Both those heatsinks are past generation. The single one is the regular nVidia reference hsf with BFG's sticker on it, while the two fan one is one BFG made themselves. The two fan one is known to be insanely loud and not cool very well (I know, I used to have one until I upgraded to an NV5).
The new BFG ones are all copper with a clear plastic case around it, and are pretty big. I still have yet to hear how they work (someone on these forums posted one earlier today).