Originally Posted by pc-illiterate
no. people talk what they hear not what is fact.
a 280 radiator can cool a 3930k overclocked to 4ghz at 1.24v-1.25v and 3x 780s overclocked to 1000mhz with only 2x 1200rpm fans.
you need roughly whatever amount of radiator you want and can fit. its a proven fact. if youd like, go call mr bean a liar and argue with him. this isnt the place for it. if you have testing that says otherwise, pull it out. if not, well, the rule of thumb so many like to spew is wrong and irrelevant. its as bad as jack naylor and his charts.
Originally Posted by DNMock
"Rule of Thumb" means to use your thumb instead of a ruler. As in it's not accurate, but will give you a rough idea if you aren't sure
Sure if you plugged in ambient temps, thermal radiation and dissipation rates of the surface area of the contact points, the flow rate and volume of the coolant, and about 20 other variables, you could get a quite precise measurement with 99.9% or more accuracy.
Just use the 'ole rule of thumb and be right with 95% accuracy...
Highlighted the part you missed.
What type of 280mm radiator? what's the depth, fin style, fins per inch, flow resistance, material used? What kind of fans? what's the static pressure generated at 1200 rpm? Shroud? Are they exhausting with high positive pressure to aid or set to intake? What kind of blocks are used, flow rate, resistance? What is the pump set to?
If you wanna be precise, the face area of a radiator is a worthless number, Volume is what number you should really be looking at since a 10mm thick 280mm rad and a 50mm thick 280mm rad are going to have vastly different thermal dissipation rates.
You aren't wrong in what you say, however, if someone is asking if "X" is enough radiator space, odds are they aren't going to be aware of all those factors either.
The answer of "as much as you can get" is a good answer to the question, but that's not always financially feasible and up to a point diminishing returns kicks in making it wasted effort. As an example, I have two 1080mm radiators, I could get a 3rd, but that would only net me maybe 1 degree lower temps at best. Adding a 4th might net me an extra .5 degree temp improvement.Edited by DNMock - 11/12/15 at 9:26am