---
product_id: 44103645
title: "Keystron128MB Memory Upgrade for HP Laserjet 4050 4050N 4050TN 4050T"
brand: "keystron"
price: "¥4241"
currency: JPY
in_stock: true
reviews_count: 9
url: https://www.desertcart.jp/products/44103645-keystron128mb-memory-upgrade-for-hp-laserjet-4050-4050n-4050tn-4050t
store_origin: JP
region: Japan
---

# Keystron128MB Memory Upgrade for HP Laserjet 4050 4050N 4050TN 4050T

**Brand:** keystron
**Price:** ¥4241
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** Keystron128MB Memory Upgrade for HP Laserjet 4050 4050N 4050TN 4050T by keystron
- **How much does it cost?** ¥4241 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/44103645-keystron128mb-memory-upgrade-for-hp-laserjet-4050-4050n-4050tn-4050t)

## Best For

- keystron enthusiasts

## Why This Product

- Trusted keystron brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

Keystron128MB Memory Upgrade for HP Laserjet 4050 4050N 4050TN 4050T

## Features

- About this item
- 128MB 100pin sdram HP printer memory upgrade     Part#: C9121A, Q9121A, Q7709A, KTH-LJ4100/128     100% Compatible with Lifetime Warranty     Manufactured by Keystron, LLC     Keystron is a registered trademark of Keystron, LLC

## Images

![Keystron128MB Memory Upgrade for HP Laserjet 4050 4050N 4050TN 4050T - Image 1](https://m.media-amazon.com/images/I/81Z+lSXLgnL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ 







  
  
    Inexpensive memory boost for my old HP 4050N printer.
  

*by R***. on Reviewed in the United States on March 22, 2020*

As far as I can tell it works perfectly. Easy to install - no instructions but none needed - it is quite straight-forward and there is always the internet if you need help. HP LaserJet 4050N was bogging down when trying to print some really large files. This seems to have put an end to that problem - and at a very reasonable price.

### ⭐⭐⭐⭐⭐ 







  
  
    If you still have an old 4050 work horse, you need this.
  

*by J***L on Reviewed in the United States on May 21, 2018*

I was getting memory errors while trying to print certain emails or documents. Turned out to be certain fonts. This amazingly cheap memory upgrade solved the problem.

### ⭐⭐⭐⭐⭐ 







  
  
    Great price, likely because the printer was discontinued in ...
  

*by C***T on Reviewed in the United States on August 23, 2015*

Great price, likely because the printer was discontinued in the last century (I think). That said, this RAM really boosted the speed - truly, like a brand new printer. Price was good, shipping was fast, and installation was easy. Great product.

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**Shop now:** [https://www.desertcart.jp/products/44103645-keystron128mb-memory-upgrade-for-hp-laserjet-4050-4050n-4050tn-4050t](https://www.desertcart.jp/products/44103645-keystron128mb-memory-upgrade-for-hp-laserjet-4050-4050n-4050tn-4050t)

---

*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-10-29*