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Two black DDR5 sticks with matte heat spreaders side by side

Crucial

Crucial CP2K16G64C32U5B 32GB (2 x 16GB) DDR5 6400 desktop RAM

SKU CH-HB8Z-NDTK5 MPN CP2K16G64C32U5B

Dual-channel 32GB DDR5 kit running at 6400MT/s with CL32 latency and 1.35V operation

  • Total capacity32 GB (2 × 16 GB)
  • Rated speedDDR5 6400 (PC5 51200)
  • CAS latencyCL32
  • Memory timings32-40-40-103
  • Rated voltage1.35 V
  • Buffer typeUnbuffered / Unregistered

Capacity 32GB (2 x 16GB)

Speed DDR5 6400 (PC5 51200)

CAS Latency · Color CL32Black

  • Low-latency CL32 timing speeds up game response
  • 6400 MT/s DDR5 bandwidth handles multitasking smoothly
  • Dual-channel 2 x 16 GB kit maximises throughput
  • 35 V operation keeps thermals in check
  • Intel XMP 3.0 and AMD EXPO profiles simplify setup

32GB DDR5 6400 dual-channel kit

This 32GB kit contains two 16GB unbuffered DDR5 modules rated at 6400 MT/s with CL32 timings. It is built for desktop systems that support Intel XMP 3.0 or AMD EXPO profiles. The black heat spreader helps manage thermals during extended sessions.

Sustained load behaviour at 1.35V

At the specified 1.35V the modules maintain their 32-40-40-103 timings without dropping to lower speeds. The dual-channel layout keeps bandwidth stable when all cores are active, so frame rates stay consistent during long gaming or streaming workloads.

Deciding spec: CL32 at DDR5 6400

The combination of 6400 MT/s data rate and CAS latency 32 determines whether this kit matches your platform's sweet spot. If your motherboard and CPU can run that frequency at CL32, the kit delivers its rated low-latency performance; otherwise it will fall back to slower JEDEC defaults.

How it compares

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

Price $330.99
Pricier than about 77% of the 3,647 comparable items (median $90.99).
Total capacity 32 GB (2 × 16 GB)
Higher than about 70% of the 3,251 comparable items (median 16 GB).
Price per GB $10.34 per GB
Pricier than about 68% of the 3,251 comparable items (median $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 nameCrucial
Product linePro Overclocking
Model nameCP2K16G64C32U5B
Part numberCP2K16G64C32U5B
Total capacity32 GB (2 × 16 GB)
Product colorBlack
Performance
Rated speedDDR5 6400 (PC5 51200)
Memory
CAS latencyCL32
Memory timings32-40-40-103
ECC supportNo
Buffer typeUnbuffered / Unregistered
Kit configurationDual Channel Kit
Memory profilesIntel XMP 3.0 and AMD EXPO
Heat spreaderYes
Power
Rated voltage1.35 V
Size & build
Shipping weight0.09 kg
Package size184 × 95 × 6 mm
Compatibility
Recommended forAMD & Intel Compatible / AMD 500 Series / AMD 600 Series / AMD B550 / AMD B650 / AMD B850 / AMD Ryzen Compatible / AMD X570 / High Performance or Gaming Memory / Intel 600 Series / Intel 700 Series / Intel B560 / Intel B660 / Intel B670 / Intel B760 / Intel Compatible / Intel Z590 / Intel Z690 / Intel Z790 / Intel Z890
More details
LED lightingNone

Other versions of this model

5 more in the same range

Questions about this item

Will this 32 GB kit run at 6400 MT/s on an AMD B650 board with a Ryzen CPU?

The kit carries an AMD EXPO profile for 6400 MT/s at CL32-40-40-103 and 1.35 V, so a B650 board with a Ryzen processor can enable that speed in BIOS.

Does the motherboard need to support Intel XMP 3.0 to reach the rated speed?

Yes, on Intel 600- or 700-series boards the XMP 3.0 profile sets 6400 MT/s, CL32 timings and 1.35 V automatically once enabled.

Can I add a second identical kit later for 64 GB total?

The modules are unbuffered, non-ECC UDIMMs; adding a second matching kit is possible if the motherboard has four slots and supports the combined load at 6400 MT/s.

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