Comparing the GTX480 PCB and GTX580 reveals differences and similarities. One thing I noticed immediately on the 580 was the lack of filter caps after the chokes, despite there being spaces for them. On the 480, the caps are present. You will also see on the Direct CUII there are filter caps post choke. Anyone with some tantalums lying around want to fill in the blanks on the 580 and see if it makes any difference in clocks?

Pics (first 2 pics from Hardware Canucks review, 3rd pic from techpowerup review):