With the HD6990 and the up and coming GTX590, the two top single slot GPUs are going to be closer to $1000 than to $500.  That might make the enterprising tech enthusiast wonder if perhaps it makes sense to pick up two of the second best HD6970 or GTX570‘s (the GTX580 is already $500) instead, especially as you don’t have to necessarily buy them at the same time. X-bit Labs explores the difference in performance between these cards in single and dual GPU setups as well as contrasting the two manufactures in over a dozen games. 

Getting a pair of the second best GPUs instead of one of the best - Graphics Cards 2


"In our today’s article we are going to learn which of these multi-processor technologies provides maximum performance gain compared with a single graphics accelerator and what obstacles the users may face in either case."

Here are some more Graphics Card articles from around the web:

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