6600GT PCI-X asking for power connector
I have recently got another 6600GT to put with one i already have so i can run it SLI. I bought it second hand so i installed it alone in the computer first to test it out and see what kind of OC results i can expect from it. After windows loads to the desktop i get an "NVidia Sentinal" Power indicator warning, it says there isn't sufficent power to the card and it will be underclocked for stability and damage prevention. Says to connect the external power source to the card, it doesn't have one, such is the case with the pci-x cards.
I'm ruling out any other system component as the problem, since my other 6600gt runs fine and doesn't get that error.
Any ideas to the cause, and any ideas for a solution?
My system spec:
Asus A8N-SLI Deluxe
AMD 64 3500+ 2.2 @ 2.5ghz (11x227) 90nm Winchester Core
2x512 Corsair XMS 400 @ 455mhz DDR 2.5-3-3-8 1T
TTGI PSU 600w, 30A on the 12v rail
Both are eVGA 6600GT 128mb PCI-Express cards