There is a copper core inside that touches GPU and memory chips to increase cooling efficiency. It works in the same way: the air is sucked into a heatsink by the turbine and then driven though the cooling fins. The cooler is quite noisy.

Digit Life has a combined review of the Gainward Bliss 7800GT and the 6800GS Goes like Hell model:

F.E.A.R.: In this game, heavy for accelerators, the 7800 GT from Gainward gets a nice advantage over the reference card. Even if it cannot outperform the 7800 GTX, at least they are on a par now. That's a huge plus. We can see the same advantage over the X1800 XL as well. Only the X1800 XT is a leader again. But don't forget that its price is much higher. 512 MB of memory produce a proper effect, but only at 1024x768, where the card provides excellent gameplay. Considering how voracious this game towards a GPU, we expected that increasing the memory bandwidth would yield little effect and we were right.  The situation with 6800 GS is almost the same as in the previous case. Only the advantage over the 6800 GT is not that large and the 6800U is still a leader. However, these cards as well as the X850 XT PE are much more expensive. The X1600 XT is an outsider. Yep, this card is cheaper. Though it's not so cheap but it can lose 30% and more.

Summary: Gainward Bliss 7800GT/6800GS Goes Like Hell 512MB PCI-E cards are excellent products! Gainward specialists did a great job! Excellent performance, even more expensive competitors are outperformed, an interesting design, moderate prices, they are expected to be only a tad higher than for the regular reference cards.  These accelerators produce the best impression! The company still pays much attention to the quality. Both cards have excellent 2D image quality even at 1600x1200@100Hz. I repeat that you can control the cooler noise and so it's not much of a problem.