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Potential thermal issue with RM750 and RM850


RAM GUY

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Hey Jonnyguru,

 

Well, I have changed my mind and will probably go SLI with a second Gigabyte 760GTX-OC card. What are the chances I would hit the extreme conditions that would make my RM850 to kick out if at all? Please see my system specs for more details. I have added a AF120LED fan on the bottom where the HD cage used to be on the left. I could put more fans in, but I am thinking four is enough for my 750D case. Thanks

 

 

 

I don't think it is. That's why I suggest running Furmark and Prime95 at the same time.

 

 

 

Either way is fine.

 

Looking at your system specs, I'd say your power requirements are so low that your PSU fan may never turn on. Not unless you put a second graphics card in there.

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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

We don't have an upgrade program - the replacement will be the same model. We do have an advanced RMA though so there's no downtime.
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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

 

Sell the replacement you receive and buy an AX860

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Any thoughts anyone? Thanks

 

 

 

 

 

Hey Jonnyguru,

 

Well, I have changed my mind and will probably go SLI with a second Gigabyte 760GTX-OC card. What are the chances I would hit the extreme conditions that would make my RM850 to kick out if at all? Please see my system specs for more details. I have added a AF120LED fan on the bottom where the HD cage used to be on the left. I could put more fans in, but I am thinking four is enough for my 750D case. Thanks

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24 February I bought PSU Corsair RM850 with serial number starting with 1341

 

In your forum I see some issues with this PSU

http://forum.corsair.com/v3/showthread.php?t=123484

 

But it's not clearly understand if my PSU has this issue as one says

 

1. "The affected units are in lot codes < 1341 (the first four digits of the S/N.) "

That is less than 1341

 

and other says

 

2. "1341 and below have one thermistor while serial numbers greater than 1341 have the two (separate one for the fan)."

 

My serial number is starting with 134176.

I'm planning to overload my PC but keep it quite, should I replace my PSU ?

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I should have really paid closer attention to this thread last night. So having this issue to deal with is partly my fault I bought it. Lot number 1338 here- I'll trust Mr Guru he seems like a smart cookie and keep mine, as I doubt the extremes will be met to trigger the problem. Though I was surprised when I seen the lot number on the one I bought this afternoon after Corsair was aware of the lots affected? Why where they left on the shelves?

 

Maybe I have a long lost romantic notion of Capitalism and value - and companies today valuing a consumers hard earned money and I'm out to lunch?

 

I chose the RM-750 as I liked the looks of it,seems functional and there was a rebate. I was in the city and could save some shipping and I had some faith that the gremlins, even the gremlins that turned out to not be a surprise to the producer of the unit wouldn't come to visit my purchase. Hopefully Corsair will be a little more shiny in my eyes the next computer I choose to build.

 

And to the higher echelon of Corsair maybe farther removed from the trenches. I'd be careful those attitudes on here that may or may not have reason to be crappy towards your brand name don't eventually earn a big I Told You So Sucker when they passionately rant at a misfortune that to more than not turns out to be a regular occurrence, instead of a fluke. No matter how many units you sell.

 

I'm still neutral on the matter- barely.

 

Right to me ,when it comes to entire batches of problematic product starts coming into play before the consumer reaches the cash register with it.

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  • 3 weeks later...

Recently I bought a RM 850, arrived yesterday at my house. After his arrival went searching further, and found this topic. Even called the same, because my motherboard has not arrived yet. I wonder if this problem happens with any number less that 1341 series, or if you are just a few. My even though I bought four months after the recall, come with serial numbers starting in 1338 ... At the moment I have a HD 7950, also new, but I intend to make her Crossfire. It's been 40 days that I'm no PC for problems in the motherboard, it is returning the warranty. I really need to send my PSU? If yes, it will come out of Brazil to the United States? I will spend much time without a PC? The fault was in store for selling me the PSU with the problem?

 

Thanks for your attention

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  • Corsair Employee
This problem occurs in all RM 750/850 or just some? Any program that I can do this test?

 

An RM750 or 850 with a serial number < 1341.

 

Problems won't happen to everyone. Just under the correct set of circumstances that are described in the first post of this forum thread.

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Hey guys, does the problem still exists in RM850? Was planning to buy one today and saw this thread after some researches in Google.

 

Thanks.

 

The thread states that, unless the unit was manufactured prior to the 41st week of 2013 (thus the 1341 starting numbers of the serial number), your PSU will not have an issue.

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Well guys, the guy who I'm pretending to buy from said the S/N is CP9020056-WW, but I don't think that is the right number we are looking for, do you know exactly what I have to ask to him to check the number? Is the lot code or the S/N?
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Well guys, the guy who I'm pretending to buy from said the S/N is CP9020056-WW, but I don't think that is the right number we are looking for, do you know exactly what I have to ask to him to check the number? Is the lot code or the S/N?
Pretending to buy from?
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  • 3 weeks later...
Good Afternoon All...I just purchased a RM750 PS from NewEgg two days ago (04-07-2014). To my surprise the first four digits on the serial number are 1338, which puts my unit in the defective lot of the RM750s. I am currently attempting my first build and only have the case, NZXT Phantom, and a Crucial SSD hard drive. The build is going to be done when I have the funds to purchase components, so it could take a couple of months. My question is, since the PS has the pre-1341 serial number, how do I know if it is defective? Should I request a RMA and have it exchanged? I'm not really happy that NewEgg would sell me a unit that is subject to a recall. Any advice would be appreciated! Thanks!
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  • 2 weeks later...
  • Corsair Employee
Corsair was never repairing returned ones. I think I might have mistakenly said that earlier in the thread, but I was quickly corrected by a Corsair employee. The units that were repaired were not returns. They never left the factory and were repaired before they ever left the factory.
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Corsair was never repairing returned ones. I think I might have mistakenly said that earlier in the thread, but I was quickly corrected by a Corsair employee. The units that were repaired were not returns. They never left the factory and were repaired before they ever left the factory.

 

Thanks for the info, I feel happier knowing if I need to return it wont be a refurb Im getting back.

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