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Green circuit board with black memory chips, 288 gold contacts, no heat spreader

Computer Memory Solutions

Computer Memory Solutions 4GB DDR4 2666 CL19 2Rx8 memory upgrade

SKU CH-7Z84-EFC9R

4GB DDR4 2666 CL19 DIMM validated for ASRock A320, B360 and Fatal1ty X470/Z370 boards

  • Total capacity4 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL19
  • Memory timingsUnbuffered
  • Rated voltage19-19-19
  • 4GB DDR4 2666 MHz module expands system memory for everyday tasks
  • CL19 latency at 2666 MHz delivers responsive performance for standard workloads
  • 2Rx8 rank configuration on a single 288-pin DIMM fits compatible motherboards
  • Validated for ASRock A320M, B360M and Fatal1ty X470/Z370 boards for reliable operation
  • Non-ECC unbuffered design runs at 1.2 V for broad platform compatibility

4GB DDR4 2666 module for ASRock boards

This single 4GB DDR4 2666 stick is built for the listed ASRock motherboards including the A320M-DVS R4.0, B360M-HDV, B360M-ITX/ac, Fatal1ty X470 Gaming-ITX/ac and Fatal1ty Z370 Gaming-ITX. It runs at 1.2V with CL19 timing in a 2Rx8 unbuffered layout. The 288-pin DIMM carries a major-brand chipset and no heat spreader.

Replaces a missing or slower DDR4 stick

Adding this module upgrades a system that has an empty slot or a lower-speed DDR4 DIMM installed. The board supports up to 32GB across two sockets so the jump is worth it when you need more capacity for a 64-bit operating system or want matched-pair performance. All memory will run at the speed of the slowest module or the processor limit.

Suits owners of the named ASRock models

Builders with one of the compatible ASRock boards who need a single 4GB DDR4 2666 DIMM can use this kit. Buyers who need more than 32GB total capacity or who want a factory-matched pair for dual-channel operation should look at a different kit. Systems limited to 32-bit operating systems cannot address more than 4GB regardless of installed memory.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $16.99
Cheaper than about 93% of the 21,161 comparable items (median $397.99).
Total capacity 4 GB
Lower than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $4.25 per GB
Cheaper than about 83% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameNo
Model name288-Pin DDR4 SDRAM
Total capacity4 GB
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL19
Memory timingsUnbuffered
ECC support4 GB
Buffer typeDDR4 2666 (PC4 21300)
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage19-19-19
Compatibility
Compatible systemsASRock Motherboard A320M-DVS R4.0, B360M-HDV, B360M-ITX/ac, Fatal1ty X470 Gaming-ITX/ac, Fatal1ty Z370 Gaming-ITX
In the box
Included items1 Memory RAM Stick

Questions about this item

Does the 288-pin DDR4 DIMM fit the ASRock B360M-HDV motherboard?

The module is a 288-pin DDR4 DIMM and the supplier lists the B360M-HDV among the compatible ASRock boards.

What BIOS setting or slot order is often missed when installing this 2666 MHz stick?

Install the stick in the primary DIMM slot first; if the board defaults to a lower speed, enable the XMP or DOCP profile in BIOS to reach 2666 MHz.

When should the 4 GB module be replaced if the system later needs more than 32 GB total?

The supported platform maximum is 32 GB across two sockets, so the 4 GB stick would need to be swapped once the workload exceeds that limit.

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