Overclocking increase by going water

[obeseotron]

I'm thinking about getting a watercooling setup for my PC but am curious about the actual gains over relatively good air. I currently have:
Thermalright XP90, AS Ceramique, Panaflo Medium 90mm on a Newcastle Athlon 64 3500@2.50Ghz 1.6v
Zalman 700CU AS5 on Geforce 6800GT flashed Ultra@415/1.15
Antec P160 Case, Panaflo 120mm Low in exhuast, stock 120mm Antec exhaust fan moven to intake.
4 HDDs

The setup I've been considering includes
Danger Den RDX for CPU, Danger Den MAZE4 for GPU, Swiftec MCP655 Pump and Black Ice Xtreme 120mm Signle Radiator.

I'd like to be able to keep the watercooling when I upgrade, how beneficial might such a setup be in terms of actual speed and how loud would it be?

 

[coomar]

its won't increase your overclock to much, it will be quieter depending on the radiator

 

[Greenman]

How much more of an overclock you will get depends on how hot your cpu is running now, and if a bit more voltage will help. As far as sound goes, it's just like a HSF, the more air you move over the rad, the better it cools, and the more noise it makes. So the answer to your first two questions is, it depends. As far as being able to move the water cooling setup to a new rig, sure you can, as long as it uses the same waterblocks.
I run a pretty good water cooling setup, and after tinkering with it for a year and a half or so, I'd have to say I wouldn't do it again.

 

[mindwreck]

like greenman said, it does depend on your temperatures. before i got my watercooling, my sempron was doing 50C@2.4ghz with a xp90. the heat was getting to it when i added voltage and wasn't completely stable at higher clocks, but now with watercooling, I'm running it faster and cooler

 

[Tambora]

Considering you are already at 1.6 volts for the cpu you may be near the chips limit. That is a lot of voltage for a 1.4 volt chip, if that is the stock voltage for it.

 

[obeseotron]

It's a 130mm Athlon 64, 1.5v is stock although 130mm FX chips shipped at 1.55v. I'm pretty sure it's ok at 1.6v. It generally works at 1.55, but is only 99% stable.

I was most interested in finding out what people had actually experienced going from good air cooling to water, more as a general rule than what I can expect from my current setup, which I don't feel has a ton of headroom. The thing about moving it to another system wasn't really a question, just to say that I'm not solely interested in the benefit to my current setup, which will be replaced with an x2 when prices come down and something in the g80/comparable ati generation.

 

[mindwreck]

side comment: you should think about a dual 120mm radiator. Having 1 120mm rad to cool down the cpu AND gpu is pushing it. You're going to need to put a pretty fast fan to keep your temps down.