Hello all.
 
I got two GTX 970's to upgrade my alienware aurora R4 from the single 680 that it came with.  I just recently had the motherboard replaced under warranty, and now if I try to install both cards, I get no video at all.  Both cards work alone in either slot, but if I install both I get nothing.  Alienware customer service said I need to upgrade my 875W power supply to run it, but everything I've read, including this sites power supply tool, is telling me that 875W is plenty of power to run the two cards.  And to top it off, both cards worked fine on the old motherboard...until it broke.  So, before I go through the expense and headache of installing a larger power supply, am I wrong in thinking that 875W is enough for these cards?  I'm I perhaps missing something?
 
Thanks
 
Faethore

Yes, the bios was the first thing I checked.  Alas, I already bought two ACX cooler cards from EVGA B stock a couple months ago.  I didn't realize the blower style was better until recently.  EVGA probably isn't going to let me trade them in hehe. 
 
I think I'll call alienware CS back and insist they fix it or send another motherboard.  Thanks for the quick reply.

The Video cards both have their own dedicated (2x) six pin connectors.  As far as 4 pin connectors, none that I'm aware of.  The only things hooked up besides the two video cards are one HHD and one Optical (dvd) drive, neither of which are using 4 pin connectors.  I was running some tests on the two cards, and one of the cards seems to have an issue.  The computer intermitantly fails to detect it when it's installed by itself on start up.  So I'm beginning to think one of my cards is bad.

Yah I did, one of them seems to be going bad...i'll call tech support on monday to see about getting it RMAed.

As far as I know the R4 only came with an X79 Motherboard by Alienware, it has a daughter board as well.
DELL 7JNH0 LGA2011 MB System Link