB drives mirrored in Windows.

Now, can we add a RAID controller to manage the two SATA drives by hardware RAID?

What do we need to purchase to do this?

Answer : Problem: RAID Contollers

Here's the list of supported bits for it assuming it's G3, as -DJL- says it is dependant on whether hotswap or not.
http://h18004.www1.hp.com/products/quickspecs/12509_div/12509_div.html