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Eight black DDR4 UDIMM sticks in a row

OWC

OWC 256GB (8x32GB) DDR4 2666MHz CL19 desktop RAM

SKU CH-TZFJ-3QDK1

Eight 32 GB DDR4 modules running at 2666 MHz CL19 provide 256 GB of unbuffered, non-ECC desktop memory at 1.2 V

  • Total capacity256 GB (8 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Kit configurationDual Channel Kit
  • Massive 256GB capacity across eight 32GB modules
  • 2666MHz DDR4 speed with CL19 latency for responsive multitasking
  • JEDEC and RoHS compliant for warranty-safe upgrades
  • 2V low-voltage operation reduces system power draw
  • Backward compatible with 2133MHz and 2400MHz systems

256GB DDR4 kit for desktops

This kit contains eight 32GB modules that together provide 256GB of DDR4 memory. It is built for desktop PCs, workstations and compatible NAS systems that accept 288-pin unbuffered DIMMs. The modules run at the standard 1.2V and require no ECC or registered support from the platform.

JEDEC compliance and backward compatibility

Each module meets JEDEC PC4-21300 specifications and is RoHS compliant, so the upgrade does not void the original system warranty. The memory will also operate at 2133MHz and 2400MHz if the host platform cannot run at the rated 2666MHz speed.

DDR4 2666MHz interface limits

The DDR4 interface caps the data rate at 2666MT/s with a CL19 latency at 1.2V. Higher frequencies or tighter timings are not supported by this standard, and the unbuffered design means the memory controller must drive all eight ranks directly.

How it compares

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

Price $1,439.99
Pricier than about 90% of the 3,647 comparable items (median $90.99).
Total capacity 256 GB (8 × 32 GB)
Higher than about 99% of the 3,251 comparable items (median 16 GB).
Price per GB $5.62 per GB
Cheaper than about 64% of the 3,251 comparable items (median $6.75 per GB).

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Specifications

Product
Brand nameOWC
Part number2U6D42R8256K
Total capacity256 GB (8 × 32 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

Will any of the 8 modules need individual replacement over time?

The kit is a matched set of eight 32 GB DDR4 modules tested together; if a fault appears the whole set is covered under the lifetime advanced-replacement program rather than swapping single sticks.

What limit appears first when the 256 GB kit runs at 2666 MHz continuously?

The CL19 latency at 1.2 V is the fixed timing ceiling; sustained loads stay within JEDEC DDR4 specs so no thermal or voltage throttling occurs before that timing bound.

How much heat or noise do the eight unbuffered DIMMs produce under all-day load?

With no heat spreaders and a standard 1.2 V DDR4 voltage the modules run passively and silently; total power draw stays within normal desktop memory limits.

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