The reason behind a single slot is because its just better.
That's not true. The cooler on the dual slot cards are higher quality higher flow coolers often found on Workstation cards, the cooler on the Ultra is likely much better than that on the GT. The question is what is 'needed' by that card. Some cards can get away with less cooling, but likely also pay a performance price if everything else is the same (ie. same core).
The reason people have issues with them is because of adjacent cards in rigs and SFF rigs.
<b>CoolS</b>, while in theory that's right, but if I DO have a gap between my graphics card and the next card (<A HREF="http://server6.uploadit.org/files/TheGrapeApe-GamingRig.jpg" target="_new">as is the case in my rig</A> [removed the extra network card]), what it means is that the HSF assembly is one slot closer to the next card, if I had another 2 cards there, I'd have a 1 card gap between my graphics card and the next thing with a one slot card, but with a two slot card, now there is no gap. It's still an issue for some, but with the amount of integrated stuff freeing up slots now, it's really mostly an issue for SFF buyers IMO.
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