Question Faulty PSU unit or incompatibility with other hardware ?

[Teutron]

Hi everyone, I'm having issues with a newly bought Corsair RM850x SHIFT (PSU)

From the beginning;

With the Corsair RM850x shift installed. I get stuck between Q code 19 and code 78 and no boot up.

Then I tried switching around ram sticks (g.skill tridents) but doing this gave B5s and other RAM related Q codes.

Then.
When placing the Ram back in the usual 4 dimm configuration - I goes back to getting stuck at Q code 19 or 78 and not booting up.


~
Q 78 is 'ACPI module initialization'

Q 19 seems to be CPU abnormality of some sort - but I'm not sure exactly what that tells me.
~

Jumping back a few months.

When the initial PSU died (the fractal design) I swapped it with an old PSU from another system - along with an old NVIDIA GPU 400series something, for testing.

That PSU, some budget unit:
EPS-750W.

Specs are listed here if matters: https://www.inter-tech.de/3444/EPS-750W_EN.html

With this PSU it can boot normally to windows (7 64).

So this PSU works but it obviously can't run the RTX3070 ti - not modular and lacks the cables.

Now jumping back to present time;
With the RM850x PSU - it gets stuck at either code 19 or 78 and no boot.

When I switch the RM850x out and try the old EPS-750W PSU again - the system boots up fine.

So, the system works with an old PSU - but not with this new one.

Does this mean the RM850x unit is faulty? Or somehow not compatible with this Mobo or Ram or something?

With the RM850x all case fans work and the old nvidia 400series GPU fan spins too - all except the CPU fans.

I'm using the same corresponding cables on both units - only difference is the ATX 24 pin cable on the RM850x is split - a 20 pin - and - a 4 pin - they go from two different outputs on the PSU - ending up in one ATX 24 pin in the other end.

Am I missing something obvious here?
Thanks for your time.

~
System Specs:
CPU I7-4930K
MOBO Asus Rampage IV Black Edition
GPU ASUS TUF-RTX3070TI-8G-GAMING
RAM G.Skill TridentX Series / F3-2400C10Q-32GTX Size: 32 GBytes Count: 4 x 8 GB
SSD/Hard Drives Samsung 840 Pro Series 512 GB Capacity: 512 GB
WD Black Series WD1003FZEX 1TB
Optical Drive Asus DRW-24F1ST DVD Writer
Operating System Win 7 Pro x64
Monitor 27" Eizo FlexScan EV2736W 24" Eizo FlexScan S2431W
Case Phanteks Enthoo Primo
Cooling Noctua NH-D14 SE2011
Power Supply Currently Corsair RM850x SHIFT.
Fractal Design Newton R3 800W (NOW DECEASED)

Sorry if my post is a little messy I'm using a phone currently.

 

[Lutfij]

Welcome to the forums, newcomer!

EPS-750W
https://www.inter-tech.de/3444/EPS-750W_EN.html
This is a bad quality unit. Shouldn't even be considered as a PSU. https://www.reddit.com/r/hardware/comments/ftg4h/my_psu_just_exploded/

Does this mean the RM850x unit is faulty?
It could, there have been a number of threads on this forums as well as others stating that the Shift series might've been hit by a bad batch. Might want to contact your seller as well as Corsair and get an RMA moving forward.

I'm using the same cables on both units - only difference is the ATX 24 pin cable on the RM850x is split with a 20 pin and a 4 pin - two different outputs - ending up in one 24 pin ATX.
You mean you're using cables meant for each respective PSU? For the sake of relevance, you might want to pass on how you're connected to the PSU side.

Just an FYI, you should look at a slightly higher wattage PSU if you plan to keep that RTX3070Ti as the RTX3000 series had high transient load spikes.

 

[beyondlogic]

Hi everyone, I'm having issues with a newly bought Corsair RM850x SHIFT (PSU)

From the beginning;
With the Corsair RM850x shift installed. At first - I was stuck between Q code 19 and 78 and no boot possible. Then I tried switching around ram sticks (g.skill tridents) never had issues with them but doing this gave B5s and other RAM related Q codes. When placing the Ram back in the usual 4 dimm configuration - still, the mobo won't boot - and again, it alters between getting stuck at Q code 19 and 78 and no boot.

Q 78 is 'ACPI module initialization'
Q 19 seems to be CPU abnormality of some sort - but I'm not sure exactly what that tells me.

Let's jump back a few months;
When the initial PSU died (the fractal design) I swapped it with an old PSU from another system - along with an old NVIDIA GPU 400series something, for testing. That PSU, some budget unit:
EPS-750W.
Specs are listed here if matters: https://www.inter-tech.de/3444/EPS-750W_EN.html

With this PSU it could boot normally to windows (7 64) and run some old games n whatever testing. So this PSU worked but it obviously couldn't run the RTX3070 ti - not modular and lacks the cables.

Anyways, now jumping back to present time;
With the RM850x PSU like I said it gets stuck at either code 19 or 78 and no boot. And here's the weird thing. When I switch the RM850x out and try the old EPS-750W PSU again - the system boots up fine on first attempt. Does this mean the RM850x unit is faulty? Or somehow not compatible with this Mobo or Ram or something?

With the RM850x all case fans work and ditto the old nvidia 400series GPU fan - all except the CPU fans.

I'm using the same cables on both units - only difference is the ATX 24 pin cable on the RM850x is split with a 20 pin and a 4 pin - two different outputs - ending up in one 24 pin ATX.

Am I missing something obvious here?
Thanks for your time.

~
System Specs:
CPU I7-4930K
MOBO Asus Rampage IV Black Edition
GPU ASUS TUF-RTX3070TI-8G-GAMING
RAM G.Skill TridentX Series / F3-2400C10Q-32GTX Size: 32 GBytes Count: 4 x 8 GB
SSD/Hard Drives Samsung 840 Pro Series 512 GB Capacity: 512 GB
WD Black Series WD1003FZEX 1TB
Optical Drive Asus DRW-24F1ST DVD Writer
Operating System Win 7 Pro x64
Monitor 27" Eizo FlexScan EV2736W 24" Eizo FlexScan S2431W
Case Phanteks Enthoo Primo
Cooling Noctua NH-D14 SE2011
Power Supply Currently Corsair RM850x SHIFT.
Fractal Design Newton R3 800W (NOW DECEASED)

Sorry if my post is a little messy I'm using a phone currently.

make sure your using 2 seperate pci cables or the pc will not boot do not use 1 gpu cable you need 2 seperate cables to the power supply
do not use the extra connector on the pci cable 1 cable only provides 150w. ( it will not draw power from motherboard only from psu.

do not use that old psu again its a triple rail design there prone to failure spectacularly and its not a true 650w psu. because the rails are split into 3 not 1 strong rail.

 

[punkncat]

My first recommendation would be to use the specific cables that came with each of the power supply (unless you are talking about extensions).

 

[Teutron]

Thank you guys,

The EPS 750W was only used to check if the Fractal Design had taken the Mobo og Ram with it when it died.

It hadn't, luckily.
I couldn't test the 3070ti with the EPS 750W ofc. But I could make sure the PciE lanes still worked by plugging the old nvidia GT400series GPU in instead.

The problem is that with the new Corsair RM850x shift - the system won't boot. It gets stuck at either Q code 19 or Q code 78

That's both with the 3070ti in - the GT400series in and with no GPU at all.

I made sure to use 2 different pcie outputs for the 3070 as well ofc


It just boggles my mind why the system won't even boot when this brand new RM850x shift is used.

All fans are running except for the CPU fans with the RM850x

And again when I use the old EPS-750W PSU - the system boots up fine.

What could be the cause I wonder?

It seems near impossible to configure the RM850x's cables incorrectly. But either I'm doing something connection wrong or the unit is faulty or it's incompatible with my mbo or rams 🤔

 

[Teutron]

I never mix cables from different PSUs btw

 

[Teutron]

It's just that on the RM850x -the 24 pin ATX cable - is split - with a 20 pin and a 4 pin - from two different output ports - when plugged into the PSU - while ending up in one ATX 24 pin in the other end - the one that goes into the mobo - hideous design I might add