http://www.tomshardware.co.uk/radeon-geforce-stutter-crossfire,review-32256.html
Conclusions:
It exists, it's particularly bad if you can't get a high fps. The only way to completely avoid it is to use one card. Next best is 3 cards, then SLi, then Xfire.
Imo the problem seems to be made worse, particularly for Xfire, by the fact that in the drivers instead of going for the least micro-stuttering they go for the highest fps as that's what people see when they look at the charts. Toms said nvidia seems to optimise differently for benchmarks and games - so 3Dmark gets max fps and stuttering, but in many games there's less stuttering I assume at the cost of a few fps.
Conclusions:
It exists, it's particularly bad if you can't get a high fps. The only way to completely avoid it is to use one card. Next best is 3 cards, then SLi, then Xfire.
Imo the problem seems to be made worse, particularly for Xfire, by the fact that in the drivers instead of going for the least micro-stuttering they go for the highest fps as that's what people see when they look at the charts. Toms said nvidia seems to optimise differently for benchmarks and games - so 3Dmark gets max fps and stuttering, but in many games there's less stuttering I assume at the cost of a few fps.
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