Sound Level Testing
While we were testing cooling capabilities, as outlined in our introduction article, we were also tracking the sound level of each of the coolers using a Risepro SPL meter attached to a boom arm pointed directly at the fans of the radiator at a distance of 12 inches. We recorded the dB(A) level for each fan and pump speed tested. The ambient room sound level measured 33 decibels. Displayed below are the results of our Stock Clock Testing.
Max Fans – 100% Pump Speed
With all fans turned up to about 11 on a 10-point scale, we see the DeepCool LS720 turn in a respectable level of 49.4 dB(A). This is quieter than the DeepCool CASTLE 360EX and Enermax LIQUTECH II 360, however, the MSI CORELIQUID S360 and XPG LEVANTE 360 end up a few decibels quieter. Keep in mind that for this test, all fans were going at maximum speeds and were not matched.
Subjectively, the DeepCool LS720 did not strike an annoying pitch and while it did contribute to the noise profile in the room, we’ve certainly heard far worse.
1500 RPM Fans – 100% Pump Speed
Synchronizing fans to 1500 RPM, the DeepCool LS720 scoots quickly into second place at 40.9 dB(A), only a single decibel behind the MSI MEG CORELIQUID S360. Subjectively, the DeepCool LS720 blended well with the ambient noise within the underground bunker at 1500 RPM.
1000 RPM Fans – 100% Pump Speed
Dropping down to 1000RPM, we find the LS720 tied with the MSI MEG CORELIQUID S360. The XPG LEVANTE 360 is a hair quieter and the DeepCool CASTLE 360EX and Enermax LIQTECH II 360 are a hair louder. Subjectively, it’s a toss-up as we can’t hear any of them.
600 RPM Fans – 100% Pump Speed
At our lowest tested fan speeds of 600 RPM,l we find the DeepCool LS720 tied for quietest at 35.8 dB(A). Only the DeepCool CASTLE 360EX and Enermax LIQTECH II 360 are louder, however, when we’re in the mid-30s for decibel ratings, it’s an academic difference at best as the differences are inaudible to the ear.