ALUMINIUM-HEATSINK-20x20x6MM is small 20x20x6 mm aluminium heatsink radiator specially made for A10/A20 BGA chips. During heavy computations like HD video decoding these chips heat up, and BGA package have less power dissipation capability than A13 TQFP package with big metal pad on back. This is why if you want to use A10/A20 for playing video and in environments with higher ambient temperatures is good to add heatsink radiator.
olimex 
Dec 28, 2013 @ 20:49:17
hey! where did it go? 404 now 😦
Dec 28, 2013 @ 21:17:38
https://www.olimex.com/Products/Components/Misc/ALUMINIUM-HEATSINK-20x20x6MM/
Dec 28, 2013 @ 21:11:32
ok, the URL in the post had a typo. https://www.olimex.com/Products/Components/Misc/ALUMINIUM-HEATSINK-20x20x6MM/ works fine.