Not really, but there is a way to work it out (in a
VERY rough fashion).
1 - Working out the heatload - ie: how many watts of heat you need to be able to cool.
Max Power Consumption = Max Heat Output. Go here:
http://www.extreme.outervision.com/p...ulatorlite.jsp
Fill in only the CPU and GPU fields (ie: the fields for those items upon which you intend to mount a waterblock), and the pump field (as your pump dumps heat into the system too). Hit calculate, and knock 38w off the result. What you have left is your heatload. If you want to include chipset cooling, just add another 100w for sake of argument and assume you'll be left with headroom. I recommend googling to find out what kind of overclock folks get with similar stepping CPUs and at what vCore, and completing the "overclock my cpu" field with the relevant details, as heatload gets much higher once you start overclocking it.
2 - Work out system flowrate
Use the
Flowrate Estimator to work out what your total liquid flowrate will be based on your selection of blocks etc etc. That'll give you an answer in gallons per minute.
3 - Work out roughly what CFM you need combined with liquid flowrate to cool the radiator adequately.
Take the answer from 1), and plot that on the vertical axis. Take the answer from 2) and plot that on the horizontal. Where the two cross, look for the nearest colored line. Each line represents one of 3 fans at either 12v or 7v.
Pf H = Panaflo FBA12G12-H1A - 105cfm, 6.8mmH2O, 41.5dBA @ 12v (Factory spec)
1212M = Delta WFB1212M - 72.4cfm, 3.4mmH2O, 34dBA @ 12v (Factory spec)
Nexus = Nexus D12SL-12 - 36.8cfm, 22.8dBA @12v (Factory spec)
You should be able to guage approximately what CFM-per-fan you need to be moving thru the radiator from some fudgy guesswork and approximations by dividing the space between the lines into equal increments etc.
4) Choose your fans
Once you know roughly what kind of CFM per fan you want to be using, you now need to find a fan that will produce that amount within your noise tolerance. Refer to the following data...
Look along the horizontal axis for the CFM you need. Go up til you hit the first line. This is the quietest fan for the job. Now find that fan in the links below... and look at the green line on it's graph. Find your CFM on the horizontal axis, go straight up til you hit the green line. Now go straight across to the right. That's the rpm the fan needs to go at. Now go left from the rpm til you hit the BLUE line, and go straight up. That'll tell you what voltage you need to run that fan on to achieve that rpm, and thus achieve the desired airflow at the lowest noiselevel possible.
Individual fan cfm vs noise vs rpm vs voltage graphs:
Source:
http://www.xtremesystems.org/forums/...d.php?t=150261
Doneskis. Your system should now be capable of returning coolant to [ambient + 10degC] (ish)
If this results in your only choice being fans you consider to be excessively noisy, you can recalculate it settling for a final coolant temp of [ambient + 15degC] (so roughly 5 deg C higher temps all round basically - you always sacrifice temperature for noise and vice-versa... low temp = high noise, high temp = low noise) by substituting the PA120.3 dissipation graph above with the one below... but you'll need to use the "
Liquid Flow Equivalents" converter to convert the answer from 2) into lpm, as I can't be arsed to translate the graph from lpm into gpm (sorry!!).
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I am especially interested in the GT Stealth 360 and the MCR320, the former I own and the latter I'm interested in 
Originally Posted by Talonman
The PA120.3 is a better radiator with more surface area, better pressure drop, and possibly better air flow pressure drop. So either my temperatures are slightly off or my heat dissipated is slightly off. Also saying a fan with 70cfm is 70/47 times better is incorrect, fans work just like pumps with a pressure/flow type of curve and pressure is equally as important especially with dense radiators. Anyhow it's tough trying to get a good "Watts dissipated" from anything other than using the exact same fans and having really good equipment to measure accurate temperature differences.
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