Weighing it up - the maximum is 300 grams!
AMD specified a maximum weight for coolers on socket462. This is 300 grams. The weight of a cooler is important for PC manufacturers that ship PC systems. Often enough there can be centrifugal forces or shocks that pull a heavy-weighted cooler off the socket.
Especially a powerful cooler with a massive heat sink can cause severe damage to a PC system and destroy all the parts built in. Because of this, heavy models such as the Kanie Hedgehog or the Swiftech have to be packed separately before transportation. You can find the weights of the coolers in the following table.