Dimension:
1x 1.4cm x 1.4cm
2x 0.9cm x 0.9cm
The cooling power is in passive cooling quite low (about 3 ° C less than without heatsink). In Verbbindung with a small fan, it is highly effective. ... Was really nothing else to be expected.
For developers Boards with ARM / Allwinner A10 or A20 such as BananaPi or Cubieboard / Cubietruck these fins are not suitable. These have a dimension of: 1,9x1,9 cm. Who needs something that should "self RAM cooler fins - 4 pieces" into Amazon)