HP EliteBook 840 G3
Yes. 2 slots, up to 32 GB seen working.
It takes DDR4-2133 laptop-size sticks (SO-DIMM).
- Slots
- 2 SO-DIMM slots
- Type
- DDR4-2133 260-pin SO-DIMM
- Most seen working
- 32 GB in two or more machines
- Firmware says
- 32 GB maximum
- How sure
- 154 of 154 reports show this layout
Worked out from 154 hardware reports of this laptop. Sources and method. Updated 10 Nov 2026.
Check the drive you have.
The reports don't show this model's drive type yet. Look at the drive in it: a 2.5-inch box, about 7 by 10 cm, is SATA. A small stick is M.2, and its label says NVMe or SATA and its length (2230, 2242 or 2280).
- Drive type
- Check your current drive
How to tell a drive's type. Sources and method. Updated 10 Nov 2026.
Illustration Batteries in these laptops report 47 Wh.
That is the design capacity the batteries themselves report, and the label can read 1 to 3 Wh higher. Other pack sizes may have shipped, so check the capacity printed on yours before you order.
- Capacity
- 47 Wh
- Pack code
- CS03046XL
From 130 battery readings. Sources and method. Updated 10 Nov 2026.
Illustration Match the label on your charger.
We don't have this model's charger rating yet. The label on your charger shows it: the output line gives volts and amps, and volts times amps is the watts (19.5 V at 3.33 A is 65 W). Buy one with the same plug, the same voltage and at least as many watts.
- Rated output
- On your charger's label
How to read a charger label. Sources and method. Updated 10 Nov 2026.
Illustration Questions
Can I upgrade the RAM in the HP EliteBook 840 G3?
Yes. 2 slots, up to 32 GB seen working. It takes DDR4-2133 laptop-size sticks (SO-DIMM).
What type of RAM does the HP EliteBook 840 G3 use?
DDR4-2133 laptop-size sticks (SO-DIMM, 260-pin).
How much RAM can the HP EliteBook 840 G3 take?
Machines in the reports run up to 32 GB. That matches the 32 GB maximum the firmware reports.
What battery does the HP EliteBook 840 G3 use?
Batteries in these laptops report 47 Wh. The pack code is CS03046XL. Check the capacity printed on yours before you order.
Is this my laptop?
Check the model name on the label underneath. It should read EliteBook 840 G3.