Samsung 2GB DDR2 RAM PC2-6400 240-Pin DIMM Major/3rd

Name: Samsung 2GB DDR2 RAM PC2-6400 240-Pin DIMM Major/3rd
Brand: Unbranded
SKU: B0050D6KXI
Price: 34.94 USD
Availability: InStock

Bottom line: The Samsung 2GB DDR2 RAM PC2-6400 240-Pin DIMM Major/3rd ($34.94 on Amazon as of 2026-10-06): Samsung part M378T5663EH3-CF7 makes matching existing sticks simple; main trade-off: unbuffered only, so it won't work in registered or FB-DIMM servers.

$34.94

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By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-06

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference. About the author →

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

Pros & Cons

Pros

✓ Samsung part M378T5663EH3-CF7 makes matching existing sticks simple
✓ Full DDR2-800 (PC2-6400) speed at CL6 timings
✓ Standard 1.8V DDR2 voltage, no BIOS overvolting needed
✓ 2GB per stick: a pair reaches 4GB, the 32-bit OS ceiling
✓ Dual-rank 2Rx8 layout with 16 chips in 128x8 organization

Cons

✗ Unbuffered only, so it won't work in registered or FB-DIMM servers
✗ Seller warranty covers just 90 days
✗ DDR2 240-pin keying won't fit DDR3 or DDR4 slots
✗ 2GB density caps a 4-slot board at 8GB total

Manufacturer description

If you're reviving a DDR2-era desktop or finishing a retro PC build, this Samsung 2GB DDR2 RAM module is a common, easy-to-identify upgrade. It is Samsung part number M378T5663EH3-CF7, a 240-pin unbuffered DIMM rated for DDR2-800, also listed as PC2-6400, at CL6 timings. The module runs at the standard 1.8V DDR2 voltage, so you don't need to raise the voltage in the BIOS. It uses a dual-rank 2Rx8 layout: 16 memory chips in a 128x8 organization. That is a common configuration for desktop DDR2 sticks, which makes it easier to pair with modules you already have. With 2GB per stick, two modules…

SpecPicks Verdict

SpecPicks scored Samsung 2GB DDR2 RAM PC2-6400 240-Pin DIMM Major/3rd using a rating × review-volume × price-fit model applied to published specs and reviews across the memory & ram category. Compare with similarly-priced alternatives in the memory & ram category before committing. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for memory & ram of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

What exact Samsung part number is this DDR2 module?

It is Samsung M378T5663EH3-CF7, a 2GB DDR2-800 (PC2-6400) 240-pin unbuffered DIMM with CL6 timings. You can search that part number on your motherboard maker's memory support list to confirm compatibility.

Will this RAM work in my DDR3 or DDR4 motherboard?

No. This is a DDR2 240-pin DIMM. DDR3 and DDR4 slots are keyed differently, so the module will not physically fit. You need a board with DDR2 DIMM slots.

Is this memory ECC or registered for servers?

It is an unbuffered DIMM, and its 16-chip 128x8 layout points to non-ECC desktop memory. It is not meant for servers or workstations that need registered or fully buffered memory.

What voltage and timings does this module run at?

It is rated for DDR2-800 at CL6 with a standard 1.8V DDR2 operating voltage, so most DDR2 desktop boards can run it without manual voltage changes.

What warranty comes with this Samsung DDR2 RAM?

The listing states a 90-day warranty. Check the product listing for the seller's current return and replacement terms.

Key Features

Manufacturer: Samsung
Part Number: M378T5663EH3-CF7
Model Number:
90 days warranty
SKU: PR24071

Full Specifications

SKU	PR24071
Brand	Samsung
Voltage	1.8 Volts
RAM Size	2 GB
Model Name	PC2-6400
Form Factor	DIMM
Part Number	M378T5663EH3-CF7
Manufacturer	Samsung
Memory Speed	800 MHz
Model Number	M378T5663EH3-CF7
Number of Pins	240
Mfr Part Number	M378T5663EH3-CF7
Memory Generation	DDR2
Compatible Devices	Desktop
Data Transfer Rate	800 MHz
Memory Form Factor	DIMM
Additional Features	Light Weight
Computer Memory Size	2 GB
RAM Memory Technology	DDR2
Column Address Strobe Latency	6

Ready to buy?

Samsung 2GB DDR2 RAM PC2-6400 240-Pin DIMM Major/3rd is vintage hardware; the used and vintage market on eBay carries most of the live inventory. Prices and condition vary by seller and move in real time, so we link the live listing rather than quote a cached price. It also has an Amazon listing — check it for current price and availability. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.