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A little help with my new SLi setup please.

post #1 of 13
Thread Starter 
Ok so you can see on my sig rig the mobo and everything I have. Well when I threw my second MSI gtx680 lightning in my rig and went to check gpuz it says both of the cards are running in x8 on the PCI slots instead of one x16 and one x8. I know this will be just a slight fps decrease for not having two x16 slots. That's my mistake but why does gpuz say they are both running in x8 and not one of each? And Is it really that bad if they aren't both x16?
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post #2 of 13
Thread Starter 
Oh and also in MSI Afterburner I have the setting on to sync both cards so they will run the same clocks. Well I go to GPUZ and they are running different clock speeds. Whats up with that also?
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post #3 of 13
You won't notice the difference. Singularly it will run at 16x, but dual cards will be 8x (mine's the same)

Edit: main card will be running 2D clocks, the other basically switches off till you are using 3D (as in a game, not a 3 dimensional screen!)
Edited by Spacedinvader - 7/3/13 at 5:02am
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post #4 of 13
Sandy, Ivy, and Haswell only have 16 lanes. My Z77X-UD4H does the same thing smile.gif
    
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post #5 of 13
Thread Starter 
hmmm what do you mean only have x16...cus my board says x16 x8 x4 on my lanes?
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post #6 of 13
He means 16 lanes max (I think!)

1 card - 16x, 2 cards - 8x, 3 cards - wouldn't bother cos you will get a fair bottleneck running them all at 4x
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post #7 of 13
Thread Starter 
Ok good deal so there shouldn't be much difference if any running them at x8? and what about my different clock speeds showing in GPUz?
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post #8 of 13
P55, P67, Z68, Z77, Z87 all only have 16 pcie lanes

so two cards will be x8 / x8

X79 has 40 pcie lanes and could do the full x16/x16
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post #9 of 13
Quote:
Originally Posted by squishy18 View Post

Ok good deal so there shouldn't be much difference if any running them at x8? and what about my different clock speeds showing in GPUz?

stuck an edit on post 3 for that;

Edit: main card will be running 2D clocks, the other basically switches off till you are using 3D (as in a game, not a 3 dimensional screen!)

I'd post a screeny of my AB showing the same thing but I'm at work redface.gif

Fire up a game thumb.gif
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post #10 of 13
I believe the difference in FPS for 16x PCI-E and 8x PCI-E is near 2-3 FPS maximum. I doubt there will be any penalties, unless you REALLY need 3 FPS.
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