AMD Radeon RX 6400 on HP Prodesk 400 G6 SFF

[MarxF]

Computer Type: HP Prodesk 400 G6 SFF

GPU: RX 6400

CPU: Intel iCore i7 9700F

System BIOS: R08 Ver.02.21.00 (07/14/2024)

RAM: 16GB

PSU: 180W

Operating System & Version: WINDOWS 11

Description of The Problem: 

I bought a Sapphire Pulse AMD Radeon RX 6400 to upgrade my HP Prodesk 400 G6 SFF, after seeing positive reviews about compatibility and performance.

Sadly, there's no way to start the PC with that graphic card installed.

After I press the power button the CPU fan start spinnning, but after few seconds the fan stops and then it restart and so on in an a loop.

I thought the original PSU (180W) was not powerful enough so I bought a 210W PSU, but it didn't work.

The RX 6400 GPU do works as a secondary card on a second monitor (the device manager recognize it). As primary card I used a cheap PCIe X1 GPU.

BUT:

1. the GPU run at very low wattage (few Watts) and the fan doesn't spin.

2. there is no way to set it as primary card since the BIOS does not recognize it in any way! I tried enabling Legacy and disabling Secure Boot, as suggested in other topics ... but it didn't work

Any suggestion?

UPDATE:

I connected the RX 6400 to the PCIe X1 via a Riser Cable.

The RX6400 is recognized by the BIOS, the PC start correctly and it seems everything is working well.

Sadly, there's still the problem of the fan not spinning, and I was able to find the origin of the problem... The Driver... As long as the driver is not installed (and the GPU is then recognized by Windows as a Generic Graphics Device) the fan spins correctly. But the exact moment I install the driver, either manually or via Windows Update, the fan stops immediately and does not restart even under heavy GPU usage.

The fan also spins during windows booting; I guess this is because the specific driver is loaded by Windows.

Any suggestion?

[NonSequitur777]

@MarxF,

Welcome to our HP Community forum!

For all intents and purposes, an RX 6400 (53-watt TDP) should theoretically work with your 210-watt power supply, but as you can see, there is not a whole lot of space between your card and your power supply for cooling.

Your HP ProDesk 400 G6 SFF is a challenging system for a graphics card upgrade.

Assuming your RX 6400 is not defective, I personally would try out some other cards, especially the Radeon PRO W6400 4GB GDDR6 (50-watt TDP).  Not only does it have a slightly lower TDP, but I have also heard good things about it being able to run on minimal power.

Kind Regards,

NonSequitur777

[Avartar]

i would think Non Sequitur777 has got it right. it seems too close to the power supply.  plus yeah you may need a lower power gpu if you are not supplying it power from pcie 8 pin connectors. 

On another note, Sorry to usurp your thread,  Non Sequitur777, i am a new user on this forum and currently am unable to create new posts yet. i seem to be only able to reply to other posts.  i am very interested in your HP 800 G3/4/5 sff upgrades and i just got myself a HP elitedesk 800 G5 with 16gb ram and i7 9700. i tested and its working. I want to upgrade it like yours and would want some guidance. but im unable to get a thread going due to my new status. 

@NonSequitur777

[Avartar]

Dear Forum Moderators, I am having issues creating a new post and i can only reply others posts. i very much would like to take part in the discussions on the pc forum here, and would like to interact with the community, but i am unable to start my own thread.  it says "You do not have sufficient privileges for this resource or its parent to perform this action.

Click your browser's Back button to continue."

Please assist. thank you. 

[NonSequitur777]

@Avartar,

Welcome to our HP Community forum!

No problem, I created a new discussion thread for you, and I suggest we continue there: Upgrading an HP EliteDesk 800 G5 by Avartar - HP Support Community - 9265172.

Kind Regards,

NonSequitur777

[MarxF]

Thank you for the reply.

Yes, the GPU card is so close to the PSU, but the previously installed card (AMD R7 430) was also there. Sadly we can't do much about it. 🙂

About the W6400, it seems that it's almost the same as the RX 6400. Same specs, except for a little lower L3 cache, and the lower TDP... I might consider purchasing it if I was sure it could work on my PC configuration.

[NonSequitur777]

@MarxF,

Been there done that: this reminds me of one of those cases where you'll have to proceed with the trial-and-error method.

For example, consider the PNY Quadro P620 V2 Specs | TechPowerUp GPU Database, which has a low 40-watt TDP, and definitely should work on your system.

KInd Regards,

NonSequitur777

[MarxF]

UPDATE:

I connected the RX 6400 to the PCIe X1 via a Riser Cable.

The RX6400 is recognized by the BIOS, the PC start correctly and it seems everything is working well.

Sadly, there's still the problem of the fan not spinning, and I was able to find the origin of the problem... The Driver... As long as the driver is not installed (and the GPU is then recognized by Windows as a Generic Graphics Device) the fan spins correctly. But the exact moment I install the driver, either manually or via Windows Update, the fan stops immediately and does not restart even under heavy GPU usage.

The fan also spins during windows booting; I guess this is because the specific driver is loaded by Windows.

Any suggestion?

[NonSequitur777]

@MarxF,

All right, this is what I would do:

Download the AMD RX 6400 driver from here -don't install it just yet: 

Link: https://www.amd.com/en/support/downloads/drivers.html/graphics/radeon-rx/radeon-rx-6000-series/amd-r....

Next, download and run this freeware utility program called DDU ("Display Driver Uninstaller") which can be downloaded from here: https://www.guru3d.com/download/display-driver-uninstaller-download/.

If you are not quite sure how to run it, please see this YouTube instructional video: https://www.youtube.com/watch?v=jxwDPu_hOD4&t=39s&ab_channel=RobeytechLive.

Once you have run DDU, install the RX 6400 driver.

Next, type in: device manager, and check your "Monitors", like this using the PC I am working with at the moment:

If it says "Generic" in any way or form, you'll need to download your monitor's driver.  For example, I am using an Acer EI322QUR P monitor, and I downloaded its driver from here.  What I am saying is that most of the time, there is a specific monitor driver provided by your monitor's manufacturer.  Once you got this driver downloaded and have extracted the file(s), right-click on the monitor name:

Then left-click on Update driver, then click on Browse my computer for drivers, then click on Let me pick from a list of available drivers on my computer, then click on Have Disk..., then on Browse..., and locate the monitor driver(s) you have just downloaded, likely in your Downloads folder.  Then highlight the driver that your PC recognizes, click on Open, then OK, then Next, and you should see the message: Windows has successfully updated your drivers, then Close.

Kind Regards,

NonSequitur777

[MarxF]

I already did it.

1.Uninstalled the video driver with DDU.

2.Installed the RX 6400 driver from the device manager.

Unfortunately, No success...