Well, I did say GTX 460 or GTS 450, those don't run that hot. I think it's perfectly feasible to make a single slot card for those GPU. If they can make a single slot GTX260, they can do it for this.
Water cooling isn't feasible for cost reasons, when each GPU block is $70, that adds a lot to the cost if you have 4 or 5 cards cranking. If you can have a single slot 450 or 460, just grab a P6T7 (or better yet, SR-2) and slap 7 of them on there, and that's a ton of ppd right there.
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