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Green circuit board with gold edge connector and black memory chips

OWC

OWC 4GB DDR3 1333 CL9 2Rx8 204-pin SODIMM ThinkPad T420 T510 T520

SKU CH-EDZD-F4J94

4GB DDR3 1333 CL9 SODIMM module upgrades compatible Lenovo ThinkPad T420, T510 and T520 series laptops

  • Total capacity4 GB
  • Rated speedDDR3 1333 (PC3 10600)
  • CAS latencyCL9
  • Rated voltage1.5 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8
  • 4GB DDR3 1333 CL9 boosts multitasking on ThinkPad T420 T510 T520
  • 204-pin SODIMM fits T420 T420i T420s T420si T510 T520 T520i
  • 5V JEDEC PC3-10600 standard ensures warranty-safe upgrade
  • 2Rx8 unbuffered non-ECC module tested to exceed OEM specs
  • Single 4GB stick installs easily for DIY performance gain

Single-module upgrade

This OWC SODIMM adds 4GB of DDR3 memory at 1333 MT/s with CL9 latency. It is built to JEDEC standard 1.5 V and uses a 2Rx8 unbuffered non-ECC layout on a 204-pin stick. The module is validated for the ThinkPad T420, T420i, T420s, T420si, T510, T520 and T520i.

Who this suits

Owners of the listed ThinkPads who want a straightforward capacity increase without changing voltage or timing parameters. Buyers needing ECC error correction, registered buffering, speeds above 1333 MT/s or capacities beyond 4 GB per slot should look elsewhere.

Deciding specification

The 204-pin DDR3 SODIMM form factor at 1.5 V and 1333 MT/s CL9 is the single attribute that determines fit; the laptop must accept exactly this pin count, voltage and speed grade for the module to work.

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 number1S3D32R804 GB
Total capacity4 GB
Product type204-Pin DDR3 Non-ECC SODIMM
Performance
Rated speedDDR3 1333 (PC3 10600)
Memory
CAS latencyCL9
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsLenovo ThinkPad T420
Lenovo ThinkPad T420i
Lenovo ThinkPad T420s
Lenovo ThinkPad T420si
Lenovo ThinkPad T510

Other versions of this model

5 more in the same range

Questions about this item

How can I verify the 4GB DDR3 1333 CL9 module is running at PC3-10600 speed after installing it in my ThinkPad T420?

Open Task Manager or CPU-Z in Windows, or run dmidecode in Linux, and confirm the memory tab shows DDR3-1333 (PC3-10600) at CL9 with 1.5V and 2Rx8 organisation.

What comes in the box and do I need any extra parts to fit this SODIMM into a T520?

The box contains one OWC 4GB 204-pin DDR3 SODIMM (part 1S3D32R804GB); no tools, brackets or additional cables are required for installation in any listed ThinkPad.

Should I choose the 4GB 2Rx8 version or look for a different capacity for my T420s?

This specific upgrade is a single 4GB 2Rx8 module; if your T420s has two slots and you want 8GB total, buy two of these identical modules for matched-pair operation.

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