Does my motherboard favor AMD or Nvidia?

DexyPC

Honorable
Sep 12, 2013
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I bought the Asus P8Z77-V Socket 1155 motherboard when I built my PC not fulling looking in it (stupid idea -.-) and I bought the gtx 680 but the gpu only work to its full capability if its in one of the lower slots (the directx slot).

So if I was to buy another gtx 680 and put it into the same slot that my current one was in and didn't work in but SLI them would it still work or would I have issues of the graphics card not being fully used.
This is the issue till I found out it was a very easy fix to just move it down a slot on the Mobo
(http://www.tomshardware.co.uk/answers/id-1799271/gtx-680-3770k-lagging-games-playing-60fps.html)

Like I put in the thread about the AMD gpu I have works fine in all slots on the mobo but my nvidia card only works well in the bottom slot.
The motherboard box also only says crossfire ready and not sli which is why I have the idea in my head that my mobo favors AMD cards over nvidia.

So would the problem occur (slow gpu) if I put another gtx 680 in the top pci slot and sli'd it with my current?

Sorry if its not very descriptive, not sure how to word the question and previous problems. Still somewhat of a novices when it comes to the details of hardware.

Specs:
CPU: i7-3770k 3.5GHz0
GPU: asus direct II OC gtx 680
MBO: Asus P8Z77-V
RAM: 16gb corsair vengence 1600MHz
OS: Win 7 64 ult
 
Solution
Your mobo has SLI and CrossFireX support.
2xPCI Express 3.0 x16(x8/x8)
1xPCI Express 2.0 x16(X4)
whatever you choose they should work x8/x8 electronically using 2xPCI Express 3.0 x16 slots. However:

I prefer single card solution, only if you are looking at triple monitor gaming, or a 4k monitor, might sli/cf will be needed.
Even that is now changing with triple monitor support on top end cards and stronger single card solutions.

1-Dual gpu support is dependent on the driver. Not all games can benefit from dual cards.
2-Dual cards up front reduces your option to get another card for an upgrade.It will often be the case that replacing your current card with a newer gen card will offer a better upgrade path.
3-Dual gpu's do not always...
Your mobo has SLI and CrossFireX support.
2xPCI Express 3.0 x16(x8/x8)
1xPCI Express 2.0 x16(X4)
whatever you choose they should work x8/x8 electronically using 2xPCI Express 3.0 x16 slots. However:

I prefer single card solution, only if you are looking at triple monitor gaming, or a 4k monitor, might sli/cf will be needed.
Even that is now changing with triple monitor support on top end cards and stronger single card solutions.

1-Dual gpu support is dependent on the driver. Not all games can benefit from dual cards.
2-Dual cards up front reduces your option to get another card for an upgrade.It will often be the case that replacing your current card with a newer gen card will offer a better upgrade path.
3-Dual gpu's do not always render their half of the display in sync, causing microstuttering. It is an annoying effect.
4-The benefit of higher benchmark fps can be offset, particularly with lower tier cards.
5-Case cooling becomes more of an issue with dual cards. also the noise is higher.
6-Your psu costs are more expensive too.

 
Solution