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Eight black DDR4 UDIMM sticks without heat spreaders

OWC

OWC 64GB (8x8GB) DDR4 2666MHz CL19 desktop RAM

SKU CH-5FHB-VNXPB

Eight 8 GB DDR4 2666 MHz CL19 modules totalling 64 GB for desktop upgrades

  • Total capacity64 GB (8 × 8 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Kit configurationDual Channel Kit
  • 64 GB capacity with eight 8 GB modules for heavy multitasking
  • DDR4 2666 MHz speed rated at PC4-21300 for responsive performance
  • CL19 latency at 1.2 V for efficient operation
  • 288-pin unbuffered non-ECC design fits standard desktop DIMM slots
  • Backward compatible with 2133 MHz and 2400 MHz systems

Capacity and fit

This kit delivers 64GB of DDR4 memory across eight 8GB unbuffered UDIMM modules. It targets desktop PCs, workstations and NAS systems that need a large, single-channel upgrade. Each stick runs at 2666MHz with a CL19 latency and operates at the standard 1.2V JEDEC voltage. The 288-pin form factor fits any board that accepts DDR4 UDIMMs.

Thermals and power

The modules carry no heat spreader, relying on case airflow to keep temperatures in check during normal desktop workloads. At the rated 1.2V the kit draws only the power required by the JEDEC DDR4 baseline, so it adds minimal heat to the system. With no LEDs or active cooling the memory runs silently in typical office or creative applications.

Sustained load behaviour

Under prolonged heavy use the sticks maintain their 2666MHz CL19 timing because they are validated to the full JEDEC PC4-21300 specification. Backward compatibility with 2133MHz and 2400MHz platforms means the kit will down-clock cleanly if the motherboard cannot support the top speed. The eight-module population fills most consumer boards completely, so sustained bandwidth stays consistent across all populated channels.

How it compares

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

Price $396.99
Pricier than about 81% of the 3,647 comparable items (median $90.99).
Total capacity 64 GB (8 × 8 GB)
Higher than about 90% of the 3,251 comparable items (median 16 GB).
Price per GB $6.20 per GB
Cheaper than about 56% of the 3,251 comparable items (median $6.75 per GB).

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Specifications

Product
Brand nameOWC
Part number2U6D41R8064K
Total capacity64 GB (8 × 8 GB)
Product colorBlack
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportNo
Buffer typeUnbuffered
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Recommended forDesktops
More details
LED lightingNone

Questions about this item

How do I install the 288-pin UDIMM modules and what step is often missed?

Align the notch on each 288-pin UDIMM with the slot key, press straight down until both side clips click, then verify the BIOS shows all 64GB at 2666MHz; the step often missed is seating every module fully so both clips engage.

What maintenance or replacement will the 8x8GB kit need later?

The unbuffered non-ECC DDR4 modules have no moving parts and require no scheduled maintenance; replacement is only needed if a module fails, which is covered by the limited lifetime warranty.

What limit appears first under sustained use with CL19 2666MHz DDR4?

The CAS latency of CL19 at 2666MHz sets the timing ceiling; under heavy sustained loads the memory controller will hit this latency bound before voltage or thermal limits become a factor.

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