That's somewhere correct and somewhere a naïve fallacy (Milchmädchenrechnung) because we talk about using the Hardware with Boinc and that means a permanent 100% full load - exept you wan't to earn less GRC then you can. ;)
Rule of thumb for radiator space is 120mm radiator space per component + 1x 120mm + 120mm per overclocked component for a PC that has an average (max. 16h/day) usage.
Unfortunately there is no rule of thumb for a 24/7 100% usage.
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Makes no difference if you run your rig 24/7 or only 8h per day. Two 480 radiators can dissipate 1500-2000 watts of heat without any trouble, through the whole year. Water will get heated up to approximately 15 °C over room temperature and that's it - the whole watercooling system enters into an equilibrium then.
Sorry but there is a difference between running 24/7 at 100% or sporadic with different loads because of the heat capacity of water.
is the formula for the heat capacity of water and after the water is satiated the cooling capacity will drop and the fans have to spin faster (use more energy/becoming louder) to dissipate this heat.
Btw. Vardar Fans are good for Radiators (good static pressure) but they are imho pretty loud under full load.
There is no practical difference between running 24/7 and sporadic loads. Under 24/7 load, water gets heated rather quickly to approximately 15 degrees over room temperature (all measurements taken on my rig) but it isn't "satiated", it's still much cooler than the CPU and the GPU and its cooling capacity is affected very little, for all practical purposes.
Fans don't have to turn faster when the water is warmer, that's completely absurd. Heat transfer in the radiator is simply increased through larger temperature difference between the air (which is at constant room temperature) and the water. As the water gets warmer, heat transfer from the water to the air is increased even further and the water cooling system enters into an equilibrium naturally.
Vardar fans noise level at 1850 rpm is rated at 29.5 dBa which is again quite silent for all practical purposes. Of course, there are even less noisy fans on the market (for example Gentle Typhoons which even had 500 rpm models). Overall, compared to air cooling, watercooling is practically noiseless.
About the first two points - as i said - you are right and wrong at the same time but i don't wan't to hold a dissertation about heat capacity now.
The last point however is wrong (or outdated, some years ago your statement was correct), air cooling can be as silent as water cooling, e.g. BeQuiet SW3 fans have only 28.6 dBa at 2200 rpm, at 1850 consequently less dBa and this with a massive air flow capacity.
For watercooling i prefer Noctua fans, more static pressure and airflow then Vardar with less dBa but you need to decide if the higher cost justifies the 1-3 degrees celsius less temperature compared to Vardar fans.
I don't really know, what the conversation is about. I assume, that 2x 480 radiators might be not enough? The Thermaltake Core x9 can fit upto 4 480 radiators. So that wouldn't be a problem. Sorry if I misunderstood something :/
No fear... 2x 480 should be sufficient for 6x gpu + 1x cpu + 120mm - without overclocking.
The discussion expanded thru heat dissipation details and power consumption.
What is 120mm here?
2x 480mm Radiators (8x 120mm) = 6x gpu + 1x cpu + 120mm
I see, you are referring to the 'one component = one 120mm fan' rule?
I guess it's simple enough for newbs, but there is a huge difference between a high fin density radiator with 3000 rpm fans and a low fin density radiator with 1000 rpm fans.