Seeing that these fans most likely do not use a high frequency PWM then they must be controlled by a regular PWM controller. ![]() Anyways, I got a little off track there :laughing. The reason for a different model is because if a chip like Analog Devices' ADT4790 was used it would allow the user to also monitor temps and config fan speeds/temps themselves, thus offering a whole new feature set. High speed PWM controllers require a 4 wire fan to work properly and require a little more thought to be put into the design process, so Im sure that if one was ever to be included it would be in a revision, or possibly even a different model altogether. Assuming that the fan inside is a 3 or 2 wire fan, this means that the only feasible solution for it is a "low speed" external PWM controller, which classically causes noise in high current fans larger than 120mm. I cannot recall ever seeing an actual 140mm PWM fan (has 4 wires) but I could be wrong, I have not seen every fan supplier in the world I am sure. I am essentially bumping this thread because this issue is important to me as well.įrom what I can see the unit uses a 140mm fan. However, the reported PWM fan noise problem is a deal breaker. I have narrowed my search to tow PSUs, and the HX1000 sits at the #1 spot so far. I am seriously considering purchasing the HX1000 for my upgrade. So the question is, how close am I to pinpointing the issue correctly regarding a PWM fan? If it is indeed the fan, is the PSU safe enough to operate regardless of the clicking noise? Is there a way that Corsair can check with the manufacturer of the fan to confirm that PWM is the source of the noise at low RPM? ![]() I can't send it back to the retailer because the barcode is gone from the package (rebate was sent). These PSUs are VERY heavy and I can imagine shipping will be steep. I really, REALLY don't want to RMA this unit if I don't have to. Is this the only type of fan used for HX1000 units? I haven't checked my PSU to see if it has this fan or another brand (don't want to take off the grill). ![]() Two of the review sites pointed out the PSU fan being the Yate Loon D14BH-12 (L-SSS) DC 12V 0.70A model. I'm guessing here that if the sound continues then that is likely the pulse still going and not the fan hitting something inside the casing. I'm going to try and slow the PSU fan down tonight with a Q-tip and see if I hear the sound stop immediately or if it continues. Not a solution for me since I really like a quiet rig. Any louder on these fans and the "clicking" from the PSU is not noticeable. I have an Antec 900 case that runs three 120mm Antec tricool fans and one 200mm top fan, all at low setting so the pc is very quiet. What I think I'm hearing is the pulse cycles and not actually "clicking". I do remember looking into the grill of the PSU at one point and noticed the fan was rotating at low RPM. Depending on the fan's design, this noise may be nearly inaudible, or may be moderately loud and distracting to users." Accompanying each PWM pulse is a slight physical perturbation of the fan assembly, which can cause an increase in fan noise, usually in the form of a "clicking" sound at the PWM frequency. ![]() PWM modulation is simple, inexpensive, and efficient, but it applies a series of pulses to the fan's power supply. "The PWM output drives power transistor Q2, which modulates the fan's power supply. This is the best summary from one of the sites that I found to describe the issue. So after much searching the last two nights regarding this clicking noise, from review sites (figuring out what kind of fan is in the PSU) and reported issues on retail sites and this support forum of the HX 1000 clicking noise (and other models of Corsair PSU) as well as general PWM information I've come to the conclusion the problem is the fan being of a PWM type that is running on low voltage. I isolated the noise by stopping each fan until I followed the noise to the PSU, turned off the pc and noticed the clicking quieted down - it was pretty clear that the PSU was the source. I have the pc running for about three weeks (1 week was shipping and build time) and just noticed the last two days there is a muffled clicking coming from the PSU. I bought an HX 1000 from an online retailer 1 month ago along with all necessary components for new system build.
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