Diffrent graphics cards in sli

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nicedude80

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Jun 10, 2014
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Would I be able to have a 2 gb gtx 770 and a 4 gb gtx770 together? Or even a different one like a gtx 770 and a gtx 780 ti or whatever? Or do they have to be identical? Also for the first question would that make the combined memory 6 gb? Also is it worth getting the 4 gb vs the 2 gb?
 
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They have to be the same card (ie: 770 and 770). You can use two different VRAM models, HOWEVER, the VRAM isn't added together (2+2 = 2GB VRAM, 2+4 = 2GB VRAM). And if you have cards at different clock speeds, the faster of the two will downclock to that of the slower one.
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enemy1g

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Oct 3, 2013
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They have to be the same card (ie: 770 and 770). You can use two different VRAM models, HOWEVER, the VRAM isn't added together (2+2 = 2GB VRAM, 2+4 = 2GB VRAM). And if you have cards at different clock speeds, the faster of the two will downclock to that of the slower one.
 
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nicedude80

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Right, but then what does the VRAM help with, I it worth the 60 ish more dollars?
 
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Hazle

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vram is for the frame buffer. more vram is great for any resolution higher than 1080p for single card build in most cases. i.e; a single 4GB 770 will see less of a performance drop than a 2GB 770 when playing from 1920x1080 to 2560x1440 res, though the difference can be real small.

note how the 4GB 770 fares against the 2GB:
http://www.hardwarecanucks.com/forum/hardware-canucks-reviews/65636-pny-gtx-770-oc2-4gb-review-2.html

whether that's worth an extra $60 is up to you. for 1080p, i'd stick with 2GB, or the 280X's 3GB if you prefer more.

however, how much vram a GPU shouldn't be the main factor in choosing a GPU. two 2GB 760 in SLI can perform as good as, if not better than a single 6GB GTX titan in most cases. the only cons there is the possible micro-stuttering/frame time variance, though a driver update can fix that;
http://www.guru3d.com/articles_pages/geforce_gtx_760_sli_review,1.html
 
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enemy1g

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VRAM is usually going to impact how much AA you'll be able to use. The shinies, pretty much. At 1080p, people may argue that the 4GB version is more warranted moreso than the 2GB due to having to have AA on to eliminate all the jaggies and whatnot. But at 1440p, there's a whole lot more pixels to work with, and you likely don't even have to use AA, maybe a little, but definitely not as much as with 1080p. VRAM also helps at larger resolutions, it's more noticeable when you're working with 3 monitors, or a 4K monitor.
 
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