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Two green DDR2 SODIMM sticks with black chips, no heat spreader

Computer Memory Solutions

Computer Memory Solutions CM512646400SO 8GB (2x4GB) DDR2 800MHz SODIMM memory upgrade

SKU CH-N1K6-5A5KX

8 GB kit of two 4 GB DDR2 800 MHz SODIMM modules for Lenovo ThinkPad X61 notebooks

  • Total capacity8 GB (2 × 4 GB)
  • Rated speedDDR2 800 (PC2 6400)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL6
  • Memory timings6-6-6
  • Rated voltage1.8 V
  • 8GB dual-channel kit expands X61 memory capacity
  • 800MHz DDR2 speed matches original system specification
  • 200-pin SODIMM form factor fits ThinkPad X61 slots
  • CL6 latency timing optimises data access cycles
  • 8V operation matches notebook voltage requirements

DDR2 800MHz SODIMM kit for ThinkPad X61

This 8GB kit contains two 4GB DDR2 800 (PC2 6400) SO-DIMM modules built to 200-pin form factor with CL6 timing and 1.8V operation. It is designed as a direct memory upgrade for the IBM Lenovo ThinkPad X61 notebook series. The unbuffered, non-ECC modules use major brand chipsets and ship as a matched pair.

Suits X61 owners needing the full 8GB on a 64-bit OS

The kit works with ThinkPad X61 models 7673, 7674, 7675, 7676, 7678 and 7679 running a 64-bit operating system that can address the full 8GB. On a 32-bit OS the system will recognise only 3.0GB to 3.5GB, so buyers staying on 32-bit Vista or XP gain little usable capacity. It is not for laptops that use a different pin count or voltage, nor for desktops requiring full-size DIMMs.

The decisive spec is DDR2 800 (PC2 6400) 200-pin

Only systems that accept DDR2 800MHz SO-DIMMs at 1.8V with 200 pins can use this kit. The ThinkPad X61 chipset limits total memory to 8GB across two sockets, so this matched pair fills the platform maximum. If the service manual specifies a different speed, pin count or voltage, the modules will not fit or will not post.

How it compares

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

Price $100.99
Cheaper than about 68% of the 21,161 comparable items (median $397.99).
Total capacity 8 GB (2 × 4 GB)
Lower than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $12.62 per GB
Pricier than about 58% 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 nameComputer Memory Solutions
Model nameCM512646400SO
Total capacity8 GB (2 × 4 GB)
Product type200-Pin DDR2 SO-DIMM
Performance
Rated speedDDR2 800 (PC2 6400)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL6
Memory timings6-6-6
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.8 V
Compatibility
Compatible systemsIbm Lenovo Thinkpad X61 Notebook
In the box
Included items2 Memory RAM Sticks

Questions about this item

What comes in the CM512646400SO package and is anything else needed for installation?

The box contains two 4 GB DDR2 800 MHz SODIMM modules, giving 8 GB total. No extra parts are required; the sticks fit directly into the ThinkPad X61 memory slots.

Should I choose this 2×4 GB kit or a different capacity for my ThinkPad X61?

This 8 GB kit (2×4 GB) fills both SODIMM sockets in the ThinkPad X61 models 7673, 7674, 7675, 7676, 7678 and 7679. A 64-bit OS is needed to use the full 8 GB; a 32-bit OS will only see about 3 GB to 3.5 GB.

What does the PC2-6400 rating mean once the modules are installed in the X61?

PC2-6400 identifies DDR2 running at 800 MHz with CL6 timing (6-6-6) at 1.8 V, delivering the standard bandwidth for that speed grade in the ThinkPad X61.

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