The GPU heatsink is a Thermaltake Crystal Orb VGA cooling fan, which I found on Newegg.com. It's not quite as short as the Iceberq 4 Pro on the CPU, but at 25mm high it's still shorter than the stock GPU heatsink. Not a whole lot shorter, though; if you're looking for something a lot smaller than the GPU heatsink, you might try something else. The Iceberq is definitely short, though, at 15mm high.
Can't say anything about how they perform yet, but as soon as I get some numbers I'll let you know.