AddOn

ACP-EP Memory 512MB PC133 168-PIN SDRAM DIMM (MAC and PC)

Name: ACP-EP Memory 512MB PC133 168-PIN SDRAM DIMM (MAC and PC)
Brand: AddOn
SKU: B00006BA9U
Price: 34.99 USD
Availability: InStock

Bottom line: The AddOn ACP-EP Memory 512MB PC133 168-PIN SDRAM DIMM ($34.99 on Amazon as of 2026-10-06): 512MB PC133 SDRAM in a single 168-pin DIMM slot; main trade-off: 168-pin DIMM only, so no DDR or SO-DIMM board fits it.

$34.99

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🛒 See live eBay price Also on Amazon — $34.99 Compare to similar memory & ram

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

✓ 512MB PC133 SDRAM in a single 168-pin DIMM slot
✓ Works in both Mac and PC desktops on one part number
✓ 10ns burst timing for contiguous reads
✓ Backed by a lifetime warranty

Cons

✗ 168-pin DIMM only, so no DDR or SO-DIMM board fits it
✗ PC133 speed caps bandwidth versus later memory standards
✗ Some older chipsets ignore density above 256MB per slot
✗ AddOn is a third-party module, not an OEM-branded stick

Manufacturer description

MEMORY 512MB VALUESELECT VS512MB266, 86SD03

SpecPicks Verdict

SpecPicks scored AddOn ACP-EP Memory 512MB PC133 168-PIN SDRAM DIMM using a rating × review-volume × price-fit model applied to published specs and reviews across the memory & ram category. AddOn's memory & ram lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. 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.

Key Features

512 MB SDRAM memory upgrade
168 pin DIMM; PC133 speed
This desktop memory is both MAC and PC compatible
This allows SDRAM to burst the second and subsequent, contiguous characters at a rate of 10ns
Lifetime warranty

Full Specifications

Brand	AddOn
Voltage	3.3 Volts
RAM Size	0.5 GB
Model Name	VALUESELECT
Form Factor	DIMM
Memory Speed	133 MHz
Compatibility	PC, Mac
Number of Pins	168
Compatible Devices	Desktop
Data Transfer Rate	133 MHz
Additional Features	Lightweight
Computer Memory Size	0.5 GB
RAM Memory Technology	sdram
Global Trade Identification Number	00662919001723

Ready to buy?

ACP-EP Memory 512MB PC133 168-PIN SDRAM DIMM (MAC and PC) 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.