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Green circuit board with black memory chips and gold edge connectors

A-Tech

A-Tech 4GB DDR3 1333MHz PC3-10600 240-Pin Desktop RAM

SKU CH-QP3K-02TX2

A 4 GB DDR3L desktop DIMM running at 1333 MHz with CL9 timing and 1.35 V low-voltage operation, built as a compatible replacement for HP part 638821-001

  • Total capacity4 GB
  • Rated speedDDR3L 1333(PC3L 10600)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL9
  • Tested speed1333
  • Rated voltage1.35 V
  • 4GB capacity expands multitasking headroom for everyday desktop workloads
  • DDR3L 1333MHz speed delivers responsive data throughput at PC3-10600 rating
  • Low 1.35V operation reduces power draw and heat in compatible systems
  • 240-pin unbuffered DIMM fits standard desktop memory slots without ECC overhead
  • Tested replacement for HP part 638821-001 ensures drop-in compatibility

HP 638821-001 Compatible 4GB DDR3L Module

This 4GB DDR3L DIMM is a direct replacement for HP part 638821-001. It runs at 1333MHz with a CL9 latency and operates at 1.35V low voltage. The unbuffered, non-ECC design suits standard desktop motherboards.

Fits HP Systems Using 638821-001

Owners of HP desktops specifying the 638821-001 part number can install this module without configuration changes. Builders needing ECC, registered buffering, or 1.35V-only DDR3L support on non-HP platforms should verify their board manual first.

240-Pin DDR3L 1333MHz 1.35V Specification

The 240-pin DDR3L interface at 1333MHz and 1.35V determines physical and electrical compatibility. Systems requiring 262-pin SODIMM form factors, different voltages, or higher speeds cannot use this module.

How it compares

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

Price $11.99
Cheaper than about 95% of the 3,647 comparable items (median $90.99).
Total capacity 4 GB
Lower than about 80% of the 3,251 comparable items (median 16 GB).
Price per GB $3.00 per GB
Cheaper than about 91% of the 3,251 comparable items (median $6.75 per GB).

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Specifications

Product
Brand nameA-Tech
Product lineCompatible Replacement for HP
Model name638821-001
Total capacity4 GB
Performance
Rated speedDDR3L 1333(PC3L 10600)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL9
Tested speed1333
ECC supportNo
Buffer typeUnbuffered
Heat spreaderNo
Power
Rated voltage1.35 V
Compatibility
Recommended forCompatible Replacement for HP 638821-001

Questions about this item

Will this 240-pin DDR3L module fit my standard desktop DIMM slot?

Yes, the module uses the standard 240-pin DDR3 DIMM form factor used by desktop motherboards that support DDR3 memory.

My system requires the HP 638821-001 part number — is this a direct replacement?

This module is listed as a compatible replacement for HP part number 638821-001, matching the 4 GB capacity, 1333 MHz speed and 1.35 V voltage.

Does this RAM require any special BIOS setting to run at 1333 MHz?

The module is rated for 1333 MHz at CL9 latency and 1.35 V; most desktop boards will configure these timings automatically on boot.

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