Motherboards.org has posted a review of Swiftech’s MC14 BGA Memory Heatsinks, which is a package of 8 copper heatsinks, each  14mm3.  While they may not help a card that already has sufficient cooling, it may bring new life to an older card.
“While the initial gain of 8MHz isn’t anything special, it still is enough to garner many an overclocker’s attention. To be honest with you, the best market for these Heatsinks is on the value oriented video cards that don’t already have memory Heatsinks, in order to give them a nice boost in overclockability on the memory front.”

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