Quote Originally Posted by Samson View Post
Ok people. I really need help with this.
I am asking for someone to "please" give me a correct and definitive answer.

I had a problem placing my two Radeon HD5970 in CrossFireX on this board. But I need them running at 16x each.

I had to put them in PCI-E slots #2 and #4 instead of slots #1 and #3,
because I have need of the standard old PCI slot under #3. The cards would
not fit any other way.

Now I was told that I could still get my cards to run at 16x like this.

But in Windows 7 (64-bit) in Catalyst 10.6 driver I saw something that worries me. (Please see screenshots bellow).
It says Maximum Bus Setting PCI Express 2.0 x8

Also in Everest (one of the latest versions) gives me confusing info.
Under Chipset (North Bridge) I see
PCI-E 2.0 x4 port 5 In Use @ x8
PCI-E 2.0 x4 port 5 In Use @ x8

Yet in Everest again, when I click on GPU, at the top of the right side I see
PCI Express 2.0 x16: Saphire Radeon HD5970
and further down I see
Buss Type PCI Express 2.0 x16 @ 16x

In CPU-Z (ver 1.55) under the Mainboard tab in the Graphic Interface section I see
Link Width x16 Max. Supported x16

I would also like to say that I called up Asus Tech Support and they told me that I could run a single card at 16x on any one of the four PCI-E slots.
So I tested it. With everything in place I switched to off all the PCI-E lane switches except for PCI-E slot #2
and then ran these programs again with one card enabled and I get exactly the same results you see bellow but for one card alone.

So am I running at 16x or 8x for each card ??????

Please, if anyone has a correct answer please let me know. I am very upset and worried about running at 8x.

Perhaps someone with an ATI Radeon card can explain what's going on.
If I were you, I would try many combinations to find out. First try PCI-E #1 and #3 and compare findings with these you have now.
This is not the answer you were looking for, but it could be helpful.
Anyway, look down to my reply to kpablo and what I'm going to do, so we'll know if #2 and #4 run @16x if #1 and #3 are not populated.

Quote Originally Posted by kpablo View Post
As far i know... PCI Express #2 and #4 will always be PCI Express x8. No matter if PCI-Express #1 or #3 are free.
I doubt that, but not sure. I'll try putting my GTX 480 from slot 1 to slot 2 and post result.