In this mode with the CPU connected to FAN-1 and the Case fans connected to FAN-2 through FAN-4 and being driven (PWM) from FAN-A the CPU fan increases as load (core temp) increases and the case fans remain at the 30% duty cycle (about 600-700rpm) which is sufficient to keep the disks between 28-32C. With these Noctua Fans the best Fan mode appears to be "Optimal". It's probably worth starting another thread for but the principle observations so far are: Lets see how loud they get as the CPU heats up. So I would tentatively say that the larger size combined with the 200rpm increase and speed and likely higher static pressure makes these fans look like a winner. This is with the Noctuas running at their lowest (30% PWM) speed. So a 5-6 degree drop at the bottom of the stack of disks and 7-8 degrees at the top. I'm testing "Optimal" now and I'll do "Standard" on the next test.Īfter 1:10 with the disks highly loaded I'm seeing: I'm running dd reads and writes to generate some heat then I'll look at the Disk temperatures after a while and add some CPU load to see the slope. One at the front at 600 and one at the back. Yours seems to be quiet like a heavy metal concert! Judging by some of the reviews I could even use a passive cooler but I might need 4000rpm Deltas for that! Hopefully they will, for the most part, operate in the lower 30 to 50% band of the PWM duty-cycle where they should be fairly quiet.Ĭlick to expand.LOL - We have different definitions of "Quiet". Also having a 3000rpm maximum speed versus 1500 on the Cougars should mean they increase speed at a faster rate. They are rated at the same minimum speed (800rpm +/- 20%) as the Cougars but with a higher static pressure and larger size should pump out more air. Its not severe but I'm looking forward to see what the Noctua Industrial 140mm fans I have on order will do. So with under 25% utilization things run a bit hot. Using 2 threads (25% utilization) the CPU jumps to 64C then drops down to 59,60C and the CPU fan runs at 1300,1400 and the case fans at 800rpm. The upper HDD which were running at 39,41,41,39 are now at 35,37,37,34 so about a 4C drop.ĭropping down to 1 thread (12.5% Utilization) the core temp drops down to 54C and the fans revert back to their slow speed. With the "Standard" Fan Controller Mode the CPU jumps from 50 to 68C and the Cougar Vortex 120mm System fans move from 500,600 to 800,900rpm and the CPU fan from 1100 to 1400,1500rpm with the core temperature dropping to 64C after 10 min or so. So running your do-while I get 50%CPU as expected.
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