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GTX 580 cannot enable SLI

post #1 of 35
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This is my first time ever SLI'ing so bare with me, but I can't seem to be able to enable SLI. The option does not show up in NVIDIA Control Panel. I've looked around and found that a few others have had this issue, and have tried multiple possible fixes to no avail. I have tried testing each card individually and they both work fine, I have tried using DriverSweeper to uninstall nvidia drivers, restart and install with new ones, I have tried reseating both cards and reseating the SLI bridge and/or flipping the bridge and trying the other connector on the cards. I am quite frustrated with this, so if anyone could help, it would be much appreciated.

Note: both cards are recognized by windows and both show up in MSI AB, EVGA Precision etc. and one of the cards (my original card) is a 1.5GB version while my new card I just got is a 3GB; I don't think this should make a difference other than only 1.5GB will be usable.
Edited by Jj333 33 - 4/2/13 at 2:54pm
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post #2 of 35
Can you check how many lanes each card runs on? SLI won't work at 4x, only 8x and above. Your mobo should automaticly split the lanes from the cpu, but it's worth checking.
post #3 of 35
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Quote:
Originally Posted by Hattifnatten View Post

Can you check how many lanes each card runs on? SLI won't work at 4x, only 8x and above. Your mobo should automaticly split the lanes from the cpu, but it's worth checking.

You mean the slots on the motherboard right? If so then yes the one card is in the x16 slot and other card is in the x8 slot, I even checked the motherboard manual to be sure and it says that this is the correct configuration for SLI.
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post #4 of 35
Could you check with GPU-Z or in the bios manually? Sandy Bridge only has 16 PCI-E lanes coming out from the CPU, so the motherboard has to split them in order to give 8x-8x to each slot (won't be 16x-8x just because the slots are wired for it thumb.gif )

Though, I really doubt it is the problem.

Edit:
Found this on hardforum
Quote:
Nvidia has removed support for SLI with cards of different memory sizes. You used to be able to do it via coolbits, but no more. I have tested this specifically with GTX 580 1.5 and 3GB cards.
post #5 of 35
Thread Starter 
Quote:
Originally Posted by Hattifnatten View Post

Could you check with GPU-Z or in the bios manually? Sandy Bridge only has 16 PCI-E lanes coming out from the CPU, so the motherboard has to split them in order to give 8x-8x to each slot (won't be 16x-8x just because the slots are wired for it thumb.gif )

Though, I really doubt it is the problem.

Edit:
Found this on hardforum

Ok I checked GPU-Z and I noticed that the card in the top slot (x16 slot) is PCI-E 2.0x16@x8 1.1 while the other card is PCI-E 1.1x16@x8 1.1

Heres a picture of both GPU-Z's

EDIT: Just noticed the part about the different memory sizes, is this true? because I was positive it could be done since many people have talked about it on here how you could do it but the maximum memory will be the size of the card with the lower memory.
Edited by Jj333 33 - 4/2/13 at 3:11pm
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post #6 of 35
Remove both cards and reinstall. Uninstall the driver and reinstall. Could try the Sli bridge upside down or another one all together.
    
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post #7 of 35
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Quote:
Originally Posted by MrTOOSHORT View Post

Remove both cards and reinstall. Uninstall the driver and reinstall. Could try the Sli bridge upside down or another one all together.

I have tried this, other than the new SLI bridge because I don't have another one, and I literally opened the plastic package that had the SLI bridge in it and immediately installed it, it's brand new. I can't see how a brand new bridge could be broken, but maybe.
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post #8 of 35
Quote:
Originally Posted by Hattifnatten View Post

Can you check how many lanes each card runs on? SLI won't work at 4x, only 8x and above. Your mobo should automaticly split the lanes from the cpu, but it's worth checking.

I think in order to get SLI certification a board must have at least 2 x8 slots, but unless something changed it'll work fine if you use a 4x slot on an SLI certified board. I tried this on my P6T once for the hell of it, got lower benchmark scores when running x16 x4 than x16 x16 of course but it worked.
Quote:
Originally Posted by Jj333 33 View Post

Ok I checked GPU-Z and I noticed that the card in the top slot (x16 slot) is PCI-E 2.0x16@x8 1.1 while the other card is PCI-E 1.1x16@x8 1.1

Heres a picture of both GPU-Z's

That's probably because it's in an idle state.
As Hattifnatten mentioned, you can't SLI those cards any more due to different sized framebuffers. Why they changed that is beyond me.
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post #9 of 35
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Quote:
Originally Posted by Vonnis View Post

As Hattifnatten mentioned, you can't SLI those cards any more due to different sized framebuffers. Why they changed that is beyond me.

I did read in that link he posted and someone said that with coolbits it can be done, do you know if this will work or not?
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post #10 of 35
Sadly, I have no personal experience with SLI, though I do know that nvidia is very strict about which cards you can use together. You might have to sell/return one of the cards and get one with matching amount of memory.
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