PureOverclock posted a review of the EK Water Blocks FC-4870 GPU block
A quote from the article:
>> EK Water Blocks FC-4870 Review
Like all high-end graphics cards, the HD 4870 produces a lot of heat, and even ATi's dual-slot cooling solution has difficulties keeping the card cool. One of the best ways to achieve quiet cooling for such a card is to use liquid cooling and one of the most prominent manufacturers for liquid cooling blocks is EK Water Blocks. Today we get to test an EK-FC4870 waterblock and take a look at how it performs.
>> EK Water Blocks FC-4870 Review