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HP Recommended
Z840 workstation

Hi,

I've a z840 workstation with the 1250W power unit (seems even tyo be 1450W here in France with 220V power supply)  and I want to install a nvidia gtx 3060 12gb GPU. However I only have 3x 6-pin connector from the power unit, where the GPU needs 1x8-pin connector. Would it be Ok to plug it using a 6-pin to 8-pin adaptor in one of them? I've seen that this could be hazardous but dont know if its a question of adaptor quality or a real power issue?

 

1 ACCEPTED SOLUTION

Accepted Solutions
HP Recommended

@LucaRav,

 

Welcome to our HP User Forum!

 

You should use a dual PCIe 6-pin to single 8-pin PCIe cable because a PCIe 6-pin power cable only delivers 75 watt, whereas a PCIe 8-pin power cable can deliver up to 150 watt, that is why you need two PCIe 6-pin power supply cables to "create" one PCIe 8-pin power supply connector:

 

NonSequitur777_0-1667574864163.png

 

Also make sure, if you can, that each PCIe 6-pin power cable originates from separate power rails/power outputs.

 

Here is an example of the PCIe power adapter cable you need: Amazon.com: Dual 6 Pin Female to 8 Pin Male GPU Power Adapter Cable Braided Sleeved 9 inches TeamPro....

 

Hope this was helpful.

 

Kind Regards,

 

NonSequitur777

View solution in original post

10 REPLIES 10
HP Recommended

@LucaRav,

 

Welcome to our HP User Forum!

 

You should use a dual PCIe 6-pin to single 8-pin PCIe cable because a PCIe 6-pin power cable only delivers 75 watt, whereas a PCIe 8-pin power cable can deliver up to 150 watt, that is why you need two PCIe 6-pin power supply cables to "create" one PCIe 8-pin power supply connector:

 

NonSequitur777_0-1667574864163.png

 

Also make sure, if you can, that each PCIe 6-pin power cable originates from separate power rails/power outputs.

 

Here is an example of the PCIe power adapter cable you need: Amazon.com: Dual 6 Pin Female to 8 Pin Male GPU Power Adapter Cable Braided Sleeved 9 inches TeamPro....

 

Hope this was helpful.

 

Kind Regards,

 

NonSequitur777

HP Recommended

Thanks!

"Also make sure, if you can, that each PCIe 6-pin power cable originates from separate power rails/power outputs" 

^^ How can I verify this?

Thanks again!

HP Recommended

hi

@LucaRav  check this

UNBOXING GIGABIT RTX 3060 12GB(INSTALLED HP Z820 WORKSTATION)

https://www.youtube.com/watch?v=BMSz6Flie74

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Desktop-Knowledge-Base
Windows 11 22h2 inside , user

------------------------------------------------------------------------------------------------------------
NW3DDESINGER#HPZ820#3D DESIGNER#LUMION#3DMAMX UNBOXING GIGABIT RTX 3060 12GB(INSTALLED HP Z820 WORKSTATION)SMOOTH WORKING- BEST FOR GAMES&LUMION SPECIFICATION: Graphics Processing GeForce RTX™ 3060 Core Clock 1837 MHz (Reference Card: 1777 MHz) CUDA® Cores 3584 Memory Clock 15000 MHz Memory Size ...
HP Recommended

@LucaRav,

 

Sorry for the late response.  The answer to your question is to use the two 6-pin PCIe power cables from each end (either Left & Right, or Top & Bottom), and not the 'middle' one.

 

Kind Regards,

 

NonSequitur777

 

 

HP Recommended

the HP connector is the preferred one but it can be expensive (it is also rated for 150 watts)

 

HP 460621-002

 

https://www.compeve.com/index.php?main_page=product_info&products_id=12316

 

next the optional high wattage pwr supply has 3 six pin connectors,

with two of them on one GPU pwr supply  rail and the other on a seperate second GPU pwr supply rail

 

in your case i recommend you use the SINGLE gpu connector for the 6 to 8 pin adapter and the other dual 6 pin cable for the second connection, this setup splits the GPU power draw across both GPU power rails and prevents overloading a GPU rail 

HP Recommended

Thanks!

 

@DGroves actually my GPU card has only one female 8-pin connector. So if I understand I've the choice either to connect it on one 6-pin using the HPE expansive single adaptor, or on 2 of the 6-pin using the cheapest double adaptor, am I right? Is one of the solution better than the other, independently of the price?

 

HP Recommended

@LucaRav,

 

Like you said, your GTX 3060 12GB needs to be powered by a SINGLE 8-pin PCIe connector.

 

Do NOT use a 6-pin to 8-pin connector under any condition.

 

Stick with what I suggested.

 

Kind Regards,

 

NonSequitur777

HP Recommended

indeed @LucaRav  it seems to me that this is what we see in the video

https://www.youtube.com/watch?v=BMSz6Flie74

 

Capture d’écran 2022-11-07 170214.pngCapture d’écran 2022-11-07 170331.png

Capture d’écran 2022-11-07 170529.png

--------------------------------------------- Signature ---------------------------------------------
was this reply helpful , or just say thank you ? Click on the yes button

Please remember to mark the answers this can help other users
please click on the accept as solution button if message provided an answer to the problem




Desktop-Knowledge-Base
Windows 11 22h2 inside , user

------------------------------------------------------------------------------------------------------------
NW3DDESINGER#HPZ820#3D DESIGNER#LUMION#3DMAMX UNBOXING GIGABIT RTX 3060 12GB(INSTALLED HP Z820 WORKSTATION)SMOOTH WORKING- BEST FOR GAMES&LUMION SPECIFICATION: Graphics Processing GeForce RTX™ 3060 Core Clock 1837 MHz (Reference Card: 1777 MHz) CUDA® Cores 3584 Memory Clock 15000 MHz Memory Size ...
HP Recommended

OK thanks, it worked fine with the double 6-pin to single 8-pin adaptor! I couldn't find if they were connected to different rails but I took 6-pin cables number 1 and 3 so I guess they must... 

 

BTW I also had to cut a bit of plastic as the form factor of my card didn't fit very well in the HP case, but appart from that all seems to work fine now!

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