HP Z820 6 times beep error Sapphire R9 390X

[z820-2021]

Hi there,

I hope I will find an answer here in this community. I have a HP Z820 and I am trying to boot my systeem with a newly installed Saphhire R9 390X (already tried every PCIe slot in the Z820). When I boot the system it is beeping 6 times, indicating something is wrong with the card or the motherboard. The card is working fine in another system (and I have reseated it in this system a dozen times) and the mobo is running fine with other cards. 

Anybody has an idea?

Regards

Z820

[DGroves]

the R9 390x can pull well over 300 watts, which is more than the stock 800 watt supply can handle, to use this card you require the upgraded 11200 watt supply which has three 6 pin gpu connectors on TWO SEPERATE gpu power rails

the stock 800 watt supply has only two 6 pin GPU connectors which are both on the same power rail

unlike most consumer power supplies which are single rail designs, the z workstations use a "multirail" design which means it's possible to overload one of the rails (gpu in this case) while being under the limit on the other rails

https://www8.hp.com/h20195/v2/getpdf.aspx/c04111526.pdf

[Brian1965]

Hi Z820-2021,

The Z820 supports either 3x 225W, or 2x 300W graphics cards with the 1125W PSU installed, as stated in the HP Z820 Maintenence and Service Guide. A quick check on-line would indicate that the Sapphire R9 390X is a 375W garphics card, well above the maximum recommended by HP. The HP workstation power supplies typically exceed the ATX PSU 'standard' specifications, allowing you to pull a bit more than the recommended 300W graphics card limit, e.g. a 325W graphics card should run no problem, but a 375W graphics card probably won't.

How are you providing auxilliary power to the graphics card? Does the graphics card have 2x 8-pin PCI-e connectors? Are you using HP adapter cables?

https://support.hp.com/gb-en/product/hp-z820-workstation/5225041

FYI - The HP Z820 Maintenance and Service Guide is located in the manuals section.