Originally Posted by feznz
Just a question about the MVE is anyone aware of any problems with the PCIe slots?
I was ready to RMA 1 of my GPUs when I noticed my PCIe 1 was running @ x8. I tried to force it to run @ x16 in bios but didn't work.
So I moved my 2nd GPU to PCIe 2a then 3 and the card wouldn't work in either slot so I put it back in PCIe 1 now I cannot get my sound card working in any of the spare slots.
I am now going to RMA my board what a pain that's my water loop in my avatar.
As mentioned earlier you should be running at x8 if you're running in crossfire on the MVE. It seems crappy, but it's really not. Even with 7970's or 680's you're not even close to PCIe 3.0 8x bandwidth. It's a little odd when dealing with tri-fire or quad-fire as then one of the slots is running at x16 and the rest at x8. My guess is that the difference has everything to do with the fact that the bridge chip is being used with 3-4 GPUs but with 1-2 you're still just using the regular Z77 PCIe lanes so you're limited to x16 or x8 + x8 on a S1155 CPU.
As far as the second card working - how do you mean? You do know that you can't run a monitor off of the card with Crossfire correct? All connections for video must be at the first card only. If by that you mean that with the second card added you cannot get Crossfire to work at all (i.e. can't set the driver to Crossfire mode, or don't see the card at all in the bios) then yes, RMA that board as it has issues - provided that the GPU itself isn't the problem.
If you look back in this thread a ways you can see a chart of the proper placement for cards for either SLI or Crossfire - that's the way the board works, for better or worse.
I don't particularly like it either, but wanting it to be different is useless. If you wanted x16 + x16 and more slot placement options for other peripherals then a S2011 board like the RIVE would be a better choice. I know that doesn't help all that much but it is what it is.