<> = Noise levels at different speeds = This is nicely supported by [[https://github.com/Rem0o/FanControl.Releases| Fan Control]] now, so it's worth knowing what your RPM and PWM correlation is like. == Pump == This is an EK D5 pump in a FLT120 reservoir. || PWM || RPM || Noise || || 0% || 800 || Silent || || 10% || 800 || Silent || || 20% || 800 || Silent, 20% seems to be the floor for control || || 25% || 1070 || Silent || || 30% || 1360 || Silent || || 35% || 1640 || Some whine || || 40% || 1950 || Barely audible even in close proximity || || 45% || 2200 || Barely audible even in close proximity || || 50% || 2500 || Just noticeable if listening under desk || || 55% || 2770 || Somehow quieter than above, same as 45% || || 60% || 3050 || Quiet if listening under desk || || 65% || 3330 || Pump whine just audible from sitting position above desk || || 70% || 3620 || Pump whine higher pitched and more noticeable || || 75% || 3950 || Pump whine at maximum noise acceptable in general (quiet) conditions || || 78% || 4075 || Weird sweet spot, somehow better than 75% or 80% || || 85% || 4450 || Occasional liquid swishing noises || || 100% || 4775 || Frequent liquid swishing noises || == Pump speed vs flow == Same EK D5 pump in a FLT120 reservoir. I rebuilt the loop when I changed to the AP201 case, and that changes all the flow values because the loop is different. It's now much less impeded, meaning I get more actual flow for a given pump speed. || Pump PWM || Pump RPM || Flow meter volume || Flow meter tacho || Notes || || 100% || 4775 rpm || 3.6 L/min || 83 rps || - || || 85% || 4450 rpm || 3.3 L/min || 76 rps || - || || 78% || 4075 rpm || 2.9 L/min || 67 rps || - || || 75% || 3950 rpm || 2.8 L/min || 63 rps || - || || 65% || 3330 rpm || 2.3 L/min || 52 rps || - || || 55% || 2770 rpm || 1.8 L/min || 40 rps || - || || 45% || 2200 rpm || 1.3 L/min || 30 rps || - || || 35% || 1640 rpm || 0.7 L/min || 16 rps || - || || 30% || 1360 rpm || 0.4 L/min || 9 rps || - || || 25% || 1140 rpm || 0.1 L/min || 4 rps || Slowest speed that avoids low-flow alarm || == Fans == A pair of Corsair ML140 fans on a Corsair 280mm radiator in the top of the case. || PWM || RPM || Noise || || 20% || 400 || Silent || || 35% || 700 || Silent || || 45% || 915 || Just noticeable if listening under desk || || 50% || 1040 || Just noticeable sitting normally above desk || || 60% || 1240 || Comfy noise level above desk || || 70% || 1400 || Modestly noisy, about as much as you'd want in general (quiet) conditions || || 80% || 1590 || Noisy || || 90% || 1730 || Very noisy || || 100% || 1875 || Too bloody noisy! || = Heat loads = || Components || Estimated load (Watts approx) || || Idle || 25 || || Full CPU || 120 || || Full GPU || 250 || = Fan Control settings = Having gotten a sense for lower and upper bounds that make me happy, I've gone with the following: || || Toe of curve || Idle speed || Shoulder of curve || Load speed || || Pump || 30°C || 1360 rpm || 42°C || 3600 rpm || || Rad fans || 30°C || 700 rpm || 42°C || 1500 rpm || This is using the Auto curve, which takes an expected Idle temperature and maximum acceptable Load temperature, and interpolates between them. It'll maintain the Idle speed as long as the liquid temp is below the lower threshold, and ramp up as high as the Load speed as the liquid temp approaches the upper threshold. This ensures that the maximum noise will never be above my comfy levels, even though it means leaving potential cooling performance on the table. = Results = NB: these results are old, they're not for the current system as of 2024-03-22 This is mostly about finding a sweet spot for being quiet at idle, and sufficiently cool under load, without being too noisy. This is the new loop layout in the Phanteks Evolv Shift Air, after Maru helped out with reworking everything. 280mm radiator with 2x 140mm Corsair maglev fans. == Low speeds == * 34% fan - 655 rpm * 45% pump - 2200 rpm * 0.5L/min flow rate - 12rps on the meter || Load || CPU temp || GPU temp || Loop temp || Notes || || CPU only || 84 C || 29 C || 28 C || Cinebench R23 || || GPU only || 63 C || 54 C || 33 C || Furmark || || GPU and half-CPU || 90 C || 59 C || 37 C || Furmark and Cinebench limited to half usual threads || || GPU and full-CPU || n/a || n/a || n/a || Not tested because the CPU throttles at 90C || Loop speeds are simply too low to get heat out of the chip fast enough, the CPU will lower the boost ceiling to try and stay at 90 degrees. With some GPU undervolting we get a very healthy improvement in temps: || Load || CPU temp || GPU temp || Loop temp || Notes || || GPU only - stock || 63 C || 54 C || 33 C || - || || GPU only - undervolted || 57 C || 48 C || 31 C || - || == Medium speeds == * 50% fan - 1000 rpm * 60% pump - 3060 rpm * 1.0L/min flow rate - 24rps on the meter || Load || CPU temp || GPU temp || Loop temp || Notes || || CPU only || 82 C || 27 C || 27 C || Cinebench R23 || || GPU only || 54 C || 48 C || 31 C || Furmark || || GPU and half-CPU || 82 C || 51 C || 33 C || Furmark and Cinebench limited to half usual threads || || GPU and full-CPU || 90 C || 52 C || 35 C || Furmark and Cinebench with unlimited threads || This is a fair bump in flow, which suggests that the CPU isn't being cooled effectively when running at fill-tilt, I think. I wish I'd taken note of the CPU speeds, because then the CPU-only and CPU+GPU test cases could be compared. == High speeds == * 60% fan - 1200 rpm * 100% pump - 4800 rpm * 2.0L/min flow rate - 47rps on the meter || Load || CPU temp || GPU temp || Loop temp || Notes || || CPU only || 83 C || - || 29 C || Cinebench R23 - 140W || || GPU only || 55 C || 48 C || 33 C || Furmark - 280W total power (230W GPU + 50W CPU) || || GPU and half-CPU || 82 C || 50 C || 34 C || Furmark and Cinebench limited to half usual threads - 340W power (230W + 110W) || || GPU and full-CPU || 90 C || - || 34 C || Furmark and Cinebench with unlimited threads || Not sure why I don't have GPU temps for all test cases. Very similar to medium flow case, suggesting no benefit from the higher speeds. CPU still hitting it's 90 degree ceiling. = GPU undervolting = Poking at this while running Furmark. * 34% fan * 45% pump Stock voltage settings * 54 degrees C (loop or GPU core?) * 230W GPU power draw * 83fps * 1068 mV * 1950 MHz (GPU core?) Undervolt applied * 47 degrees C (loop or GPU core?) * 185W GPU power draw * 83fps * 950 mV * 1950 MHz (GPU core?) = Links = * Todor's crazy setup: https://goo.gl/photos/EsgB777cs9pke3VMA