If were you after some semblance of meaningful data for yourself, put the CPU under full overclocked load, and measure the air-water delta for either scenario with at least a 0.1C accuracy calibrated thermometers for both the air and water temps.
It won't be super-spiffy accurate like the engineers are doing, but should give you a better rough ballpark of what's going on. Don't measure radiator performance by looking at the CPU temps, especially with the AMD on-die diodes - those things are pretty whacked from boot to boot, depending on the mobo of course.
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