---
product_id: 24860664
title: "Compatible 128MB 100-pin Memory Upgrade for HP LaserJet 1320 2300 2505 2550 2605 2700 2820 2840 3390 3392 4100 4200 4300 5100 8150 9000 (p/n C9121A, Q9121A, Q7709A)"
brand: "keystron"
price: "$31.42"
currency: USD
in_stock: true
reviews_count: 8
url: https://www.desertcart.us/products/24860664-compatible-128mb-100-pin-memory-upgrade-for-hp-laserjet-1320
store_origin: US
region: United States of America
---

# 128MB high-speed memory 100-pin PC100 SODIMM interface Lifetime replacement warranty Compatible 128MB 100-pin Memory Upgrade for HP LaserJet 1320 2300 2505 2550 2605 2700 2820 2840 3390 3392 4100 4200 4300 5100 8150 9000 (p/n C9121A, Q9121A, Q7709A)

**Brand:** keystron
**Price:** $31.42
**Availability:** ✅ In Stock

## Summary

> ⚡ Supercharge your HP LaserJet — print faster, work smarter!

## Quick Answers

- **What is this?** Compatible 128MB 100-pin Memory Upgrade for HP LaserJet 1320 2300 2505 2550 2605 2700 2820 2840 3390 3392 4100 4200 4300 5100 8150 9000 (p/n C9121A, Q9121A, Q7709A) by keystron
- **How much does it cost?** $31.42 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/24860664-compatible-128mb-100-pin-memory-upgrade-for-hp-laserjet-1320)

## Best For

- keystron enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last:** Backed by a lifetime replacement warranty—because your productivity deserves zero downtime.
- • **Compact Powerhouse:** Ultra-lightweight and sleek 2x2 inch form factor fits discreetly without bulk.
- • **Seamless Compatibility:** Engineered to perfectly fit a wide range of HP LaserJet models, ensuring hassle-free installation.
- • **Plug & Play Performance:** 100-pin PC100 SODIMM design guarantees quick setup and reliable operation every time.
- • **Boost Your Printer's Brainpower:** Upgrade your HP LaserJet with 128MB of lightning-fast memory for smoother, faster printing.

## Overview

This 128MB PC100 100-pin SODIMM memory upgrade is fully compatible with multiple HP LaserJet models, offering a compact, reliable, and lifetime-warrantied solution to enhance your printer’s speed and efficiency.

## Description

Compatible with HP LaserJet 1320, 2300, 2505, 2550, 2605, 2700, 2820, 2840, 3390, 3392, 4100, 4200, 4300, 5100, 8150, 9000 printer

## Features

- One 128MB PC100 100-pin sodimm
- Part#: C9121A, Q9121A, Q7709A
- 100% compatible with lifetime replacement warranty

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Keystron, LLC |
| Brand | Keystron |
| Item Weight | 1 ounces |
| Product Dimensions | 2 x 2 x 0.3 inches |
| Item model number | C9121A, Q9121A, Q7709A |
| Is Discontinued By Manufacturer | No |
| Number of Items | 1 |
| Size | 128 Mb |
| Manufacturer Part Number | 4328385936 |

## Product Details

- **Brand:** Keystron
- **Computer Memory Size:** 128 MB
- **RAM Memory Technology:** SDRAM
- **Compatible Devices:** Printer
- **Special Feature:** Lightweight

## Images

![Compatible 128MB 100-pin Memory Upgrade for HP LaserJet 1320 2300 2505 2550 2605 2700 2820 2840 3390 3392 4100 4200 4300 5100 8150 9000 (p/n C9121A, Q9121A, Q7709A) - Image 1](https://m.media-amazon.com/images/I/71Z02N45DPL._AC_UL320_.jpg)
![Compatible 128MB 100-pin Memory Upgrade for HP LaserJet 1320 2300 2505 2550 2605 2700 2820 2840 3390 3392 4100 4200 4300 5100 8150 9000 (p/n C9121A, Q9121A, Q7709A) - Image 2](https://m.media-amazon.com/images/I/71Z02N45DPL._AC_UL480_FMwebp_QL65_.jpg)
![Compatible 128MB 100-pin Memory Upgrade for HP LaserJet 1320 2300 2505 2550 2605 2700 2820 2840 3390 3392 4100 4200 4300 5100 8150 9000 (p/n C9121A, Q9121A, Q7709A) - Image 3](https://m.media-amazon.com/images/I/71Z02N45DPL._AC_UL640_FMwebp_QL65_.jpg)
![Compatible 128MB 100-pin Memory Upgrade for HP LaserJet 1320 2300 2505 2550 2605 2700 2820 2840 3390 3392 4100 4200 4300 5100 8150 9000 (p/n C9121A, Q9121A, Q7709A) - Image 4](https://m.media-amazon.com/images/I/71Z02N45DPL._AC_UL800_FMwebp_QL65_.jpg)
![Compatible 128MB 100-pin Memory Upgrade for HP LaserJet 1320 2300 2505 2550 2605 2700 2820 2840 3390 3392 4100 4200 4300 5100 8150 9000 (p/n C9121A, Q9121A, Q7709A) - Image 5](https://m.media-amazon.com/images/I/71Z02N45DPL._AC_UL960_FMwebp_QL65_.jpg)

## Questions & Answers

**Q: On my hp 4200, i have killed my 64mb ram trying to add a 48mb ram. do you confirm this 128mb can replace my dead ram on my laserjet hp4200 ?**
A: It should.  Just try not to get it killed again :)

**Q: Hp 4100 has 4 slots. manual says not to remove lowest slot 1. it's 16 mb. why? this keeps me from putting in full 256 mb.**
A: HP incorporates and stores software need by the printer in a portion of the first memory module. Removing this module or placing in a slot other than 1 will make the printer inoperable in most models.

**Q: mpc akai 1000 compatable??**
A: No.  The correct item is at listing below,
https://www.amazon.com/dp/B00SYQ4VD4

**Q: Where is additional memory for an hp laserjet 4200 / 4300 printer installed or where would i get a diagram of this particular printer? thanks!**
A: Mine is an HP 2300. But if you go to Youtube and search "HP 4300 memory" bunch of instructions come up.

## Customer Reviews

### ⭐⭐⭐⭐⭐ A no-brainer upgrade for my HP LaserJet - easy and inexpensive
*by J***O on April 8, 2015*

This is great - I wish I'd done it earlier. After my printer was slow on a big job recently I decided to look for a memory upgrade. HP sells one for $143! This one is less than $10 including shipping and works perfectly. My printer is a LaserJet Wireless 1320 NW but the memory is listed for lots of others. Installing was simple. HP has great instructions with pictures on their web site. Step 1) turn it off and disconnect the power and cables. Step 2) open the print cartridge drawer. Step 3) Open the left side - it has clips at the top and bottom on the paper tray end and sort of swivels at the print cartridge end. Step 4) My machine only had its 16MB built in memory (leaving only 5MB for documents) so there was no DIMM to remove. Step 5) Turn the little cams that latch the DIMM in place to their open position. Step 6) Take the new DIMM out of its antistatic bag, holding it by the ends between your thumb and a finger. Touch your other hand to the metal of the printer to discharge, and push the DIMM into its slot making sure it is aligned properly. You can tell which way up it should go because the gold terminals are grouped and the slots are grouped the same way. It may not seem to go in at first because when you push it in it moves the cams into closed position and that takes a tiny shove. Step 7) Close up the printer, plug it in, turn it on and you are all set for fast printing of large or complex documents.

### ⭐⭐⭐⭐⭐ Brand new printer memory that works well !
*by E***R on February 2, 2023*

Printer memory arrived promptly and was packaged well. Brand new, factory sealed anti-static bag. Within 5 minutes, my HP Laserjet 1320 was back up and running with 144MB of memory which is the maximum. After upgrade, my printer is notably faster in terms of time to print first page and the interval between printing pages.

### ⭐⭐⭐⭐ Great memory. Works fine.
*by D***1 on September 19, 2016*

I haven't had any problems with the memory card. It came packaged well. I installed it with the printer turned off. I turned the printer on and it found the additional memory with no problem. Unfortunately, I don't know if it sped things up. I don't notice a difference so far. But I'm glad I got the product and now the printer memory is fully populated.

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-05*