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Potential thermal issue with RM750 and RM850


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My serial numbers start with 1338. I don't want to take this computer offline for an RMA if I don't have to since that will lose me a lot of money with downtime.
I'd recommend doing a standard RMA and mention the serial numbers, and then call customer service for an express RMA and mentioning them again. That way there's no downtime.
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  • Corsair Employee
I have 2 of the RM850 watts connected together using a dual power supply adapter so when the first one turns on, they both turn on. The fans on both spin when I power the computer on, but when the computer is under load, the second power supply fan never spins. On the first one I have 3 270X and the motherboard, cpu, etc connected to it, and that fan is always spinning. On the second one I have 3 270X only connected to it and the fan doesn't spin under load.

 

The outside of that power supply is very hot. I am running these 24/7 for coin mining, and the power supplies have not shut off yet after about 4 days, but I am worried about potentially burning the second one out since the fan isn't spinning. Should I be concerned? I don't know what the ambient temperature is, but it definitely is very warm in here since I am running a lot of graphics cards. My serial numbers start with 1338. I don't want to take this computer offline for an RMA if I don't have to since that will lose me a lot of money with downtime.

 

Simple. Now switch the two. Seriously.

 

Could be the additional load of the motherboard is enough to spin the fan on the first unit. If you switch that over to the second PSU and that fan still doesn't spin, then there's something wrong. But if the fan spins at the same time with the same load, your problem is that the three graphics cards by themselves, with no additional load, isn't enough to turn on the fan.

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Is there a way to enable the fan in the RM850 so they spin all the time and ramp up faster as power usage goes up?

Asking because I am using a custom Danger Den case and no exhaust fans in the lower section where the air intakes through the 240mm res and wanted some airflow.

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  • Corsair Employee
Is there a way to enable the fan in the RM850 so they spin all the time and ramp up faster as power usage goes up?

Asking because I am using a custom Danger Den case and no exhaust fans in the lower section where the air intakes through the 240mm res and wanted some airflow.

 

No. You can't manually turn on the fan in the RM Series. Only the AXi.

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No. You can't manually turn on the fan in the RM Series. Only the AXi.

 

Thanks for quick response. As mine is one of the affected units (1333) I will partially shroud one of my rear radiator fans directly into the RM so it is getting airflow all the time until I get my dual GTX 780's or R9 290's and determine if the fan kicks in during gaming.

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I'm in Australia and I've emailed my local retailer about the serial numbers on their RM850 models and they've said that with their current stock all the units begin with numbers less than 1341. Is there anything I can do to ensure that I don't get a faulty model?

 

Edit: I haven't purchased the unit yet, I was looking to purchase it in the next week or so.

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Thanks to reddit I just recently found out about this issue. A real bummer since I was going to build last weekend. Oh well. Trying to be patient. I opened a ticket yesterday. I'm hoping to hear back soon.

 

From what I was reading a lot of others that took advantage of the recent sale on newegg received units that need to be RMA'd. I wonder if the sale was predicated by knowledge on this issue or if it was coincidence.

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I have a 1338 and I just got my system put together. I ran Prime 95 and FurMark together for 20 minutes with no fan movement. From what I've read on here, my specs may not be enough to get the fan to spin. Is there a way to heat it up enough to make it spin or get it to shutdown if it's faulty? I have no games installed.

 

Can you explain the express RMA for me?

 

If I do RMA the unit, do I have to send everything back. It would be much easier to leave all the cables in place and just send back the PSU.

 

Thanks.

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I have a RM750 with LOT 1338. My PSU is overkill for my system and I bought it on purpose so that the fan wouldn't spin. It will be mounted in the bottom with the fan facing down. My understanding is that as long as the ambient temperature doesn't go past 45 C I should be fine. Since the case is elevated with rubber feet, there should be enough air flow from convection to cool the unit until the fan starts, right?
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hello i have the ticket 6355196

 

ive been told that my RM750 replacement is on backorder. id like to know how long the backorder period normaly is as ive waited over a month now and still nothing new. also there never seems to be any reply for guys in the UK/EU

but a estimate would be good

:sigh!:

 

Thanks

DAM

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  • Corsair Employee
So what would I have to do to cause my psu to shutdown? What exactly is "zero ambient airflow"? Can you give an example?

 

It's such a difficult situation to emulate. I suppose if all of your hardware was water cooled, the PSU fan facing up into the chassis and your rads mounted all of the way at the top, you would have so little airflow around the power supply that it could shut down if temperatures hit 45°C.

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It's such a difficult situation to emulate. I suppose if all of your hardware was water cooled, the PSU fan facing up into the chassis and your rads mounted all of the way at the top, you would have so little airflow around the power supply that it could shut down if temperatures hit 45°C.

 

Whew...when I first saw the "RM 750 recall" I panicked so hard...it's not too bad after all.

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  • Corsair Employee
This was my first build so I'm a noob at this stuff. Are you being serious about the hair dryer or are you being a jerk?

 

While I can often be a jerk, I was sort of serious. A hair dryer will generate heat that you can blow into the PSU to heat it up.

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I submitted Ticket# 6394244 over a week ago regarding my RM850 and if I would need to replace it. I recieved an email stating I would be contacted within one business day. That was 8 days ago. I do not know where else to go so I made an account and I am posting here. I would rather not replace my unit but it seems as though mine is one of the affected units. If someone from Corsair sees this or if someone can point me in the right direction that would be great. I use my computer for my school work and do not have the money to buy a replacement PSU while I wait for an RMA.

 

Thanks.

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  • Corsair Employee
I submitted Ticket# 6394244 over a week ago regarding my RM850 and if I would need to replace it. I recieved an email stating I would be contacted within one business day. That was 8 days ago. I do not know where else to go so I made an account and I am posting here. I would rather not replace my unit but it seems as though mine is one of the affected units. If someone from Corsair sees this or if someone can point me in the right direction that would be great. I use my computer for my school work and do not have the money to buy a replacement PSU while I wait for an RMA.

 

Thanks.

 

What's the lot code (first four digits of S/N) of your PSU?

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Yes. Anything < 1341.

 

 

Okay Thanks, I tried to submit an RMA Request but it made me put in another ticket. I added the Lot# and more details in the second ticket. Hopefully they respond to this one.

 

Also your reviews are awesome, I chose the RM850 because of your review. I love the PSU and it's features, hopefully my replacement will be great and I wont have to worry about overheating.

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I have a PSU with below 1341 and I will RMA now.

 

Just wanted say, for all miners out there using the RM850 as a secondary PSU, it is dangerous and your hardware will burn as soon as your gpus are in full action and the secondary PSU turns off.

 

I took the RM850 as a secondary unit to save 30€ in comparison to the ax860 and I regret my decision. I would really like to exchange the RM850 for a second AX860 and I am willing to pay the difference if there is any.

 

I live in Germany, how long will the whole procedure take? Downtime means lost money for mining rigs

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