PSU woes.

[Distinctly Average]

Over the last 5 years my PC has had a few problems. X470 Gigabyte M/B, Ryzen 2600, RTX2060 and 16GB ram. All powered by a Corsair RM750x. I built this one a couple of weeks after the 2060 was launched and back then they were actually below MSRP. Seems like such a long time ago.

 

A couple of years back and still under warranty the CPU decided it would not allow my PC to boot if TPM was enabled. So it went back to AMD via my retailer and they agreed it was faulty. AMD sent me a 2700x but it kept crashing. So I upgraded the AMD cooler to a Thermalritght Peerless Assasin and for a short while it seemed OK but again, random crashes, but not often enough to be a headache.

 

Wind forward and I got a 5800x for pennies so slapped that in along with another stick of Corsair Vengence memory. The random crashes continues and it was becoming more frequent. Then last week I saw a nice RTX5070TI at a retailer for under MSRP so I decided to buy that.

 

On fitting my PC became even more unstable. I reinstalled windows from scratch as it has been a few years. Still the problems persisted.

 

So next I built a memtest stick and after extensive testing I found one of my Corsair Vengence sticks was faulty. To be sure I always tested the memory in the same slot, one tested fine, the other loads of errors.

 

At last I thought, job sorted. The memory has a lifetime warranty and Corsair have been superb. I used their online chat and an hour or so after I filled out their quick form I got an RMA and that is now in process.

 

So currently down to 16GB Ram. Lightroom is now stable when previously it kept crashing. The tools within run a lot faster on the new GPU, especially AI noise reduction which has gone from 30-45 seconds per image to under 5 seconds per image. I was happy, that was until I tried running Doom The Dark Ages or CSGO. Randomly the screen would go black and machine reboot.

 

Turns out it was my laziness. When I plugged in the GPU to the silly new adapter, I was lazy. In this PSU each of the Type 4 PCIe cables has two 8 pin connectors on the end. Turns out it cannot supply enough power over one of these. I knew it but was just too plain lazy to plug in a second cable to the PCU.

 

Having two of these cables in my box is a bit of a mess looks wise. And now I have a nice stable PC I thought I might as well get the dedicated leads from Corsair. Unfortunately they seem rarer than rocking horse shit where I am with everyone seemingly out of stock at the moment. So anyone know of another brands cable that will work and fits well? I don't want to buy one with the wrong pinout. I did buy the supposed Corsair one from Amazon but on delivery it turned out to be a cheapo Ali Express copy so I sent it back.

[--SID--]

https://www.corsair.com/eu/en/p/pc-components-accessories/CP-8920284/600w-pcie-5-0-12v-2x6-type-4-psu-power-cable-cp-8920284 is what you need.

[jaslion]

40 minutes ago, Distinctly Average said:

4 PCIe cables has two 8 pin connectors on the end. Turns out it cannot supply enough power over one of these. I knew it but was just too plain lazy to plug in a second cable to the PCU.

It absolutly can and should. If it cannot there is something else wrong with it which well seeing the random failiures you have either point to a wonky psu or like really dirty power and a proper ups is in order.

 

 

[Distinctly Average]

On 11/26/2025 at 9:59 PM, --SID-- said:

https://www.corsair.com/eu/en/p/pc-components-accessories/CP-8920284/600w-pcie-5-0-12v-2x6-type-4-psu-power-cable-cp-8920284 is what you need.

 

On 11/26/2025 at 10:23 PM, jaslion said:

It absolutly can and should. If it cannot there is something else wrong with it which well seeing the random failiures you have either point to a wonky psu or like really dirty power and a proper ups is in order.

 

 

Sorry for the late response. I was feeling rough when I wrote my post and by the next morning full on man flu had taken hold. I am finally beginning to feel almost human again.

 

Thanks for the replies. First --SID--, I couldn't find that in the UK site but that is the correct one and in stock which was nice. at £24.99 I would have purchased but with postage that takes it to £35 so getting a little expensive for a cable just for looks. And then as per below I have decided on another plan.

 

jaslion,

 

I too would have thought so. I have not looked inside one of these particular PSUs. Some I have looked at in the past have common rails for each voltage. Others seem to have filtering or other circuitry to each socket or bank of sockets which may limit each. Looking at the available cables on the corsair site it seems the single ones are rated at 300w and the dual connector at the PSU end rated at 600w. So I will be interested to have a look at either a teardown of this PSU or I will do it myself. You could also be right that there has been something wrong with this PSU all along. The latter, despite it still being under its 10 year warranty, I just cannot be bothered with the hassle of sending it back and waiting for a return and having no PC for that period. So instead I have been looking around and two options have popped up

 

Seasonic 100w Focus - £119

Corsair RM1000x - £109

 

I am tempted to get the Corsair but I guess either would be a good option? Anything else I should consider?

 

Once I have that and it is installed I will RMA the Corsair PCU and if it returns OK or replaced as faulty I will use it in a low end build I am planning. I could dig out all m test gear and run some tests myself but TBH, I am too busy. I am sure Corsair would either put it on their own test rig or more likely, just recycle it and send a replacement. My guess is the time and effort it takes is just not worth it.

[--SID--]

The Corsair is better. Do thery both have a native 12v 2x6 cable? Otherwise you can pick https://uk.pcpartpicker.com/product/ds8Pxr/montech-century-ii-1200-w-80-gold-certified-fully-modular-atx-power-supply-century-ii-1200w or https://uk.pcpartpicker.com/product/RHfnTW/nzxt-c1200-1200-w-80-gold-certified-fully-modular-atx-power-supply-pa-2g1bb-us

[Distinctly Average]

Many thanks. And yes, the Corsair has the cable hence that being the preference.

 

I do work in IT but on enterprise and mainframe stuff. So out of touch with consumer kit so your help is very appreciated.