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HP ENVY 27-inch All-in-One Desktop PC - Best practices for memory upgrades to prevent 'Unsupported memory populations' error

Follow these recommendations to upgrade the HP ENVY 27-inch All-in-One Desktop PC memory and prevent errors, such as an 'Unsupported memory populations' error or blinking LEDs.

Error messages and alerts

You might hear beeps or see error messages when you restart the computer after installing memory modules. If you encounter the following, you might need to reinstall the memory using best practices.

The computer won't start, but the power LED blinks and you hear three long beeps and two short beeps.
When you turn the computer on, the BIOS displays the following unsupported memory populations error message, and then the computer turns off.

HP ENVY BIOS unsupported memory error message

Memory installation recommendations

Before you install memory modules, review these recommendations.

Make sure that you are installing memory modules that have the correct part number for the HP ENVY 27-inch All-in-One Desktop PC.

Note:

The only memory modules supported are listed in the table.

Memory module part numbers
Memory module size	Part numbers
HP 8 GB DDR5	5S4C3AA
HP 16 GB DDR5	5S4C4AA
HP 32 GB DDR5	5S4C0AA

Make sure that all memory modules are the same part number, brand, model, and rank.
Make sure that you install each memory module in the correct dual in-line memory module (DIMM) slot on the system board.

Note:
Install either two or four memory modules at a time. You cannot install only one or three memory modules, because those configurations are not supported.
- If you are installing two memory modules, install them in slot DIMM1 (B) and slot DIMM1 (D).
- If you are installing four memory modules, install them in slot DIMM0 (A), slot DIMM1 (B), slot DIMM0 (C), and slot DIMM1 (D).

For more information, see HP Desktop PCs - Upgrading memory (RAM) (Windows) and the following video:

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