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Green circuit board with black memory chips and gold edge connector

OWC

OWC 4GB DDR3 1600 CL11 240-pin 1.5V UDIMM Alienware X51 R2

SKU CH-K663-80B6K

A 4 GB DDR3 1600 CL11 240-pin 1.5 V UDIMM built for the Alienware X51 R2

  • Total capacity4 GB
  • Rated speedDDR3 1600 (PC3 12800)
  • CAS latencyCL11
  • Rated voltage1.5 V
  • Buffer typeUnbuffered
  • Memory rank1Rx8
  • Boosts Alienware X51 R2 responsiveness with a 4 GB DDR3 1600 module
  • JEDEC-standard build ensures warranty-safe upgrade for the desktop
  • CL11 latency at 1.5 V delivers stable speed for multitasking
  • Unbuffered 240-pin UDIMM fits the X51 R2 slot without adapters
  • Single 1Rx8 rank simplifies installation for a quick DIY upgrade

Single-module DDR3 upgrade

This OWC module adds 4 GB of DDR3 1600 memory to an Alienware X51 R2. It is a non-ECC, unbuffered UDIMM built to JEDEC PC3-12800 CL11 specifications. The stick is designed as a direct, warranty-safe upgrade for that specific system.

Check your current configuration

Verify that your X51 R2 has a free 240-pin DIMM slot and that the existing memory also runs at 1.5 V. The module is single-ranked 1Rx8, so mixing with dual-ranked sticks may affect channel population rules. Ensure the platform accepts non-ECC unbuffered DDR3 before ordering.

Thermals and power in daily use

Operating at the standard 1.5 V JEDEC voltage, the module draws minimal power and runs without a heat spreader. In normal desktop workloads it stays cool and silent, adding no audible noise to the system. The low thermal load fits the compact X51 R2 chassis without requiring extra airflow.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $17.99
Cheaper than about 92% of the 21,161 comparable items (median $397.99).
Total capacity 4 GB
Lower than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $4.50 per GB
Cheaper than about 81% of the 20,941 comparable items (median $8.19 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 nameOWC
Part number1U6D31R804 GB
Total capacity4 GB
Product type240-Pin DDR3 Non-ECC UDIMM
Performance
Rated speedDDR3 1600 (PC3 12800)
Memory
CAS latencyCL11
ECC supportNo
Buffer typeUnbuffered
Memory rank1Rx8
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsAlienware X51 R2

Other versions of this model

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Questions about this item

Does the 4GB DDR3 1600 module ship as a single stick or a kit, and are any tools or extra parts needed for installation?

The upgrade consists of one 4GB DDR3 1600 PC3-12800 CL11 1Rx8 240-pin 1.5V Non-ECC UDIMM. No tools or additional parts are required; it installs directly into the Alienware X51 R2 memory slot.

Why choose the 4GB CL11 1.5V version instead of a higher-capacity or lower-latency DDR3 module?

This specific 4GB CL11 1.5V UDIMM matches the Alienware X51 R2 OEM specification exactly, ensuring JEDEC-standard compatibility and a warranty-safe upgrade without BIOS changes.

What real-world difference will the PC3-12800 1600MHz rating make once the module is seated in the X51 R2?

The 1600MHz CL11 module restores the factory memory bandwidth, allowing the system to open more applications and larger files simultaneously with smoother multitasking responsiveness.

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