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Single Nvidia 680m vs Dual 7970m

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Does anybody know what performance difference would be?

Once again, single Nvidia 680m vs Crossfire AMD 7970M.

This purely in terms of gaming. Both MMO's and FPS.

Thanks.

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At stock a 680m is hardly any faster than a stock 7970m, so in theory crossfire 7970m will blow away a single 680m. Unfortunately that is not the case since crossfire is currently broken. Crossfire gets meaninglessly high fps since both cards will turn out frames at the same time instead of properly alternating, so with crossfire you get the actual performance of one card.

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^ yeah I'm with him. Looking at it, the 7970m is a very comparable card. I'm more with NVIDIA to take use of the CUDA cores.

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The 7970m xfire will definately be a lot faster, but you are sacrificing overall quality in terms of driver updates, GPU errors, etc.

If you are pretty good at fixing random solutions for your GPU (finding the right drivers, testing for stability, etc.) then go get the xfire. I personally went with a single 680m, since it's just such as hassle dealing with those things. Admittedly though AMD has been getting better at getting out drivers/fixes.

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Additionally SLI/Crossfire solutions might experience some screen tearing issues, that can be quite annoying.

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Moreover, and most specially, micro stuttering

The latest 13.8 beta finally makes crossfire better than a single card. There's still around a 25% performance loss, but it's better than before where the frames were rendered virtually simultaneously for a 50% loss.

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If you take a look at these benchmarks you will see that the 680m and the 7970m are around the same performance level

PassMark - Radeon HD 7970M - Price performance comparison

PassMark Software - Video Card Benchmarks - Video Card Look Up

So if you have the 7970m in crossfire you'll have almost 2x the performance if the game supports crossfire correctly

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