the heatsink only makes contact with the gpu core (if that makes sense) but it comes with a ton of stick on heatfin thingies
it makes it at least double slot, i'm not 100% sure. looking at it i think you could just about squeeze it in to 2 slots, but that's without the fan ive borked on. its probably about 3/4 slots now haha
i'll take another photo seeing as it is light now...