Found 29th Jan 2010
In order to use SLI do you have to have 2 of the same graphics card and 2 unused pci-e slots?

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I belive so yes, they must be the same, and both fit into their own PCI slot

Taken From Wiki:
two identical graphics cards are installed in a motherboard that contains two PCI-Express x16 slots, set up in a master-slave configuration

Also dont you need a cable that connects the two? Cross-Fire i think?

Original Poster

Tanchi;7695988

I belive so yes, they must be the same, and both fit into their own PCI … I belive so yes, they must be the same, and both fit into their own PCI slotTaken From Wiki:two identical graphics cards are installed in a motherboard that contains two PCI-Express x16 slots, set up in a master-slave configurationAlso dont you need a cable that connects the two? Cross-Fire i think?



I think cross fire is for ATI cards, but yes you do need some sort of metal 'thing' that connects the two together. But thank you for clarifying about the 2x pci-e slots, kinda sucks as i only have one.

Tanchi;7695988

I belive so yes, they must be the same, and both fit into their own PCI … I belive so yes, they must be the same, and both fit into their own PCI slotTaken From Wiki:two identical graphics cards are installed in a motherboard that contains two PCI-Express x16 slots, set up in a master-slave configurationAlso dont you need a cable that connects the two? Cross-Fire i think?



For Sli it's called an Sli bridge (you can get them for a couple of quid on ebay). Also, you can usually use different brands of cards so long as they are the same model e.g. an nVidia 8800GT and an Inno3d 8800GT. I think I've heard of being able to use two slightly different cards, but this was a few years ago and is quite rare.

with ATI cards you can use different cards connected

Chuckles1001;7697284

with ATI cards you can use different cards connected



You can also SLi different nvidia cards.

You need two cards of the same make, a crossfire/sli widget/cable and a motherboard with two slots and support for SLI or crossfire. The very high end twin GPU cards also use SLI/Crossfire technology.

But yeah, PCI-E 1x or PCI isn't fast enough to use for a second graphics card so if you haven't got a second PCI-E 16x slot it's not worth investigating whether the card and motherboard supports it.

DVS_Dee;7697669

You can also SLi different nvidia cards.



Yes you can but its not the same but remember when doing this you only get the speed of the slowest card x2 for ATI & Nvidia
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