I decided to make the water block in the same manner I made it for my K6-2 450 (see other HowTo). The CPU-socket allows for a water block which is no bigger than 50x50 mm.

In picture 1 are all the parts needed for the water block, including the hold-down plate.
The parts for the water block: a solid copper block 50x40x15 mm, 2 copper plates 50x15x5 mm, 2 brass water plugs and a copper plate 100x50x5 mm.
To ensure optimum cooling I wanted 3 water canals in the water block, so that the middle canal is exactly above the CPU-core. In the 50x40x15 mm copper block, I bored 3 10 mm holes through the 40 mm side. On each side opposite to each other 2 adjoining canals are connected by routing away approx 10 mm of copper (see picture 2).
Then the 2 holes for the water-plugs were bored.

The hold down-plate is made by boring 4 holes of 5 mm, so that the holes line up with the 4 holes in the motherboard around the CPU-socket. 2 holes of 15 mm are bores to enable the water plugs to come through the plate and last but not least, exactly in the middle of the 4 hole sof 5 mm, a 4.5mm hole is bored and then threaded with M5.
In the threaded hole a nylon bolt is screwed which will press the water block exactly in the middle onto the middle of the CPU-core.

The 50x15x5 mm plates were then soldered to the 50x40x15 mm block with silver, creating a 50x50x15 mm water block, as can be seen in picture 1.
Then the water-plugs were soldered in with silver also (picture 2).

To ensure as good as posible heat-transfer from the CPU-core to the water block, the block was sanded with 50,100,200,400,800 and 1200 gritt sandpaper, after which it was polished with copper-polish. The result can be sen in picture 1 (that is a Dutch Guilder, which is no longer in use as we now have the Euro).

Here the water block is installed and the finished hold-down shown.

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