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Can I crossfire in this way?

post #1 of 19
Thread Starter 
Ok so I have a Rampage 4 formula MOBO. Which means I have 4 PCIE slots which are in this order from top to bottom:

16x
8x
16x
8x

I can't use my top or bottom PCIE slots due to case restrictions but I wan't to purchase another XFX 7970 for crossfire. Can I crossfire down from my 2nd slot (8x) to my 3rd slot (16x)?

Would doing it this way give me less performance as if I had the graphics cards in the 1st and 2nd slot?

Thanks,
max

PC Specs:
MOBO: ROG Ramage 4 Formula
CPU: Intel i7 3930k 3.8GHZ Coolant: H100
GPU: ATI Radeon HD 7970 Black Edition
RAM: 16GB G-Skill Ripjaws X 2133MHZ 11-11-11-30-2
SSD: OCZ 60GB SATA3
HDD: 2TB 7200RPM
PSU: 850W Antec
Case: Antec 1200
post #2 of 19
Did I answer this for you on Yahoo Answers??? I believe so.

The board supports PCIe 16x 3.0 and so does the card. This means 8x is plenty fast and you will have no issues running one of the cards at 8x.
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post #3 of 19
yes you can, but bolth card will run at x8
post #4 of 19
Thread Starter 
Yea you did haha! Umm ok so it won't matter that my top card is the 8x instead of the bottom one? Also because my bottom card would be the one in the 16x slot would I get more performance if I plugged my screen into the bottom card or would It not make any difference where I plug my screen in at all?

Thanks biggrin.gif
post #5 of 19
Thread Starter 
Ok so if I were using crossfire in my top 2 PCIE slots one card would be at 16x and one at 8x? how much would both cards be running at 8x effect my performance?
post #6 of 19
Both cards would run at 8x if you put one card in an 8x slot.
It's not that big of a deal really. The difference is really small, you won't notice it at all.
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post #7 of 19
Thread Starter 
In that case it is possible to crossfire at 16x if you put both cards in 16x slots?biggrin.gif
post #8 of 19
I don't know if it is just me but it kind of seems like you are ignoring what I am trying to tell you. I'd like to point out first that performance testing between a GTX 680 on 8x 2.0 to 16x 2.0 showed noticeable gains in performance. The same tests going from 16x 2.0 to 16x 3.0 shows NO gains in performance by one tester.

From those tests you could possibly conclude that anything over the speed of 16x 2.0 does not benefit the GTX 680 which also means that anything over 8x 3.0 would not benefit that card.

Now to the real deal



So what I am trying to say is that 8x 3.0 is as fast as 16x 2.0 and that it's more than enough speed to max out the performance of your video cards.

If you can get them to both fit into the 16x slots then obviously that is the way to go if you have a SLI jumper that will work BUT I highly doubt that it will improve the performance since PCIe 16x 2.0 is plenty fast enough and PCIe 8x 3.0 is the same speed as 16x 2.0

Hope that helps

There are tons of reviews, comparisons, and shoot outs. 3.0 is immediately higher performance as soon as you have an SLI situation causing a card to go to 8x. You have 3.0 so you are good to go and your card will be hard pressed to go past the max speed of 8x 3.0 in fact from what I am reading it can't exceed that speed.

Here are some of the links you should read up on.
Anandtech
Some guy who did some tests between 8x 2.0, 16x 2.0, and 16x 3.0 with GTX 680s
some more info


The conclusion from HARDOCP (read this)!


Bottom line is if you can get those cards into 16x then do it. But if you can't the worse scenario is that maybe just maybe you will have as much as a 4% loss in performance but even that is just a maybe and I don't think it was seen with the 7970 but instead with the gtx 680. Also that performance gap was with 16x 2.0 vs 16x 3.0 not 8x 3.0 vs 16x 3.0. The bandwidth isn't the only improvement in 3.0 there are other things as well but the jist of things is that 16x 2.0 is < or = to 8x 3.0 and is plenty of bandwidth.
Edited by givmedew - 3/8/13 at 12:28pm
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post #9 of 19
Thread Starter 
Exactly what I needed to know. Thank you very much biggrin.gifthumb.gif
post #10 of 19
Thread Starter 
I have an XFX HD R7970 DD card and I'm thinking of crossfiring it with an XFX HD 7970 DD Ghz edition. Obviously the Ghz edition is a little bit faster. Just to confirm can I crossfire the 2?

Also would it matter which one I plug my screen into?

Thanks thumb.gif
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