Motherboard will detect only one GPU

[Benedict Monro]

Okay, I'm at your mercy dear users so please help! firstly I'd just like to say hi! To everyone here, I've lurked about this site for a while and it's been a fantastic resource in aiding me throughout my various PC troubleshooting problems. I'm fairly new to PC building and well I'd have lost all hope had it not been to you fella's!

alas I present a problem I've been unable to find an answer for yet, so please help!?

I have one of these https://uk.msi.com/product/mb/Z87GD65_GAMING.html#overview

and two of these http://www.evga.com/Products/Product.aspx?pn=02G-P4-2765-KR

However my Motherboard appears to be frustratingly choosey as to when It want's to detect both, preferring to only detect one, especially when I cold boot.

I've tried all variations of PCIE Slots and Cards and One card in one slot works perfectly! Two however in SLI..... not so much

Would anybody have a solution to my problem?

My full build is

Windows 7 Home Premium 64-bit SP1

Intel Core i5 4670 @ 3,40hz
16GB DDR3 @66MHz
MSI Z87 - G45 Gaming (MS - 7821)

2047mb Nividia GeForce GTX 760 (EVGA) x 2

PSU 850W EVO Labs Cronus

 

[faalin]

what are the specs on the PSU? It seems these are Europe PSU as no one in the states has these units. I would look into an new unit as it might not be supplying enough power on the 12v rail to fully power both 760's. Not sure how you have these hooked up with power Take one cable and plug in the 8pin on the top card and the 6 pin on the bottom card then take the other cable and do the same, 8 pin from that cable to the lower card and 6 pin to the upper card. I'd give that a try and if it doesn't work ask a friend if you can try one of theirs.

 

[Benedict Monro]

what are the specs on the PSU? It seems these are Europe PSU as no one in the states has these units. I would look into an new unit as it might not be supplying enough power on the 12v rail to fully power both 760's. Not sure how you have these hooked up with power Take one cable and plug in the 8pin on the top card and the 6 pin on the bottom card then take the other cable and do the same, 8 pin from that cable to the lower card and 6 pin to the upper card. I'd give that a try and if it doesn't work ask a friend if you can try one of theirs.

Both cards power up just fine however and at times the system boots just fine and both cards are recognised immediately, would the PSU still be an issue?