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Ryzen 7 5800X vs Ryzen 9 3900X — Specs & Performance Compared

Verdict: The Ryzen 7 5800X leads on 3 of 4 shared benchmarks (29% in Cinebench R23 single); the Ryzen 9 3900X takes 1 (9% in PassMark CPU Mark).

Side-by-side CPU comparison of the Ryzen 7 5800X and the Ryzen 9 3900X. Released 2020 (Ryzen 7 5800X), 2019 (Ryzen 9 3900X). MSRP range: $449 · $499. Specs, synthetic benchmarks, AI inference tok/s, and Amazon availability below; each column header links to that part's benchmark page.

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

Where to buy

A listing for each part; the current price and stock are on the retailer's page.

Specs side-by-side

SpecRyzen 7 5800XRyzen 9 3900X
cores 812
threads 1624
base clock ghz —3.8
boost clock ghz 4.74.6
tdp w 105105
l3 cache mb 3264
process nm —7
socket AM4AMD Socket AM4

Synthetic benchmarks

Each row says whether a higher or a lower number is better (ranks and times are lower-is-better). Scores come from Tom's Hardware, CGDirector, PassMark, GadgetVersus, CpuTronic, NanoReview and HWBOT; each row links its sources, and where they differ the cell shows their median. Empty cells mean we don't yet have that benchmark on file for the SKU.

BenchmarkRyzen 7 5800XRyzen 9 3900X
Cinebench R23 multi (higher is better)
Source: Tom's Hardware, CGDirector		 28,864 pts18,682 points
Cinebench R23 single (higher is better)
Source: Tom's Hardware, CGDirector		 1,698 pts1,312 points
Geekbench 6 multi (higher is better)
Source: PassMark, GadgetVersus, CpuTronic, NanoReview		 14,141 pts9,259 points
Geekbench 6 single (higher is better)
Source: PassMark, GadgetVersus, CpuTronic, NanoReview		 2,187 pts1,682 points
PassMark CPU Mark (higher is better)
Source: PassMark		 29,840 pts32,491 points
PassMark Single Thread (higher is better)
Source: PassMark		 3,448 points2,702 points
PassMark Single Thread Rating (higher is better)
Source: PassMark		 —2,702 points
PassMark Single-Thread (higher is better)
Source: PassMark		 3,448 points—
Y-cruncher 1B (lower is better)
Source: HWBOT		 32—
Y-cruncher Pi 1B (lower is better)
Source: HWBOT		 —89 seconds
Y-cruncher Pi-1B (lower is better)
Source: HWBOT		 32 seconds—

AI inference (tokens/sec)

Top community-reported tokens-per-second results for popular LLMs whose weights fit the card's memory, each linked to its source. See the per-SKU benchmark page for the full set including quantization and prompt length.

Ryzen 7 5800X

All Ryzen 7 5800X AI benchmarks →

Ryzen 9 3900X

No verified AI inference results on file. See the Ryzen 9 3900X benchmark page →

Quick answers

Which is faster, the Ryzen 7 5800X or the Ryzen 9 3900X?

The Ryzen 7 5800X leads on 3 of 4 shared benchmarks (29% in Cinebench R23 single); the Ryzen 9 3900X takes 1 (9% in PassMark CPU Mark).

What did the Ryzen 7 5800X and the Ryzen 9 3900X cost at launch?

The Ryzen 7 5800X launched at a $449 MSRP and the Ryzen 9 3900X at $499. Street prices drift from launch pricing; the Where to buy section links current listings.

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