If you cool your system below ambient air temp then yes you will experience condesation. There is an excellent article out on the front of this site showing how to insulate the chip and board. Its in one of the tips articles. However I do not think you will experience condesation unless you start tinkering with TEC's. Those will push the cpu core temp well below ambient. My water cooled abit kt7 800mhz thunderchicken has yet to show condesation and still cools my system 10C cooler than my old pep66t.
Sorry for the late reply, was rolling out to UCF>
Yes i use water wetter. You can get a bottle of it at nearly any autopart store. Its acutally soap and water but I am not sure the mix so do not go thinking you can dump a bar of dial into your tank <grin>
I will use normal plain water at first. Will see how it's going. Also my watercooling kit does not have a peltier and a radiator included. Will try the cooling performance without those components first. If necessary I will add the radiator and maybe a peltier later. Anybody using watercooling w/o peltier and radiator too? How is the cooling performance?
If you are planning to go with the water cooling without a radiator to cool the water, you might want to have a large enough tank for large amount of water. Small amount of water might not be efficient enough to cool your hot cpu. The cooling ability really depends on the amount of water you have in the tank because the CPU(only heat source) will not be enough to warm the large amount of water(since the water cools itself as well).
So don't even try it without plenty of water ready (like a 2 gallon bucket) or you might just burn your cpu.
You will not see any condense, cuz you need to cool Air well below ambient before this happens. Since you cannot do this under no circumstances with regular watercooling you are safe.
You need something to cool your water, water does not cool it self unless you of course use holy water ;D
A good test setup is an OPEN bucket, since evaporation of water into the Air removes heat away from the remaining water. Actually a two gallon bucket with one small fan blowing at the water surface can easy match any radiator you can find for watercooling. You just have to add water once a week or so.
This post also answers my question, about condensation, but what kind of temp difference can one expect to see, with a water cooled system? I have a duron 700 clocked to 1000, at 1.80 v and using a pep66 with the casing mounted on the bottom-pushing air thru and a 92 mm on the top sucking air thru it runs at 37-41 degress. Can I see low 30s with water cooling-using a rad?