Following up on the
25mm-thick Coolworld 240 radiator a day later.
First thing I have to point out is that the temperature improvement, within the T1, is likely larger than the ~2c I mentioned yesterday. I say this because today I realized I was never actually able to sustain a 5GHz 9700k @ 1.285v P95 test within the T1, and that the readings that I'm comparing the Coolworld numbers against are actually from a case that had lower temps overall than the T1.
Having said that, the Coolworld is still unequivocally better than the ST25 radiator because in 15 10-minute P95 26.6 tests, the only time it performed close/worse than the average ST25 score was at the peak ambient temperature for the day (when the heat index outside was 107F/41.66C, it performed 2C worse). The other 14 tests, the core average ranged from 1.625C better to 5.375C better (this was basically testing right after leaving PC off for a few hours). The average of the "24 hours later" tests performed under the same conditions as yesterday came in at 3C better than the ST25 in my old case.
Note that the typical outlier Intel core also never failed any of these tests (and it even went as far as being able to sustain 5.1 GHz at 1.345v, something not ever possible previously), which is the biggest tell that the Coolworld radiator is just better at managing temperature overall than the Alphacool.
Since I'll stick with this radiator, I'll drain the loop tomorrow and clean it with system reboot to see what kind of additional funk comes out of it to see if there's anything that ya'll should be cautioned on. And then one last thing to note that I didn't realize until about the 8th test was that the noise level for the slim fan is definitely louder on the Coolworld radiator than the Alphacool, but the A12x25 sounds about the same.