What sets the two BARAM heatsink models apart is - fin density - the number of aluminum fins each heatsink packs into the roughly 105mm vertical space. The original BARAM heatsink has a fin spacing of ~3.5mm at the outer tips. The BARAM 2010 model adjusts that value by 0.5mm, so its fins are spaced 3.0mm apart. A fraction of a millimeter different for sure, but enough to cumulatively add ten additional fins into the BARAM 2010's fin stack.