I see you post that from time to time, but is this a generalization or theoretical thing?
There's been no set results because non exist. There's only 6 (IIRC) companies that actually manufacture the rads that aios use and they all use basically the same blueprint, but there are some slight differences. Outsourcing the rads, it becomes a numbers game, Corsair for instance doesn't stick with just one, it uses all 6,whomever has the best deal at the time, which is why some models differ slightly from others. But performance is all within margin of error. The difference is all in the fans. Arctic, like Fractal, borrowed ideas and manufacturing outside of the 6, from ppl who make custom loops, like Aerocool (Fractal Kelvin) and produced superior results to the standard aio.
So yes, it's a generalization of capacity as far as rads go, but just like the NH-D15, that's a 250w heatsink, but the temps are due to the Noctua fans and the efficiency ratio of the fan to heatsink. With the Arctic fans on that heatsink, it might be 240w, with EK Vardars it might be 270w. So the generalization is more of an average in a range.
The higher FPI units have greater thermal tolerance, but requires stronger(also louder) fans to move air through; more aggressive fan curves are optimal and running these at lower rpm curves comes at a larger performance hit compared to lower FPI units.
Not necessarily. I have 2 rads, both optimized for 900 or lower rpm. A Hardware Labs Black Ice GTS240 - 30mm 16fpi, and a XSPC Tx240 - 20mm 22fpi. Higher fin density generally requires higher SP, not necessarily higher rpm, so the 2 rads are somewhat balanced, but the GTS has a slightly higher wattage capacity. It all depends on the total design of the rad, how many and size of the heat pipes, whether it's loop or throughput design, fpi, thickness, straight or split fin, flow characteristics etc. A 240mm rad can vary a great deal in capacity ranging from @ 200w to over 500w. My rads work best at a flow of 1.0 and 750-1000rpm, actually losing performance or not gaining any efficiency or effectiveness above that range. Other rads have a more linear efficiency line, not a bell curve, where higher rpm (and noise), higher sp just keep raising the capacity. One rad in particular never stopped gaining, even with 5k Deltas attached to it.
So the actual rad itself plays a marked amount in capacity, and that varies quite a bit, but aio rads are so similar in overall design that they are essentially the same thing, excepting the outliers like EK, Arctic, Fractal Kelvin etc.
A 240mm AIO generally speaking is @ 250w, has basically the same performance characteristics as the big air coolers, the efficiency of either, and the resultant temps, depending on the fans. The 2 best aio rad fans for years was the Scythe Gental Typhoon and the Noctua NF-F12. Neither had impressive SP, neither had impressive rpm, they both ran @ 1000rpm, but the combination of SP and cfm and rpm was as close to perfect efficiency ratio as you'd get with the aio rad design. Many fans had higher rpm, or higher cfm or higher sp, but the ratio was off, so the efficiency was off, so they didn't work as well. But. Those fans also didn't do too well either on many loop rads, wrong ratios.
My ddc pump runs @ 2000rpm. It can run upto closer to 4000rpm, but that just raises flow (and noise) well above @ 1.0gpm (230L/h) to @ 4.4gpm (1000L/h) and does basically nothing but make noise. Asetek pumps don't need to be run at 100%, it's just advised since you need software control via thermal readings to operate them safely at anything less, and that means Cam or iCue, which many don't like or wont/don't need or understand. Easier to just plug n play.
Resistance also plays a major role. Most aios use a high resistance, low flow design, higher head pressure, but loops tend to use lower resistance, higher flow designs, so don't require as much head pressure, but that's available if more components are added to the loop. Aios run @ 60-450L/h, which is fine for a single rad, but loops can tax even a D5 at 1500L/h, some requiring 2x ddc or D5 pumps.
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