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

Side-by-side comparison of 2 CPU parts: Ryzen 7 5800X vs Ryzen 9 3900X. Release years: 2019, 2020. MSRP range: $449 · $499. Specs, synthetic benchmarks, AI inference tok/s, and Amazon availability — click into any column header for the per-SKU benchmark page.

AMD · Zen 3

Ryzen 7 5800X

8 cores105W TDP$449 MSRP2020

Full Ryzen 7 5800X benchmarks →

AMD

Ryzen 9 3900X

12 cores105W TDP$499 MSRP2019

Full Ryzen 9 3900X benchmarks →

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

Where to buy

Current in-stock pricing for each part on Amazon.

AMD Ryzen 7 5800X 3.8GHz 32MB L3 Processor

Amazon$405

Specs side-by-side

Spec	Ryzen 7 5800X	Ryzen 9 3900X
cores	8	12
threads	16	24
base clock ghz	—	3.8
boost clock ghz	4.7	4.6
tdp w	105	105
l3 cache mb	32	64
process nm	—	7
socket	AM4	AMD Socket AM4

Synthetic benchmarks

Higher is better. Per-row scores come from public benchmark databases (PassMark, TechPowerUp, Geekbench, Cinebench). Empty cells mean we don't yet have that benchmark on file for the SKU.

Benchmark	Ryzen 7 5800X	Ryzen 9 3900X
Cinebench R23 multi	15,228 points	18,682 points
Cinebench R23 single	1,596 points	1,312 points
Geekbench 6 multi	10,282 points	9,259 points
Geekbench 6 single	2,174 points	1,682 points
PassMark CPU Mark	27,679 points	32,491 points
PassMark Single Thread	—	2,702 points
PassMark Single Thread Rating	—	2,702 points
PassMark Single-Thread	3,448 points	—
Y-cruncher 1B	32	—
Y-cruncher Pi 1B	—	89 seconds
Y-cruncher Pi-1B	32 seconds	—

AI inference (tokens/sec)

Top community-reported tokens-per-second results for popular LLMs. See the per-SKU benchmark page for the full set including quantization, prompt length, and source citations.