Core i9-9940X vs Ryzen 7 5800X3D

CPU

GPU

Core i9-9940X

14 Cores28 Thrd165 WWMax: 4.5 GHz2018

Similar parts

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Ryzen 7 5800X3D

8 Cores16 Thrd105 WWMax: 4.5 GHz2022

Ryzen family

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Core i9-9940X vs Ryzen 7 5800X3D Performance Spectrum

Core i9-9940X

14 / 28

28,088

0.0%

28,298

+0.7%

Ryzen Embedded V2718

Ryzen 3 PRO 8300GE

Ryzen Threadripper 1920

Ryzen 7 8840HS

Ryzen 9 7845HX

Ryzen 9 9955HX3D

Ryzen Threadripper 3990X

Ryzen Threadripper PRO 9965WX

About PassMark

PassMark CPU Mark evaluates processor speed through complex mathematical computations. It provides a reliable metric to compare multi-core performance, where higher scores indicate faster processing for multitasking, gaming, and heavy workloads.

Core i9-9940X vs Ryzen 7 5800X3D FPS Benchmarks

Predicted gaming performance across popular games. Tested paired with GeForce RTX 5090 to isolate CPU performance.

Search any supported game below to compare 1080p FPS for both components.

Core i9-9940X vs Ryzen 7 5800X3D: Pros, Cons & Final Verdict

See where each CPU makes more sense in practice: gaming, heavier work, platform cost, power draw, and upgrade path.

Core i9-9940X

2018

Why buy it

✅83.3% more PCIe lanes (44 vs 24) for storage and expansion-heavy builds.

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen 7 5800X3D across 50 shared CPU benchmark tests.
❌Lower PassMark (28,088 vs 28,298).
❌Lower PassMark per dollar, at 20.3 vs 63.0 PassMark/$ ($1,387 MSRP vs $449 MSRP).
❌57.1% higher power demand at 165W vs 105W.

Ryzen 7 5800X3D

2022

Why buy it

✅Better for gaming: +12.8% higher average FPS across 50 shared CPU benchmark tests.
✅Costs $938 less on MSRP ($449 MSRP vs $1,387 MSRP).
✅Delivers 211.2% more PassMark for each dollar spent, at 63.0 vs 20.3 PassMark/$ ($449 MSRP vs $1,387 MSRP).
✅Draws 105W instead of 165W, a 60W reduction.

Trade-offs

❌Fewer obvious downsides in this matchup outside of normal market pricing swings.

Quick Answers

So, is Ryzen 7 5800X3D better than Core i9-9940X?

Yes. Ryzen 7 5800X3D is the better all-around CPU here. It gives you a 12.8% average FPS lead across 50 shared CPU game tests in our data, 0.7% better PassMark, and the stronger long-term platform, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Ryzen 7 5800X3D is the better pick. According to our tests, it delivers 12.8% more average FPS across 50 shared CPU game tests. It also has a clear cache advantage at 96 MB versus 19 MB.

Which one is better for streaming, content creation, and heavy multitasking?

For streaming, content creation, and heavier multitasking, Ryzen 7 5800X3D is the stronger fit. You are getting 0.7% better PassMark, backed by 8 cores and 16 threads. It also has the larger cache pool with 398.7% larger total L3 cache (96 MB vs 19 MB).

Which one is the smarter buy today, not just the cheaper CPU?

Ryzen 7 5800X3D is the better buy right now. Ryzen 7 5800X3D comes in $938 cheaper on MSRP at $449 MSRP versus $1,387 MSRP, and it still gives you a 12.8% average FPS lead across 50 shared CPU game tests in our data. It is also 211.2% better value on MSRP (63.0 vs 20.3 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

Which one is more future-proof for 2026 and beyond?

Ryzen 7 5800X3D makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2022 vs 2018), 3D V-Cache and a much larger 96 MB L3 cache instead of 19 MB, and more multi-core headroom with 8 cores / 16 threads instead of 14/28. That extra cache should keep paying off in CPU-limited games and high-refresh builds.

Core i9-9940X vs Ryzen 7 5800X3D Technical Specifications

Side-by-side specs, architecture details, clocks, memory, power, and platform differences.

Core i9-9940X

The Core i9-9940X is manufactured by Intel. It was released in 19 October 2018 (7 years ago). It is based on the Skylake (server) (2017−2018) architecture. It features 14 cores and 28 threads. Base frequency is 3.3 GHz, with boost up to 4.5 GHz. L3 cache: 19.25 MB (total). L2 cache: 1 MB (per core). Built on 14 nm process technology. Socket: LGA2066. Thermal design power (TDP): 165 Watt. Memory support: DDR4-2666. Passmark benchmark score: 28,088 points. Launch price was $1,387.

Ryzen 7 5800X3D

The Ryzen 7 5800X3D is manufactured by AMD. It was released in 20 April 2022 (3 years ago). It is based on the Vermeer (Zen3) (2020−2022) architecture. It features 8 cores and 16 threads. Base frequency is 3.4 GHz, with boost up to 4.5 GHz. L3 cache: 96 MB (total). L2 cache: 512 kB (per core). Built on 7 nm, 12 nm process technology. Socket: AM4. Thermal design power (TDP): 105 Watt. Memory support: DDR4-3200. Passmark benchmark score: 28,298 points. Launch price was $449.

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Processing Power

The Core i9-9940X packs 14 cores / 28 threads, while the Ryzen 7 5800X3D offers 8 cores / 16 threads — the Core i9-9940X has 6 more cores. Boost clocks reach 4.5 GHz on the Core i9-9940X versus 4.5 GHz on the Ryzen 7 5800X3D — identical boost frequencies (base: 3.3 GHz vs 3.4 GHz). The Core i9-9940X uses the Skylake (server) (2017−2018) architecture (14 nm), while the Ryzen 7 5800X3D uses Vermeer (Zen3) (2020−2022) (7 nm, 12 nm). In PassMark, the Core i9-9940X scores 28,088 against the Ryzen 7 5800X3D's 28,298 — a 0.7% lead for the Ryzen 7 5800X3D. L3 cache: 19.25 MB (total) on the Core i9-9940X vs 96 MB (total) on the Ryzen 7 5800X3D.

Feature	Core i9-9940X	Ryzen 7 5800X3D
Cores / Threads	14 / 28+75%	8 / 16
Boost Clock	4.5 GHz	4.5 GHz
Base Clock	3.3 GHz	3.4 GHz+3%
L3 Cache	19.25 MB (total)	96 MB (total)+399%
L2 Cache	1 MB (per core)+100%	512 kB (per core)
Process	14 nm	7 nm, 12 nm-50%
Architecture	Skylake (server) (2017−2018)	Vermeer (Zen3) (2020−2022)
PassMark	28,088	28,298

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Memory & Platform

The Core i9-9940X uses the LGA2066 socket (PCIe 3.0), while the Ryzen 7 5800X3D uses AM4 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2666 on the Core i9-9940X versus DDR4-3200 on the Ryzen 7 5800X3D — the Ryzen 7 5800X3D supports 20% faster memory, which can translate to measurable gains in memory-sensitive workloads. Both support up to 128 GB of RAM. Memory channels: 4 (Core i9-9940X) vs 2 (Ryzen 7 5800X3D). PCIe lanes: 44 (Core i9-9940X) vs 24 (Ryzen 7 5800X3D) — the Core i9-9940X offers 20 more lanes for additional GPUs or NVMe drives.

Feature	Core i9-9940X	Ryzen 7 5800X3D
Socket	LGA2066	AM4
PCIe Generation	PCIe 3.0	PCIe 4.0+33%
Max RAM Speed	DDR4-2666	DDR4-3200+20%
Max RAM Capacity	128 GB	128 GB
RAM Channels	4+100%	2
ECC Support	No	Yes
PCIe Lanes	44+83%	24

🔧

Advanced Features

Virtualization: VT-x, VT-d (Core i9-9940X) / not specified (Ryzen 7 5800X3D). Primary use case: Core i9-9940X targets Workstation.

Feature	Core i9-9940X	Ryzen 7 5800X3D
Integrated GPU	No	No
Unlocked	Yes	—
AVX-512	Yes	—
Virtualization	VT-x, VT-d	—
Target Use	Workstation	—

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Value Analysis

At launch, the Core i9-9940X was priced at $1387, while the Ryzen 7 5800X3D came in at $449. On launch pricing ($1387 vs $449), Ryzen 7 5800X3D was $938 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core i9-9940X delivers 20.3 pts/$ vs 63.0 pts/$ for the Ryzen 7 5800X3D — making the Ryzen 7 5800X3D the 102.7% better value option.

Feature	Core i9-9940X	Ryzen 7 5800X3D
MSRP	$1387	$449-68%
Performance per Dollar	20.3	63.0+210%
Release Date	2018	2022

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