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Thread ID: 134560	2013-07-13 11:30:00	PSU fan keeps reving up and down under no load	Jiggle (17115)	Press F1

Post ID	Timestamp	Content	User
1348887	2013-07-13 11:30:00	I got a replacement psu for a faulty one. The psu fan seems to rev up and down every minute and the computer isn't even doing anything serious, im just reading fourms and watching youtube so its not like im drawing a lot of power. Im not sure why its doing this, there doesn't seem to be any manual fan override.anyone know how to fix this or what could be doing this? Its a FSP raider PSU	Jiggle (17115)
1348888	2013-07-13 11:31:00	I got a replacement psu for a faulty one. The psu fan seems to rev up and down every minute and the computer isn't even doing anything serious, im just reading fourms and watching youtube so its not like im drawing a lot of power. Im not sure why its doing this, there doesn't seem to be any manual fan override.anyone know how to fix this or what could be doing this? Its a FSP raider PSU	Jiggle (17115)
1348889	2013-07-13 11:44:00	Are you 100% positive its the PSU fan and not the CPU fan ?	wainuitech (129)
1348890	2013-07-14 05:03:00	Are you 100% positive its the PSU fan and not the CPU fan ? Yes. Its a new PSU so thats why I notice it.	Jiggle (17115)
1348891	2013-07-14 06:08:00	Try this, remove the side of the case, and run it without any side on. Most power supplies have a temperature sensor on them that will increase the speed of their internal fan(s) if they start getting to hot then slow down again when cooler. If it runs normally without the side on the case you have a cooling problem. Check that there is nothing blocking or obstructing the air Flow, poor cabling, cards in the way can cause overheating.	wainuitech (129)
1348892	2013-07-14 06:53:00	Try this, remove the side of the case, and run it without any side on. Most power supplies have a temperature sensor on them that will increase the speed of their internal fan(s) if they start getting to hot then slow down again when cooler. If it runs normally without the side on the case you have a cooling problem. Check that there is nothing blocking or obstructing the air Flow, poor cabling, cards in the way can cause overheating. I did run the PSU outside of the case before I installed it and it was working fine. Yesterday the fan just kept revving but today it has been fine so far. Will keep an eye on it and see how it goes.	Jiggle (17115)
1348893	2013-07-16 11:34:00	PSU fan is still revving but not as bad as when I made my first post. Now it revs up for about 5 seconds every 2 minutes compared to before when it was 20 seconds every minute. Again the computer is not doing any intensive tasks, right now im reading fourms and the average cpu usage is about 15% with no drive activity. Could this be a faulty PSU? This is my 3rd PSU and this is the first time i've had this issue.	Jiggle (17115)
1348894	2013-07-16 19:55:00	If there is no PSU fan controller, the PSU is new and therefore clean of fluff etc, then it's faulty. I'd stick with Corsair, Antec or Enermax.	pctek (84)
1348895	2013-07-16 21:33:00	Some PSUs control the fan based on their loading, rather than temperature. Worse still, some use fixed-load stepping, rather than a continuously-variable curve. For example, some PSUs may up their fan speed form 20% to 50% when their output load goes above 60%. In this case, if the PSU load is fluctuating between, say, 59% and 61%, the fan will keep revving up and down between 20% speed and 50% speed. It's a cheap, simple way to do it. May not necessarily be what's occurring in your case, but it is possible. FSP's Raider is a cheap rubbishy brand (though FSP used to do another model, I forget what it was called, that was surprisingly good), so I also wouldn't be surprised if it's simply faulty.	inphinity (7274)
1348896	2013-07-17 10:52:00	If there is no PSU fan controller, the PSU is new and therefore clean of fluff etc, then it's faulty. I'd stick with Corsair, Antec or Enermax. This was a replacement for my corsair PSU which was still under warranty. Not sure if I could ask for a different PSU. Some PSUs control the fan based on their loading, rather than temperature. Worse still, some use fixed-load stepping, rather than a continuously-variable curve. For example, some PSUs may up their fan speed form 20% to 50% when their output load goes above 60%. In this case, if the PSU load is fluctuating between, say, 59% and 61%, the fan will keep revving up and down between 20% speed and 50% speed. It's a cheap, simple way to do it. May not necessarily be what's occurring in your case, but it is possible. FSP's Raider is a cheap rubbishy brand (though FSP used to do another model, I forget what it was called, that was surprisingly good), so I also wouldn't be surprised if it's simply faulty. I would have chosen a corsair but this was a warranty replacement. I do not think my PSU is loading up to 50%. Computer is pretty much idling and it still happens. So I think it might be a temperature thing. I would hate to see what would happen in the summer time when temperatures are hotter, I don't think I could take the constant revving. I have a gaming case with vents so my case is pretty noisy as it is, the reving of the PSU basically doubles the noise. The PSu is also mounted upside down so it is getting air from underneath the case and there is plenty or room for air. I will give this PSU one more week and if it keeps doing it I will see if I can get this swapped.	Jiggle (17115)
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