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Green rectangular DIMM module with black memory chips and gold contacts

SK hynix

SK hynix HMA851U6AFR6N-UH 4GB DDR4 2400 CL17 DIMM desktop RAM

SKU CH-F688-SE5EX

4 GB unbuffered DDR4 DIMM running at 2400 MT/s with CL17 latency at 1.20 V

  • Total capacity4 GB
  • Rated speedDDR4 2400 (PC4 19200)
  • CAS latencyCL17
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • 4 GB capacity for everyday desktop tasks
  • DDR4 2400 speed rated at PC4 19200
  • CL17 CAS latency for responsive operation
  • 20 V low voltage reduces power draw
  • 260-pin unbuffered DIMM fits standard desktop slots

Capacity and form factor

This is a single 4 GB DDR4 DIMM module rated for 2400 MT/s with a CL17 latency and 1.20 V operating voltage. It is an unbuffered, non-ECC stick intended for standard desktop memory slots.

Ideal for basic upgrades.

The 4 GB capacity suits everyday office work, web browsing and light multitasking on systems with free DIMM slots. Builders who need more than 4 GB per module, require error-correcting code memory, or want registered buffering should look at different modules.

Deciding spec: 4 GB capacity

The total capacity of 4 GB is the figure that determines whether this stick meets the system's memory requirement. If the target platform needs a larger single-module size, this part will not satisfy that need.

How it compares

Measured against everything we stock in Desktop RAM, at today’s prices. Recalculated every night.

Price $25.99
Cheaper than about 82% of the 3,647 comparable items (median $90.99).
Total capacity 4 GB
Lower than about 80% of the 3,251 comparable items (median 16 GB).
Price per GB $6.50 per GB
Typical for this category: the median of 3,251 items is $6.75 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 nameHynix
Product lineDesktop Memory
Model nameHMA851U6AFR6N-UH
Total capacity4 GB
Performance
Rated speedDDR4 2400 (PC4 19200)
Memory
CAS latencyCL17
ECC supportNo
Buffer typeUnbuffered
Power
Rated voltage1.2 V

Questions about this item

What comes in the box with the HMA851U6AFR6N-UH 4GB DDR4 2400 CL17 DIMM and is anything else needed to install it?

The box contains one 4GB DDR4 2400 CL17 unbuffered DIMM module. No additional components are required for installation; it plugs directly into a compatible desktop DDR4 motherboard slot.

How do I decide between the available versions or capacities of the SK hynix HMA851U6AFR6N-UH DDR4 2400 memory?

This specific model is a single 4GB module rated at DDR4 2400 with CL17 latency and 1.20V operation. Choose it when you need to add exactly 4GB to a system with an open DIMM slot.

What does the DDR4 2400 (PC4 19200) rating mean for actual performance once the HMA851U6AFR6N-UH is installed?

The module runs at 2400 MT/s with a CAS latency of 17 cycles, delivering a peak bandwidth of 19200 MB/s. Real-world speed depends on the motherboard and CPU memory controller capabilities.

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