Is crossfire worth it with my setup? 1x X16 1x X16 in X4 Mode

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Priva

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Nov 21, 2013
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According to the manual of my motherboard (Asus P8Z68-V-LE btw) It says:
2x PCI Express 2.0 x16 slots (blue @ x16 mode, black @ x4 mode)

I currently have Radeon HD 7850s in XF and was wondering if it's worth it at all since the second one runs at X4 mode and not X8 / X16 like the blue slot. I heard X4 mode makes it slower? Does that mean my FPS will be horrible and only run a tad better?

Also my PSU is 850 watts is this enough power?

 
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Priva

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Nov 21, 2013
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How much performance wise will it mess with my FPS than if I had a x8 or x16 for the second slot. I have a monitor with a high resolution 1920 x 1080 so I had to upgrade and the cheapest way for me was to just crossfire another.
 
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giantbucket

giantbucket

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Nov 17, 2013
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you might be better off turning off CrossFire and using the card that's in the x4 slot to just run two additional monitors, to make a 3-screen setup. game on the main card that's x16, and web/chat/etc on the other two that are x4.

or swap your motherboard for something that has better slots (x8/x8 is the best you can hope for unless you spend a ton and get one that has the PLX chipset on it)
 
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Priva

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Nov 21, 2013
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Even though I'm in x4 mode on the second card, it'll still be at least a little bit improved FPS during gaming than it would with 1 card correct? (If I leave it how it is now) Otherwise what is the point of my board saying "CrossfireX ready"
 
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Priva

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How much of a performance issue are we talking here? (Using 16x/4x instead of 16x/8x) Is what I mean. Like will the second GPU run with 10% lower fps %20 %30? Rather than changing setup / buying new mobo because i'm already tapped from buying a new 1080p monitor and GPU if it'll kill my performance about 10% using x4 instead of x8 or higher that's not a big deal for me. If it's like 50% i'm better off just selling both gpus and saving for a 770
 
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Agente Silva

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Most people answering here are just GUESSING. I had 2*280X Xfired on a MSI G43 Gaming (1 slot pcie 3.0 and 1 slot pcie 2 - @16x and 4x) and the FPS scaling is like 90%. In Battlefield4 @5760*1080 I went from 45-70 FPS single card to 60-120 in Xfire (16x4x). I swapped mobo, to the G45 gaming (8x/8x), and the visible diference is in frame smootheness. FPS count remained pratically the same (may improved a bit).

So, short answer, even in 16x/4x Xfire you´ll have a huge FPS leap (like 90%).
 
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