Zalman introduced the ZM-RHS90, a new aluminum heatsink designed to cool the MOSFET area on ATI Radeon HD 4870 and 4890 based graphics cards with custom coolers. The heatsink is mounted behind the VDDC chokes, and covers the most significant set of MOSFETs on the card.
The ZM-RHS90 is made of pure aluminum for lightness, and offers high-performance cooling. You may install the heatsink by pushpins, which is apparently much easier. The availability or pricing is unknown yet, but it should show its face soon.
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