I've been testing some Radeon units and I noticed that when/if I have to use the Molex 4pin (standard molex power) connector adapter to 6PIN PCI-e connector.. the cards fan spins up and seems to run, but it never actually functions.  I test all the cards in windows, just to see if they appear and I've noticed they don't show up.

Now, the PSU can handle it, tested on 1150W and a 650W, same scenario on 8 cards using 4 sets of those adapter cables that ship with retail packaging.  With 1 5850 its pulling about 248W @ 2.02A @ 122.3V @ 60Hz

Ideas?