Janne, a reader from Finland, sent in pics and info of his water-cooled rig:

I make my system during last winter. First there was K6-2 450 that was able to do 577 (115 x 5) @ 2.7v. Now I have 533 2.2v (105 x 6) or @ 630 @ 2.4v (115 x 5.5).

Cooling is made by myself. Water block is made from copper solid 50 mm x 50mm x 10 mm block. I use drill to make waterline groove and water inlet/outlet holes in side. Over the top i welded thin copperplate and short copper tubes in place, cold block is same size copper block. Peltier is 77 W @ 16v but is feeded by standard AT-power just tuned 13.5v. Over the "cooltower" is ordinary fan-cooler just in case!

Hardest part was insulation. I insulated backside of mobo by neoprene and use same material all around. Blue tag I used to make socket and area around processor airtight to prevent condensation. In mobo P5A-B there is not much space around processor so insulation isn't good but works!

Condensation was the reason to pop the processors head plate off, there was once water! After cleaning and adding thermal paste i clued it back. Temperatures went down 1 Celsius degree. Processors pins and socket is sprayed with mineral oil to protect it from possible water.

Water pump is regular aquarium pump 400 l/h.

Radiator is size of normal cars cabin heater.

All together:

BIG tower AT and ATX power
P5A-B rev 1.03
K6-2 522 AFX 2.2 V
256 PC133 Cas 3
Voodoo 300 @ 190
Hollywood DVD decoder
Lucent modem
Network card
Lots of blowers

One more photo. Switches to control FSB and processors multiplier.