A block for every socket
Speaking of metal fittings, here's two of them on the Reserator's water block:

Mmmmm. Metal fittings.

The Reserator comes with Zalman's ZM-WB2 water block, which consists of an aluminum cover and a gold-plated copper base. Using an off-the-shelf water block makes it easy for those with dual-processor systems to find matching water block for a second processor. Zalman also offers GPU blocks for graphics chip cooling.

A nearly perfect mounting surface

The water block's copper base is polished to near perfection, though a number of fine scratches are visible if you look closely enough. Proper thermal compound application should ensure that these minor scratches don't impede heat transfer between the processor and water block, and Zalman provides a tube of thermal compound with the kit.

Although a near-mirror finish and metal fittings are nice, the Reserator water block's most intriguing attribute is compatibility with a wide range of CPU sockets.

Mounting hardware for just about every socket

The block ships with mounting hardware for Sockets A, 478, 754, and 940. It should also be compatible with AMD's new 939-pin socket, which uses the same heat sink retention bracket as Sockets 754 and 940. The water block's one mounting restriction pertains to Socket A, where a motherboard that conforms to AMD's optional four-hole heat sink mounting design is required.

Despite that one limitation, the Reserator's water block is generally well-behaved across all CPU sockets. The block takes up considerably less room than standard Pentium 4 or Athlon 64/Opteron coolers, and the mounting screws are carefully threaded to ensure that the block isn't screwed down too hard. Limiting the number of threads on each screw prevents the water block from crushing a processor core or damaging a motherboard. However, even with the screws tightened as far as they'll go, the water block is just loose enough to rotate slightly from side to side. Mounting hardware keeps the block centered, and there isn't nearly enough play to break contact with the processor. However, some may prefer a tighter fit.