7970 Crossfire @ 5760 x 1080 16x vs 8x

[Zephids]

I currently have a Sapphire 7970 OC powering 3x 23" monitors @ 5760 x 1080. My i7 2600k is sitting at 4.2 Ghz and I have 8 gigs of Corsair DDR3 1866mhz RAM. My motherboard is linked below and only supports 16x or 8x 8x.

http://www.amazon.com/gp/product/B00518M74I/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

My question is, will I see a significant different at this resolution running 8x 8x instead of 16x 16x?

Edit: I probably should have mentioned that this Mobo and GPU are PCIe 3.0 (which I've heard is equal to PCIe 2.0).

 

[hdeezie80]

Well with PCI-e 2.0 your not going to scale as nicely as IB, or SB-e but I don't think the performance drop from 2 way SLI, @ PCI-e 2.0 x8x8 is going to very noticable when it comes to high end video cards. I'm playing @ 2560 x 1440 on a single GTX 680 which is a little over 2 X standard 1080p resolution and never hit less than 50 frames while gaming so I doubt that you would have any issues on crossfire 7970s. Really what's more important for high resolutions is the amount of video memory you have available, crysis 3 for me maxes out about 2.2 GB using txaa so I would say that you'd at least want 3gb for that resolution. I would suggest taking a look at some WQHD monitors or something like the Dell UltraSharp U2913WM you get bigger resolutions/wider aspect ratios without having to stare at bezels in between monitors

 

[hdeezie80]

It scales just fine, no more than 1% performance loss on average.

yeah I was saying it would be barely noticeable under 2 way SLI/crossfire. I think you see more of a performance drop with midrange cards, when i did crossfire with 2 7770's on ivy bridge it was maybe like +10 - 15 frames per second @ 1920 x 1080. Really rides on current drivers aswell, some games just play horribly in SLI/crossfire, and others you'll get a massive boost in performance.