I wonder which type of RAM which supports HP Elitebook 820 G4. Is it 19200/2400 or 21300/2666

[Lonjher]

I have a HP brand Laptop which refers to HP Elitebook 820 G4 and have a plan of upgrading the RAM. I wonder what kinda type of RAM that it support, is it 19200/2400 or 21300/2666

[Samrit26]

Hello,

The HP EliteBook 820 G4 uses Intel 7th-generation (Kaby Lake) Core processors and supports DDR4 SODIMM memory, but only up to a certain specification due to chipset limits.

Here’s the full technical breakdown:

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Memory Specifications — HP EliteBook 820 G4

Specification	Detail
Memory Type	DDR4 SDRAM (SODIMM, non-ECC, 260-pin)
Supported Speeds	2133 MT/s (DDR4-2133, PC4-17000)
Maximum Capacity	32 GB total (2 × 16 GB modules)
Memory Channels	Dual Channel
Slots	2 accessible SODIMM slots
Voltage	1.2 V
Error Correction	Non-ECC only

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Clarifying the speed numbers

You mentioned:

• PC4-19200 / DDR4-2400

• PC4-21300 / DDR4-2666

Here’s what applies:

• The 820 G4 will not run 2666 MHz (PC4-21300) at full speed — the Intel chipset (QM175) and CPU memory controller cap out at 2133 MHz (PC4-17000).

• You can install faster RAM (DDR4-2400 or DDR4-2666); it will simply downclock to 2133 MHz automatically.

So if DDR4-2133 isn’t available, DDR4-2400 or DDR4-2666 modules will work fine — they’ll just operate at 2133 MHz.

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Recommended configuration

• 2 × 8 GB DDR4-2133 SODIMM (for 16 GB total, dual channel).

• Or 2 × 16 GB DDR4-2133/2400 SODIMM (for 32 GB total).

Best practice: use matched modules (same brand, size, and speed) for optimal dual-channel performance.

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Example compatible parts

• Kingston KVR21S15D8/8 — 8 GB DDR4-2133 SODIMM

• Crucial CT8G4SFS8213 — 8 GB DDR4-2133 SODIMM

• Crucial CT16G4SFD824A — 16 GB DDR4-2400 SODIMM (will run at 2133 MHz)

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Summary:
Your EliteBook 820 G4 supports DDR4-2133 MHz SODIMM (PC4-17000) RAM, dual-channel, up to 32 GB total.
Higher-speed DDR4-2400 or 2666 modules are compatible but will downclock to 2133 MHz.