There's a very low ceiling when it comes to overclocking with the R700 because of the heat.
Like any other processor, lowering the core temps is conducive to running at higher frequencies while maintaining stability. You wouldn't make the same argument about running an overclocked CPU with a stock cooler vs. a more efficient aftermarket cooler, so why would you think the R700 is any different?
Mainly because few regular PC users look into aftermarket VGA cooling solutions. In most cases, it isn't necessary.
But if I had the option between running a GPU at 70 idle or 40 idle, that's kind of a no-brainer if OC performance was priority one over any related additional costs. Running a pair of R700s in Crossfire config is best done with cases that place VGA cards between a 120mm intake and 120mm exhaust fans in addition to the stock or aftermarket cooler.
A stock 4870x2 has no temp problems when installed in an appropriate case, and it is not much more than a pair of R700 GPUs with 2GB worth of memory modules on a single card. The inside of an Antec 900 with 5 fans isn't even slightly warm.
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