Intel
Pentium P166 MMX SL239 Socket 7 166Mhz CPU A80503166
*Price sourced from Amazon.com. Last updated 2026-05-26. Price and availability subject to change.
Bottom line: The Pentium P166 MMX SL239 Socket 7 166Mhz CPU A80503166 is a niche pick — read recent reviews before buying in the retro cpus category. Read recent reviews carefully before committing.
A80503166 is an OEM/tray microprocessor. A80503166 + + + + + + + +. Q064 Q0940 Q126 Q975 SL239 SL26V SL27K SL27X. If you build a Socket 5 or Socket 7 system, this is your point of reference. It was tested in a Socket 7 mainboard and is working fine.
SpecPicks Verdict
SpecPicks classifies Intel Pentium P166 MMX SL239 Socket 7 166Mhz CPU A80503166 as a niche pick — read recent reviews before buying in the retro cpus category, based on limited Amazon review volume so far and our ranking model that weights rating × review-volume × price-fit. Intel's positioning sits within the broader category mid-tier. Use the Compare tool to put it side-by-side with two or three close alternatives before clicking through to Amazon.
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 Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.
Pros & Cons
Pros
- ✓ Backed by Intel's warranty and support channels
- ✓ Ships via Amazon with Prime eligibility and the standard returns policy
Cons
- ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
- ✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified
Full Specifications
| mmx | true |
|---|---|
| core_count | 1 |
| part_number | A80503166 |
| clock_speed_mhz | 166 |
Ready to buy?
Intel Pentium P166 MMX SL239 Socket 7 166Mhz CPU A80503166 is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-05-26. Price and availability subject to change.
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