PSU Overload?

[BombSquad]

Ok I found an old thread on this but it never had a resolution and the forum system suggested starting a new one. 

 

I just built a new pc (specs below) and when I try to connect more than 3 devices to the SATA power cable the system flashes on, then back off again immediately. 

Background: I have a corsair 850 RM fully modular power supply. The SATA power cable only has 3 power connections; so I bought an additional SATA power supply cable which has 3 more connections. I only need 1 more, so I connected one device to the new power cable and inserted the cable into the appropriate slot on the PSU. I did NOT Hot swap them. The system was off. When I tried to power on, the system flashed on and then off. 

When I disconnect the additional power cable, the system powers on fine. If I leave the cable in the PSU but disconnect the drive, the system powers on as normal. I have tried connecting 2 different SSD drives, one a 1tb and one a 500gb, and I have tried connecting a DVDRW...and I tried it connecting a 1TB HHD...the result is the same every time. 

My system consists of the following 

 

-Gigabyte Z390 AORUS ELITE LGA 1151 ATX Motherboard 

-Intel i7 8700k not OC at the moment

-Corsair H100x Liquid cooling system with 2X fans

-GTX 980ti

-3X Additional Case fans

-2X PCIe 1tb Samsung SSD Drives

-1X SATA 1TB SSD

-1X SATA 500GB SSD

-1X DVDRW

 

The current setup is with the DVDRW disconnected. The H100X uses a SATA power connector...so that, along with the 2 SATA SSD drives makes 3, and I cannot connect a fourth. 

I have switched the power cable connection at the PSU from 1 port to the other and with only 1 plugged in the system powers on but if I try to include the second power cable connected to the DVDRW the system clicks on for a second and back off. 

I have tried several combinations but the result is always the same...3 SATA Devices connected and she powers on no problem...connect a 4th and no dice. 

The PSU is 850w, and based on several different calculators I should be drawing anywhere from 505w to 670w; well below my available output. 

My first thought was a bad cable so I ordered a new one and returned the old one...same problem. All of the cables came with the PSU except the new one. I have not tried ordering a corsair cable specifically. 

 

 

[Ezio Auditore]

Have you tried running the 4th connection with the sata data cable disconnected? If that works try running it with the CMOS reset.

If that doesn't work try checking if the rail is faulty. You could do that by disconnecting all the SSDs from the working cable(that has the 2 SSDs and cooler attached) and running just the cooler off the other cable. If it doesn't work then you have a faulty power supply and you should get it changed under warranty.

An SSD overloading a PSU is highly unlikely.

[BombSquad]

I haven't tried that yet. 

I'm an amateur...what is a CMOS reset?

I'll try the other options first chance I get and let you know if it works. Thanks for the help. 

[BombSquad]

Ok, I tried both of your suggestions. With the SATA cable disconnected but the DVDRW still connected to the power, the system wont turn on (this is with all 4 devices connected to power). After disconnecting everything, I connected the cooler to the new cable, and left everything else disconnected...the system turned on fine. 

Not sure what else to do at this point. Any additional suggestions?

[Ezio Auditore]

6 hours ago, BombSquad said:

Ok, I tried both of your suggestions. With the SATA cable disconnected but the DVDRW still connected to the power, the system wont turn on (this is with all 4 devices connected to power). After disconnecting everything, I connected the cooler to the new cable, and left everything else disconnected...the system turned on fine. 

Not sure what else to do at this point. Any additional suggestions?

Just try resetting the CMOS by following this: https://www.intel.com/content/www/us/en/support/articles/000025368/processors.html

If it doesn't work, try to get your PSU replaced under warranty. They usually don't ask too many questions and you should be able to get your PSU replaced.

[Selle]

12 hours ago, BombSquad said:

Background: I have a corsair 850 RM fully modular power supply. The SATA power cable only has 3 power connections; so I bought an additional SATA power supply cable which has 3 more connections.

 

My first thought was a bad cable so I ordered a new one and returned the old one...same problem. All of the cables came with the PSU except the new one. I have not tried ordering a corsair cable specifically. 

 

 

Du you have a link to the cable you bought? 

 

There is no standard to modulare PSU cables, you need to get cables that spesificly say they work with the PSU you have

[BombSquad]

8 hours ago, Ezio Auditore said:

Just try resetting the CMOS by following this: https://www.intel.com/content/www/us/en/support/articles/000025368/processors.html

If it doesn't work, try to get your PSU replaced under warranty. They usually don't ask too many questions and you should be able to get your PSU replaced.

So I was thinking about this...the build is brand new. I haven't even installed an OS yet (still waiting on the disc lol)...would it make sense to reset the CMOS?

[BombSquad]

6 hours ago, Selle said:

Du you have a link to the cable you bought? 

 

There is no standard to modulare PSU cables, you need to get cables that spesificly say they work with the PSU you have

I bought it from Amazon

 

https://www.amazon.com/dp/B07PXBS54L?ref=ppx_pop_mob_ap_share

 

[Selle]

1 hour ago, BombSquad said:

I bought it from Amazon

 

https://www.amazon.com/dp/B07PXBS54L?ref=ppx_pop_mob_ap_share

 

Only compatible with EVGA PSU. There is your problem. You have to use a cable that is campatible with your Corsair RM850. 

[BombSquad]

7 hours ago, Selle said:

Only compatible with EVGA PSU. There is your problem. You have to use a cable that is campatible with your Corsair RM850. 

Oh really? I didnt see where it said that. Now I feel like an idiot. Thanks for pointing that out. When I tried to pull it up in my purchase history it wouldn't let me look at it. I ordered one that is compatible. Thanks for helping me sort out my own silliness 

[Ezio Auditore]

On 6/22/2020 at 11:29 AM, Selle said:

Du you have a link to the cable you bought? 

 

There is no standard to modulare PSU cables, you need to get cables that spesificly say they work with the PSU you have

Great diagnosis dude! I thought when the op said he replaced cables he had tested that the new cable works, by using it instead of the OEM cable.

Did you have a similar experience buying PSU cables?

[Selle]

24 minutes ago, Ezio Auditore said:

Great diagnosis dude! I thought when the op said he replaced cables he had tested that the new cable works, by using it instead of the OEM cable.

Did you have a similar experience buying PSU cables?

No experience with this issue, but the way OP described the issue it sounded like a short, an the fact that there is so no standard to modular PSU cables has anoyed me, sleeved cable kits would be a lot cheaper if all brands followed the same standard. Even a set made for one Corsair psu does not work with all Corsair PSUs