This actually isn't about a Mac Pro, but considering that dealing with six-pin cables off the mobo is a common thing here, I figured I'd ask. We've got an HPZ840 that's got three 6-pin PCIe cables. We're trying to power a Titan Z, which calls for dual 8-pin connections (375W draw). To be safe, I'd like to tap the spare molex connectors to a 6-pin (have that cable), and then use two dual 6-pin female to single 8-pin male connectors to run into the Titan and make sure it's sufficiently powered. Problem is, I can't find these suckers anywhere. Newegg and Monoprice don't have them, Microcenter doesn't either. I found a random site that no longer carries them: http://www.aliexpress.com/store/pro...-Pin-PCI-Express-Male-Y/109575_543860007.html Can anyone help?