Intel

Intel Pentium III 866MHz SL4CB NEW NOS Socket 370 256KB 133MHz CPU

Bottom line: The Intel Pentium III 866MHz SL4CB NEW NOS Socket 370 256KB 133MHz CPU is a specs-and-price decision rather than a crowd-consensus one in the retro cpus category. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.

Live pricing on eBay

As an Amazon Associate, SpecPicks earns from qualifying purchases. Full disclosure →

🛒 Search current eBay listings Compare to similar retro cpus

By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-09-25

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 →

Before you buy

Confirm socket / form-factor / power-rating compatibility against your build before ordering
Used and vintage listings vary by seller and condition — check the listing photos, description and return terms before buying

Manufacturer description

New (Other) – New old stock Description: Intel Pentium III 866MHz Processor – NEW Old Stock Specifications: • 866MHz • 256KB L2 Cache • 133MHz FSB • 1.7V • S-Spec SL4CB • Made in Costa Rica Condition: New old stock. Never installed. Pins are straight and intact. Stored in anti-static packaging. Perfect for retro Windows 98 / early 2000s builds or collectors. Carefully packaged for safe shipping.

SpecPicks Verdict

SpecPicks scored Intel Pentium III 866MHz SL4CB NEW NOS Socket 370 256KB 133MHz CPU using a rating × review-volume × price-fit model applied to published specs and reviews across the retro cpus category. Intel's retro cpus 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 retro cpus 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.

Full Specifications

s_spec	SL4CB
fsb_mhz	133
l2_cache_kb	256
clock_speed_mhz	866

Benchmark data for other processors

Ready to buy?

Intel Pentium III 866MHz SL4CB NEW NOS Socket 370 256KB 133MHz CPU 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. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

See live eBay listings →