What are the alternatives to the Intel Core 2 Quad Q8400 Processor 2.66 GHz 4 MB Cache Socket LGA775?

Intel Core 2 Quad Q8400 Processor 2.66 GHz 4 MB Cache Socket LGA775 competes with other Retro CPUs products on SpecPicks. Use our Compare tool to view specs side-by-side, or browse the full Retro CPUs category for alternatives.

Intel Core 2 Quad Q8400 Processor 2.66 GHz 4 MB Cache Socket LGA775

Name: Intel Core 2 Quad Q8400 Processor 2.66 GHz 4 MB Cache Socket LGA775
Brand: Unbranded
SKU: B002654FQM
Price: 48.02 USD
Availability: InStock

By Mike Perry, Hardware Editor · Verified 2026-09-15

Mike Perry has researched PC hardware since 2014, tracking 80+ GPU generations, 50+ retro handheld platforms, and 30+ vintage PC configurations. He synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides. View full credentials →

$48.02

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🛒 See live eBay price Also on Amazon — View Current Price → Compare to similar retro cpus

*Price sourced from Amazon.com. Price and availability subject to change.

Bottom line: The Intel Core 2 Quad Q8400 Processor 2.66 GHz 4 MB Cache Socket LGA775 is a specs-and-price decision rather than a crowd-consensus one in the retro cpus category, priced around $48.02. Check the specification table above against one or two close alternatives — on price and spec fit, not on star ratings.

Product DescriptionIntel Core 2 Quad Processor Q8400 2.66GHz 1333MHz 4MB LGA775 CPU, RetailFrom the ManufacturerThe Intel Core 2 Quad Q8400 brings four computing cores running at 2.66 GHz in a single processor for the ultimate in efficiency and performance. It features 4 MB of L2 cache and a 1333 MHz front side bus, and it uses the LGA775 socket for wide compatibility with motherboards. The processor features Intel's 45nm architecture and delivers multimedia experiences with greater speed and responsiveness. With the Q8400, demanding users can now accomplish more in less time.Stunning…

SpecPicks Verdict

SpecPicks scored Intel Core 2 Quad Q8400 Processor 2.66 GHz 4 MB Cache Socket LGA775 using a rating × review-volume × price-fit model applied to our editorial and benchmark analysis across the retro cpus category. Compare with similarly-priced alternatives in the retro cpus category before committing. 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 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

✓ Model Name - Core 2 Quad
✓ 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

Key Features

Model Name - Core 2 Quad
Socket Type - Socket 775
Front Side Bus Speed - 1333 MHz
Clock Speed - 2.66 GHz
Thermal - 95W

Full Specifications

Brand	Intel
Wattage	95
Platform	Windows 10
CPU Model	Core 2 Quad
CPU Speed	2.66 GHz
CPU Socket	LGA 775
Model Number	BX80580Q8400
Mfr Part Number	BX80580Q8400
Number of Items	1
Processor Brand	Intel
Processor Count	4
Processor Speed	2.66 GHz
Secondary Cache	4 MB
CPU Manufacturer	Intel
Processor Series	Core 2 Quad
Processor Socket	LGA 775
Processor Core Count	4
Cache Memory Installed Size	4
Global Trade Identification Number	00735858208888
Processor Number of Concurrent Threads	8

Ready to buy?

Intel Core 2 Quad Q8400 Processor 2.66 GHz 4 MB Cache Socket LGA775 is sold on the used and vintage market, where eBay carries the live inventory — Amazon does not stock this part. 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.

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*Price sourced from Amazon.com. Price and availability subject to change.