HP All-in-One 21-b0xxx
All-in-one, from 2021 2 hardware reports
Memory
Up to 8 GB
1 laptop-size slot
Drives and power
Coming next
Checked from separate sources
Only 2 machines reported so far, so this answer rests on few examples. Check the label or open the panel before you buy.
Upgradable
Yes. One slot, up to 8 GB seen working.
It takes DDR4-2400 laptop-size sticks (SO-DIMM).
- Slots
- 1 SO-DIMM slot
- Type
- DDR4-2400 260-pin SO-DIMM
- Most seen working
- 8 GB in two or more machines
- Firmware says
- 16 GB maximum (often wrong, so we show what machines run)
- How sure
- 2 of 2 reports show this layout
See 8 GB DDR4-2400 SO-DIMM on AmazonOpens an Amazon search for this exact spec.
Worked out from 2 hardware reports of this desktop. Sources and method. Updated 9 Nov 2026.
1 laptop-size slot
Illustration Questions
Can I upgrade the RAM in the HP All-in-One 21-b0xxx?
Yes. One slot, up to 8 GB seen working. It takes DDR4-2400 laptop-size sticks (SO-DIMM).
What type of RAM does the HP All-in-One 21-b0xxx use?
DDR4-2400 laptop-size sticks (SO-DIMM, 260-pin).
How much RAM can the HP All-in-One 21-b0xxx take?
Machines in the reports run up to 8 GB. The firmware reports a maximum of 16 GB, a figure that is often wrong.
Is this my desktop?
Check the model name on the front or the label of the case. It should read All-in-One 21-b0xxx.