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Two green DDR4 DIMM sticks, 288-pin, no heat spreader

Crucial

Crucial CT2K32G4DFD8266 64GB (2x32GB) DDR4 2666 CL19 desktop RAM

SKU CH-NGDC-XKDHX MPN CT2K32G4DFD8266

A 64 GB dual-channel DDR4 kit running at 2666 MT/s with CL19 latency and 1.20 V operation

  • Total capacity64 GB (2 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Kit configurationDual Channel Kit
  • 64GB dual-channel kit doubles capacity for demanding workloads
  • DDR4 2666 speed delivers 21300 MT/s bandwidth for responsive performance
  • CL19 latency keeps data access quick and efficient
  • 20V operation cuts power draw by up to 40%
  • Unbuffered 288-pin DIMMs install straight into standard desktop slots

64GB Dual-Channel DDR4 Kit

This 64GB kit contains two 32GB DDR4 DIMMs rated at 2666 MT/s with CL19 latency. The unbuffered, non-ECC modules run at 1.20V and fit standard 288-pin desktop slots. It suits builders who need high capacity for memory-intensive workloads on platforms that support DDR4.

No Heat Spreader Included

The green modules ship without a heat spreader, so they occupy minimal vertical space inside the case. Buyers who prefer active cooling can add aftermarket spreaders or rely on chassis airflow. This design also keeps the kit compatible with large CPU coolers that overhang the first memory slot.

DDR4 2666 Standard Limits

The JEDEC DDR4 2666 specification caps the data rate at 2666 MT/s and defines PC4-21300 bandwidth. Speeds up to 3200 MT/s are noted as future expectations for the technology, not a guarantee for this kit. Systems that only support lower DDR4 speeds will downclock the modules automatically. Builders needing ECC or registered memory must choose a different product.

How it compares

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

Price $191.99
Pricier than about 67% of the 3,647 comparable items (median $90.99).
Total capacity 64 GB (2 × 32 GB)
Higher than about 90% of the 3,251 comparable items (median 16 GB).
Price per GB $3.00 per GB
Cheaper than about 91% of the 3,251 comparable items (median $6.75 per GB).

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Specifications

Product
Brand nameCrucial
Model nameCT2K32G4DFD8266
Total capacity64 GB (2 × 32 GB)
Product type288-Pin PC RAM
Product colorGreen
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportNo
Buffer typeUnbuffered
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.2 V
Size & build
Shipping weight0.07 kg
Package size175 × 89 × 6 mm

Questions about this item

Will the dual-channel kit need any firmware updates or component replacements over its lifetime?

The unbuffered DDR4 modules have no heat spreader and no moving parts, so no firmware updates or component replacements are expected.

What limit appears first when the 64 GB kit runs at 2666 MT/s continuously?

The CAS latency of CL19 sets the timing boundary before bandwidth or voltage limits are reached.

How much heat and power will the 1.20 V modules produce during all-day operation?

Operating at 1.20 V, the kit reduces power consumption by up to 40 % compared with earlier DDR4 designs, keeping heat output low.

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