PC Will Not Detect Second Graphics Card ( CrossfireX )

liambotham

Reputable
Oct 30, 2014
5
0
4,510
Heya,

Looking for a bit of help with this one as it's leaving me completely stumped - going to post my build to start off with so that people can see what I'm working with.

EDIT: Should probably mention that I'm running Win 7 x64.

Build:
PCPartPicker part list / Price breakdown by merchant
CPU: AMD FX-6300 3.5GHz 6-Core Processor (£73.98 @ Amazon UK)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£23.86 @ CCL Computers)
Motherboard: MSI 970 GAMING ATX AM3+ Motherboard (£69.56 @ Scan.co.uk)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory (£62.39 @ Aria PC)
Storage: A-Data S510 Series 120GB 2.5" Solid State Drive (£83.43 @ Amazon UK)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£39.99 @ Amazon UK)
Video Card: MSI Radeon R9 270 2GB TWIN FROZR Video Card (2-Way CrossFire) (£114.99 @ Ebuyer)
Video Card: MSI Radeon R9 270 2GB TWIN FROZR Video Card (2-Way CrossFire) (£114.99 @ Ebuyer)
Case: NZXT H440 (Black/Red) ATX Mid Tower Case (£87.98 @ Novatech)
Power Supply: Corsair Builder 750W 80+ Bronze Certified ATX Power Supply (£59.98 @ Amazon UK)
Total: £731.15 Prices include shipping, taxes, and discounts when available Generated by PCPartPicker 2014-10-30 22:00 GMT+0000

Had this thing running for months but only on a single GPU - recently purchased a second R9 270. I have tested the card on it's own, so I know that both GPUs are working 100%, but I cannot for the life of me get my PC to detect it in the second PCI 2 x16 slot. I have tried purging all drivers and fresh installing, I've tried legacy drivers, I've tried it with and without the crossfirex bridge, I've tried each card in each slot, I've tried it with my overclocking settings and without - both cards are powering up, fans are spinning on both at all times...

But no matter WHAT I seem to do, my PC WILL. NOT. DETECT. THE SECOND. CARD.

Does anyone have ANY suggestions? Do I have a faulty mobo? I've tried seating and reseating the second card multiple times thinking there may have been a connection error etc, but I've been left completely at a loss.

This isn't my first build, isn't even my first crossfirex build so I'd like to think I'm not missing something stupidly obvious, but if I am please point it out to me as I really don't fancy RMAing my mobo that's given me no problems whatsoever up until this point :(
 

Superlp12

Distinguished
Feb 18, 2013
261
0
18,810




Did you try doing a clear cmos? It works for me when nothing else work.