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2GB is enough for any current situation.
How much do you expect to get for your 6990?
Tri sli to benefit from 4gb as you'll run out of Gpu power b4 vram, 2gb sli is more than enough for that res.
My res is 6040 x 1080 and don't have any vram issues with sli 2gb cards,as for future games who knows.
Thanks guy will buy a 4GB version soon. Which brand would be best to buy? should i go for a popular brand name or as i am going to Watercool should i just look to buy the cheapest 4gb 680 i can find?
Okay i so decided to just get 2 of the 2GB version for sli setup but Which is the better option to go for,
680 standard clock for around £368 or 670 superclocked for around £333 each?
Thanks.