Not my HTPC, but my server that I built in November 2008. It has a few more drives now, but nothing else has changed. Corsiar CMPSU-450VX PSU Asus M3A78 PRO AMD 780g chipset MB Athlon X2 4850e If I remember right, each drive added about 10 watts. The picture below is with only 6 HDDs installed.
10/3/11 at 2:45pm