different gtx 680 cards sli

[Erik_29]

I have one gtx 680 2gb and one gtx 680 4gb classified, but i can't get sli to work. i have a gigabyte x79 ud5 motherboard (http://www.gigabyte.com/products/product-page.aspx?pid=4049#ov) and an intel i7 3820 processor.
Both cards are evga but i think the main problem is the size difference of the cards, it makes the sli bridge a little bit hard to connect to both. i have tried putting the 680 2gb in the last pci slot, so there would be a large gap between the cards and the bridge would fit nicely, but it doesn't work. both of the cards show up on my computer however i put them in but the ski does not work. Mabye the bridge is broken or the cards not slip compatible. idk? do you

 

[heavyartillary9]

i see your problem right off the bat!, you cant sli cards with 2 different amounts of vram, so you would need 2 2gb 680s, or 2 4gb 680s, you cant sli those 2 sadly 🙁

been there, done that, got pissed after hours and hours and hours, hopefully i saved you a little bit of anger 😀

 

[Ryan_78]

If you can connect the bridge, you're fine.
But since SLI doesn't handle different VRAM amounts, it will not work. You will need 2 cards of the same capacity. Crossfire, you can get away with different VRAM, but not SLI...

 

[Erik_29]

too bad, thanks for the quick replies! i did not buy it anyways my dad hd it in another computer so no harm done!

 

[heavyartillary9]

too bad, thanks for the quick replies! i did not buy it anyways my dad hd it in another computer so no harm done!

yay 😀
it sucks when you spend 150 bucks on a card that ends up being useless to me -_- sli, never again, now crossfire is another story 😀

 

[sizzling]

You used to be able to mix cards with different amounts of VRAM and the card with the extra VRAM would perform like it had the same as the card with less VRAM., so in your situation both would work at 2gb. However support for this was dropped a while back, no idea from which driver. This is why you might see some people saying it will work but unfortunately it no longer does.

 

[sizzling]

Crossfire has more driver issues and is slightly less supported than sli. Both have downsides.