NVIDIA is using an aluminum fin stacked heatsink, very similar to what we saw on the GTX 580.
NVIDIA GTX 680 3 WAY SLI FULL
Moving on, when we remove the shroud on the GTX 680 we see the fan, baseplate, and heatsink in full detail. Overall this staggered design is not too difficult to work with, though with one socket facing the opposite way it might require some cable repositioning if you have a well maintained cable run. With the fan otherwise occupying the space that one of the sockets would take up, this configuration allowed NVIDIA to have two sockets without lengthening the card just to fit another socket. Rather than having them side-by-side as we’ve seen on countless NVIDIA cards in the past, the sockets are stacked on each other in a staggered configuration. Because the fan is now so close to the top and at the same time so close to the rear, NVIDIA went with a unique method of arranging the PCIe power sockets. On that note, the repositioning of the fan also had its own ramifications. We’ll get into the port configuration more in a minute, but for the moment the significance is that because the GTX 680 only has half a vent NVIDIA has moved the fan to match the vent, which is why the fan has been moved up. This is due to NVIDIA’s port configuration, which uses a stacked DVI connector that consumes what would have normally been part of the exhaust vent on the GTX 580. Looking at the fan itself, compared to the GTX 580 the fan has been moved from the center of the card to the top of the card. NVIDIA tells us that this shouldn’t significantly impact the cooling of the card, particularly since it has a lower TDP in the first place, but when used in SLI it will remove some of the breathing room than the GTX 580 enjoyed. Notably, due to a combination of card length and the fan position, the “wedge” around the fan has been done away with. A radial fan at the rear of the card sucks in air and pushes it towards the front of the card. Like the past GTX x80 cards, the basic design of the GTX 680 is that of a blower. All things considered the design of the GeForce GTX 680 is not a radical departure from the GTX 580, but at the same time it also has some distinct differences owing to the fact that its TDP is some 50W lower than GTX 580.
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