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Green rectangular circuit board with gold edge connector and black memory chips

OWC

OWC 8S5D32R804GB 4GB DDR3 1066 CL7 2Rx8 204-pin 1.5V Non-ECC SODIMM memory upgrade

SKU CH-S45K-ZMDXP

A 4GB DDR3 1066 CL7 SODIMM upgrade for compatible Lenovo ThinkPad T400, T400s, T410i, T410s, T410si, T500 and T510i laptops

  • Total capacity4 GB
  • Rated speedDDR3 1066 (PC3 8500)
  • CAS latencyCL7
  • Rated voltage1.5 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8
  • 4 GB capacity lets you run more apps simultaneously
  • DDR3 1066 CL7 timing keeps latency low for snappy response
  • 204-pin SODIMM fits Lenovo ThinkPad T400, T400s, T410i, T410s, T410si, T500, T510i
  • 5 V JEDEC-standard voltage ensures stable, warranty-safe operation
  • Non-ECC unbuffered design installs easily with no configuration needed

Capacity & Form Factor

This OWC module is a 4GB DDR3 SODIMM built to the 204-pin SO-DIMM standard. It runs at 1066 MHz with PC3-8500 bandwidth and CL7 latency at 1.5V, using an unbuffered 2Rx8 non-ECC design without a heat spreader. The stick is validated for Lenovo ThinkPad T400, T400s, T410i, T410s, T410si, T500 and T510i models.

Who It Suits

Owners of the listed ThinkPad laptops who need a single 4GB DDR3 1066 SODIMM to restore or expand system memory will find this module a direct fit. It meets JEDEC and RoHS standards for a warranty-safe upgrade. Buyers whose laptops require ECC, registered DIMMs, higher speeds, or capacities beyond 4GB per slot cannot use this part.

Deciding Specification

The memory uses DDR3 technology at 1066 MHz with a 204-pin SO-DIMM form factor. Only systems that accept DDR3 PC3-8500 non-ECC SODIMMs at 1.5V can install this module. Verify your laptop's memory generation and pin count before purchase.

How it compares

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

Price $19.99
Cheaper than about 91% 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 $5.00 per GB
Cheaper than about 77% 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 number8S5D32R804 GB
Total capacity4 GB
Product type204-Pin DDR3 Non-ECC SODIMM
Performance
Rated speedDDR3 1066 (PC3 8500)
Memory
CAS latencyCL7
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsLenovo ThinkPad T400
Lenovo ThinkPad T400s
Lenovo ThinkPad T410i
Lenovo ThinkPad T410s
Lenovo ThinkPad T410si

Other versions of this model

5 more in the same range

Questions about this item

Does the OWC 8S5D32R804GB module ship alone or with any extra parts such as a screwdriver or thermal pad?

The package contains a single 4GB DDR3 1066 CL7 2Rx8 204-pin 1.5V Non-ECC SODIMM module. No tools, screws or thermal pads are included.

My ThinkPad T410i has two slots — should I buy one 4GB stick or two for 8GB total?

Each stick is 4GB. Installing two modules gives 8GB and enables dual-channel bandwidth on T410i, T410s, T510i and the other listed models.

The spec says PC3-8500 1066 CL7 — will that actually run at 1066 MHz inside a T400s?

Yes. The module is JEDEC-standard DDR3 1066 (PC3-8500) CL7 at 1.5V, so the T400s memory controller will operate it at its rated 1066 MHz speed.

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