Yes, I have the benefit of having sub-freezing temperatures for the majority of the year, and reletively low temps in the summer too. I up and decided to pick up a Thermaltake Aquarius II (yes, the cheaper lamer one) water cooler for my cooling pleasure.
At first, I rigged the system as per the included instructions, where the radiator is inside the case, along with the reservoir/pump. This worked better than air cooling, but not as much as I had hoped. My CPU was running at room temperature. This was fine and all, but since the radiator was inside the case, case fans were still required to remove the dissapated heat. I wasn't thrilled, so I modified.
First, I figured I'd build a cradle or some such device to hold the radiator on top of the case, as to permit me to remove some case fans. I decided it was too much of a hassle, and I would still have the noise from the 80MM fan on the radiator. As my computer is sitting near the outide wall, and I already have a hole in the wall for some networking cables, I decided to relocate my radiator outside.
I got some clear tubing and extented the cooling tubes through the hole to the outside. I also extended my 80MM fan power wires along with it, I figured I'd shoot for whatever cool I could get. I left the reservoir/pump inside the case, that way I could cool the entire case with a block of cold coolant, and warm the coolant as to prevent condensation around the water block. This worked better than expected.
Results? Excellent. My T-Bred 'B' 2100+ is running at 2400 MHz, 1.75V at a working temperature of 12C. My case temperature is 20C. I have a 120MM Fan on the top of the case running around 1000RPM to move the air through the case, and the PSU fans. I feel with a water block for my GeForce FX5700U my case temps would drop even more. The fan on this card is annoying, so it is likely I'll get one, then update this thread.
When the outside temps get super cold (like 10 below F) my CPU runs around 4 or 5C. I can't wait till summer and see how it handles 70F outside temps. It should be cooler than any HSF I have ever used, so life will be good.
Current Computer Configuration:
Asus A7V8X Rev. 2.01
AMD Athlon XP 2100+ @ 2389MHz (13.5 X 177)
1024MB DDR 354MHz 2-3-4-6
2 Seagate SATA 80G RAID0
GeForce FX5700 Ultra
Santa Cruz Turtle Beach
400W Antec TruePower
CD-RW, DVD-RW, ZIP100, 3.5 Floppy