---
product_id: 6158509
title: "ACP-EP Memory 256MB PC133 168-PIN SDRAM DIMM (MAC and PC)"
brand: "addon"
price: "$35.04"
currency: USD
in_stock: true
reviews_count: 8
category: "Add On"
url: https://www.desertcart.us/products/6158509-acp-ep-memory-256mb-pc133-168-pin-sdram-dimm-mac
store_origin: US
region: United States of America
---

# 133MHz PC133 speed 256MB capacity 168-pin DIMM form factor ACP-EP Memory 256MB PC133 168-PIN SDRAM DIMM (MAC and PC)

**Brand:** addon
**Price:** $35.04
**Availability:** ✅ In Stock

## Summary

> 💻 Upgrade your retro rig — because classics deserve a second wind!

## Quick Answers

- **What is this?** ACP-EP Memory 256MB PC133 168-PIN SDRAM DIMM (MAC and PC) by addon
- **How much does it cost?** $35.04 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/6158509-acp-ep-memory-256mb-pc133-168-pin-sdram-dimm-mac)

## Best For

- addon enthusiasts

## Why This Product

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

## Key Features

- • **Legacy Power Boost:** Revive vintage desktops with a reliable 256MB memory upgrade.
- • **Tested & Guaranteed:** 100% tested for flawless performance and system compatibility.
- • **Speed Meets Stability:** Optimized PC133 SDRAM ensures smooth multitasking on older systems.
- • **Budget-Friendly Upgrade:** Unlock new life for your classic machine without breaking the bank.
- • **Plug & Play Compatibility:** 168-pin DIMM designed to fit seamlessly in both Mac and PC desktops.

## Overview

The ACP-EP Memory 256MB PC133 168-PIN SDRAM DIMM is a JEDEC-standard desktop memory module designed for older computers requiring PC133 speed and 168-pin DIMM slots. Fully tested and guaranteed compatible, it offers an affordable and reliable way to boost performance on legacy systems, making vintage machines responsive and functional again.

## Description

AO16C3264-PC133 is an INDUSTRY STANDARD 256MB SDRAM 133MHz/PC133 DIMM memory module for Desktops. This memory module is built to JEDEC Standards. All Add-on memory products are 100% tested and 100% guaranteed to be compatible with the systems it is intended for.

Review: Inexpensive memory upgrade for older computer - You can't find this product in a brick and mortar store. It's actually amazing to me that you can find it anywhere, let alone at such a low price. I don't imagine that these cards are even manufactured any more. Amazingly, these cards are available at less than ten dollars each including S&H. I bought two of these for an old computer and have had no problems. The product came about a week earlier than promised, and it runs fine. I ran a memory test to make sure they were OK. All the tests passed with no errors found. My Linux OS now has spare memory. These chips are for older computers, like those that came with floppy disks. Make sure that your computer takes the 168 pin PC100 or PC133 product and that it can handle at most a 256MB chip. If your computer can take the larger memory card, you should get the bigger card. I'm pretty sure all PC133 cards can run at 100MHz as well as 133Mhz, so that shouldn't be an issue. Note that the S&H is more than the cost of the chip. Either make sure that this product is the one you want, or be willing to risk getting something you can't use. There doesn't seem to be much point in returning it if it's not what your computer can use.
Review: Excellent Buy and Solid Results - The memory arrived VERY quickly and easily fit the extra memory slot of an old 256MB HP Vectra that had been limited (by a stroke of amazing HP engineering) to a total of 512MB. Antivirus programs had been making the computer unusable for up to the 15 minutes after booting that it took to load and install updates. Now the desktop is responsive within 15 to 20 seconds after it appears. What had been a slow and barely single tasking XP machine became a passable web browser and word processor. The video refreshes and scroll rates of web pages are very fluid and smooth. An antique that was headed for the recycle bin was restored to full use. Great improvement for ten bucks!

## Features

- 256MB PC-133MHZ UDIMM
- DR COMPUTER MEMORY

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0000510CF |
| Best Sellers Rank | #2,983 in Computer Memory |
| Customer Reviews | 4.5 4.5 out of 5 stars (57) |
| Date First Available | September 4, 1973 |
| Is Discontinued By Manufacturer | Yes |
| Item Weight | 0.8 ounces |
| Item model number | AO16C3264-PC133 |
| Language | English |
| Manufacturer | MEMORY UPGRADES |
| Product Dimensions | 1 x 1 x 1 inches |

## Product Details

- **Brand:** AddOn
- **Compatible Devices:** Desktop
- **Computer Memory Size:** 0.25 GB
- **Memory Speed:** 133 MHz
- **RAM Memory Technology:** SDRAM PC133

## Images

![ACP-EP Memory 256MB PC133 168-PIN SDRAM DIMM (MAC and PC) - Image 1](https://m.media-amazon.com/images/I/51YxJGpitAL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Inexpensive memory upgrade for older computer
*by R***K on May 1, 2012*

You can't find this product in a brick and mortar store. It's actually amazing to me that you can find it anywhere, let alone at such a low price. I don't imagine that these cards are even manufactured any more. Amazingly, these cards are available at less than ten dollars each including S&H. I bought two of these for an old computer and have had no problems. The product came about a week earlier than promised, and it runs fine. I ran a memory test to make sure they were OK. All the tests passed with no errors found. My Linux OS now has spare memory. These chips are for older computers, like those that came with floppy disks. Make sure that your computer takes the 168 pin PC100 or PC133 product and that it can handle at most a 256MB chip. If your computer can take the larger memory card, you should get the bigger card. I'm pretty sure all PC133 cards can run at 100MHz as well as 133Mhz, so that shouldn't be an issue. Note that the S&H is more than the cost of the chip. Either make sure that this product is the one you want, or be willing to risk getting something you can't use. There doesn't seem to be much point in returning it if it's not what your computer can use.

### ⭐⭐⭐⭐⭐ Excellent Buy and Solid Results
*by G***N on January 11, 2012*

The memory arrived VERY quickly and easily fit the extra memory slot of an old 256MB HP Vectra that had been limited (by a stroke of amazing HP engineering) to a total of 512MB. Antivirus programs had been making the computer unusable for up to the 15 minutes after booting that it took to load and install updates. Now the desktop is responsive within 15 to 20 seconds after it appears. What had been a slow and barely single tasking XP machine became a passable web browser and word processor. The video refreshes and scroll rates of web pages are very fluid and smooth. An antique that was headed for the recycle bin was restored to full use. Great improvement for ten bucks!

### ⭐⭐⭐⭐⭐ Great price on a great product
*by W***R on July 28, 2013*

I wish these could have been gotten with free shipping, that cost was more than the product cost. Even with the shipping costs added, the price for this memory was lower than I could find elsewhere. I got the stick in the mail, well packaged inside a static free plastic sleeve, inside a bubblewrap ball. I looked at the contacts and could find no scratches- it looked to be new. I popped this onto my computer motherboard, cranked it up and I was going in seconds. My older computer actually uses PC100 memory, but the PC133 memory will work just fine (but it will operate at the slower speed). I just finished installing a new OS, now my old computer is ready to go a few more years.

## Frequently Bought Together

- ACP-EP Memory 256MB PC133 168-PIN SDRAM DIMM (MAC and PC)
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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-01-31*