Jump to content
Corsair Community

Choose a UPS for the Corsair RMx PSU


DoctorIkari
 Share

Recommended Posts

Hello friends!

 

I recently upgraded my computer for work. Installed the Corsair RMx 850W PSU.

 

In our area, the electricity is periodically turned off, so a UPS was required.I have no experience in selecting a UPS, the store manager advised me to take an APC Back-UPS 850VA (~520W) UPS.

 

After connecting the computer, I decided to test the UPS. I turn off the power, and... the computer shuts down. In the APC Windows utility, the total power during operation is shown as 40-100 watts.

 

Googling suggested that my Corsair RMx 850 PSU has an aPFC. Therefore, the UPS must be selected very carefully.

 

Please tell me which UPS is suitable in my case?

Thank you very much!

Link to comment
Share on other sites

A UPS is not all that they are cracked up to be. Long ago they were used to keep servers running but batteries wear out fast adding to the cost.

 

850VA will allow you to shutdown your rig more orderly

Link to comment
Share on other sites

  • Corsair Employees
Hello friends!

 

I recently upgraded my computer for work. Installed the Corsair RMx 850W PSU.

 

In our area, the electricity is periodically turned off, so a UPS was required.I have no experience in selecting a UPS, the store manager advised me to take an APC Back-UPS 850VA (~520W) UPS.

 

After connecting the computer, I decided to test the UPS. I turn off the power, and... the computer shuts down. In the APC Windows utility, the total power during operation is shown as 40-100 watts.

 

Googling suggested that my Corsair RMx 850 PSU has an aPFC. Therefore, the UPS must be selected very carefully.

 

Please tell me which UPS is suitable in my case?

Thank you very much!

 

Nah. An RMx should work fine with a cheaper standby UPS.

 

Have you tried the "pull the plug while something is on the UPS" test with any other hardware, or just the PC?

Link to comment
Share on other sites

  • Corsair Employees
Yes, I tested my old PC. Monitor works too...

 

Weird.

 

So what are you doing, exactly? Running on UPS power and turning the PSU on or is the PC already on and you unplugged the UPS from the wall?

Link to comment
Share on other sites

Weird.

 

So what are you doing, exactly? Running on UPS power and turning the PSU on or is the PC already on and you unplugged the UPS from the wall?

 

I tested the power outage case: computers and monitors were connected to the UPS, pulled the UPS cord out of the wall, the computer with the Corsair PSU shut down.

 

People suggested that a PSU with aPFC would require a UPS that outputs a pure sine wave.

Link to comment
Share on other sites

I tested the power outage case: computers and monitors were connected to the UPS, pulled the UPS cord out of the wall, the computer with the Corsair PSU shut down.

 

People suggested that a PSU with aPFC would require a UPS that outputs a pure sine wave.

 

A bit of googling gave me this :

https://www.apc.com/us/en/faqs/FA158939/

TL:DR Active PFC PSUs can create a high current inrush when the UPS switches to battery. (takes up to 8ms they say). This can force the UPS into protection mode

 

They advise to use pure sine wave APCs in your case (page 2, Workstation class or high end gaming PCs) :

http://www.apcmedia.com/salestools/RMUZ-7DTKRC/RMUZ-7DTKRC_R1_EN.pdf

 

Since your PSU is 850W, 80+gold, say 1000W tops at the plug, could be a clue.

 

But it's not that the PSU won't stand a Modified sine UPS.. it's the UPS that can't deal with this high power PSU, slight difference.

 

If your old PC uses something close to a 500W PSU, it could explain why the UPS did not shutdown.

Edited by LeDoyen
Link to comment
Share on other sites

Since your PSU is 850W, 80+gold, say 1000W tops at the plug, could be a clue.

 

But it's not that the PSU won't stand a Modified sine UPS.. it's the UPS that can't deal with this high power PSU, slight difference.

 

If your old PC uses something close to a 500W PSU, it could explain why the UPS did not shutdown.

 

Well, I'll try to buy a UPS with a double conversion and a pure sine wave at the output in the near time. For example, Ippon Innova G2 1000.

 

I will write about the results later.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...