Question GPU power drops when starting heavy CPU loads -- I suspect it's a PSU problem ?

[Assaro]

Hello, due to a issue with my GPU i have been doing a lot of testing and noticed the GPU power usage would drop whenever my CPU would get high loads.
I am able to recreate the problem in Furmark.
Start a Furmark Test: GPU uses the maximum power as stated on the board partners website - 320W
Start Furmarks CPU Burner on all cores: GPU gower drops to around 200W

I think the issue is related to a issue with my PSU, but I am not sure what the issue might be and how to diagnose it further.

Systems Specs
Motherboard: ASRock B550 Taichi
CPU: Ryzen 7 5800X
GPU: RTX 4080
RAM: 4 x 16GB 3200MHz
Storage: 4 x SSD, 1 x HDD
Cooling: 5 Case Fans 140mm, 2 CPU Fans 120mm
PSU: Corsair RM850e

In theory this should be under the 850W limit of that PSU by more than 150 watts. PSU was bought about a year ago.

CPU and GPU are not overclocked in any way

Thank you in advance for helping out

 

[Lutfij]

Welcome to the forums, newcomer!

I think the issue is related to a issue with my PSU, but I am not sure what the issue might be and how to diagnose it further.
+
In theory this should be under the 850W limit of that PSU by more than 150 watts. PSU was bought about a year ago.
If you suspect the PSU to be the culprit, it'd be a good idea to source(borrow, not buy) a reliably built PSU with slightly higher wattage than what your current unit can deliver and see if the issue persists.

Motherboard: ASRock B550 Taichi
BIOS version for your motherboard?

RAM: 4 x 16GB 3200MHz
Got a link to the ram kit used?

 

[Assaro]

Welcome to the forums, newcomer!

I think the issue is related to a issue with my PSU, but I am not sure what the issue might be and how to diagnose it further.
+
In theory this should be under the 850W limit of that PSU by more than 150 watts. PSU was bought about a year ago.
If you suspect the PSU to be the culprit, it'd be a good idea to source(borrow, not buy) a reliably built PSU with slightly higher wattage than what your current unit can deliver and see if the issue persists.

Motherboard: ASRock B550 Taichi
BIOS version for your motherboard?

RAM: 4 x 16GB 3200MHz
Got a link to the ram kit used?

Thank you for your reply.

I have just ordered a brand new Seasonic Focus GX ATX 3.0 1000W as Amazon has offered me a full refund on the old PSU so i can rule that out either Tomorrow or Monday.

Bios Version is P3.40

I have installed 2 Sets of this Ram: https://www.corsair.com/de/de/p/mem...00mhz-c16-memory-kit-black-cmk32gx4m2e3200c16
They have not been bought at the same time but they use the same chips, i have checked that.

 

[geofelt]

What counts is how your PC works on YOUR workload.
Synthetic benchmarks are interesting but not comparable to what you are doing.
Apps will use CPU power, and GPU power, not necessarily concurrently.
You will see a limiting factor of one sort or the other.

I doubt you will see any difference with the new Seasonic 1000w; an excellent psu .
It will enable the use of very high powered graphics cards in the future.

 

[Assaro]

What counts is how your PC works on YOUR workload.
Synthetic benchmarks are interesting but not comparable to what you are doing.
Apps will use CPU power, and GPU power, not necessarily concurrently.
You will see a limiting factor of one sort or the other.

I doubt you will see any difference with the new Seasonic 1000w; an excellent psu .
It will enable the use of very high powered graphics cards in the future.

Thank you for your reply. I had not thought of that. I did some more thorough testing and the problem has been a CPU Bottleneck.
Still gonna replace the PSU, but it was definitely not faulty.

Graphics Card is still going to an RMA because it is constantly having the hotspot temperature at 111-112°C and ramping up the fans to 100% about every two or three seconds on stock settings. That was the initial reason for my tests. When i bought the card 1.5 years ago the hotspot temp was about 20°C lower. so there is a problem with it.

 

[chillhouse1]

check the temperature of your cpu with msi afterburner, and set power setting to high performance

 

[Assaro]

check the temperature of your cpu with msi afterburner, and set power setting to high performance

Assuming that CPU is just a typo:
GPU temperature in MSI Afterburner is 77°C

I do not know what kind of power setting you are talking about. I haven't found one in msi afterburner and also not in the Inno3D utility. There is also no Bios Switch on the Card

Card is a INNO3D GeForce RTX 4080 16GB iCHILL X3