Core i9-9940X vs Ryzen 7 5800X

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

Core i9-9940X

14 / 28

28,088

+1.4%

27,712

0.0%

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 5800X 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 5800X: 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

✅+1.4% higher PassMark.
✅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 5800X across 50 shared CPU benchmark tests.
❌Smaller total L3 cache (19 MB vs 32 MB).
❌Lower PassMark per dollar, at 20.3 vs 61.7 PassMark/$ ($1,387 MSRP vs $449 MSRP).
❌57.1% higher power demand at 165W vs 105W.

Ryzen 7 5800X

2020

Why buy it

✅Better for gaming: +11.9% higher average FPS across 50 shared CPU benchmark tests.
✅+66.2% larger total L3 cache (32 MB vs 19 MB).
✅Costs $938 less on MSRP ($449 MSRP vs $1,387 MSRP).
✅Delivers 204.8% more PassMark for each dollar spent, at 61.7 vs 20.3 PassMark/$ ($449 MSRP vs $1,387 MSRP).
✅Draws 105W instead of 165W, a 60W reduction.

Trade-offs

❌Lower PassMark (27,712 vs 28,088).

Quick Answers

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

It depends on what you want from the system. For gaming, Ryzen 7 5800X is ahead with a 11.9% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Core i9-9940X pulls ahead with 1.4% better PassMark. Ryzen 7 5800X also has the bigger cache pool with 66.2% larger total L3 cache (32 MB vs 19 MB).

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

For streaming, content creation, and heavier multitasking, Core i9-9940X is the stronger fit. You are getting 1.4% better PassMark, backed by 14 cores and 28 threads.

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

Ryzen 7 5800X is the better buy right now. Ryzen 7 5800X comes in $938 cheaper on MSRP at $449 MSRP versus $1,387 MSRP, and it still gives you a 11.9% average FPS lead across 50 shared CPU game tests in our data. The compromise is that Core i9-9940X is still stronger for heavier multi-core work with 1.4% better PassMark. It is also 204.8% better value on MSRP (61.7 vs 20.3 PassMark/$), 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 5800X makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2020 vs 2018) and 66.2% larger total L3 cache (32 MB vs 19 MB). That makes it the safer long-term bet.

Core i9-9940X vs Ryzen 7 5800X 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 5800X

The Ryzen 7 5800X is manufactured by AMD. It was released in 5 November 2020 (5 years ago). It is based on the Vermeer (Zen 3) (2020−2022) architecture. It features 8 cores and 16 threads. Base frequency is 3.8 GHz, with boost up to 4.7 GHz. L3 cache: 32 MB. L2 cache: 512K (per core). Built on 7 nm, 12 nm process technology. Socket: AM4. Thermal design power (TDP): 105 Watt. Memory support: DDR4. Passmark benchmark score: 27,712 points. Launch price was $449.

⚡

Processing Power

The Core i9-9940X packs 14 cores / 28 threads, while the Ryzen 7 5800X 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 4.7 GHz on the Ryzen 7 5800X — a 4.3% clock advantage for the Ryzen 7 5800X (base: 3.3 GHz vs 3.8 GHz). The Core i9-9940X uses the Skylake (server) (2017−2018) architecture (14 nm), while the Ryzen 7 5800X uses Vermeer (Zen 3) (2020−2022) (7 nm, 12 nm). In PassMark, the Core i9-9940X scores 28,088 against the Ryzen 7 5800X's 27,712 — a 1.3% lead for the Core i9-9940X. L3 cache: 19.25 MB (total) on the Core i9-9940X vs 32 MB on the Ryzen 7 5800X.

Feature	Core i9-9940X	Ryzen 7 5800X
Cores / Threads	14 / 28+75%	8 / 16
Boost Clock	4.5 GHz	4.7 GHz+4%
Base Clock	3.3 GHz	3.8 GHz+15%
L3 Cache	19.25 MB (total)	32 MB+66%
L2 Cache	1 MB (per core)	512K (per core)+51100%
Process	14 nm	7 nm, 12 nm-50%
Architecture	Skylake (server) (2017−2018)	Vermeer (Zen 3) (2020−2022)
PassMark	28,088+1%	27,712

🧠

Memory & Platform

The Core i9-9940X uses the LGA2066 socket (PCIe 3.0), while the Ryzen 7 5800X 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 5800X — the Ryzen 7 5800X 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 5800X). PCIe lanes: 44 (Core i9-9940X) vs 24 (Ryzen 7 5800X) — the Core i9-9940X offers 20 more lanes for additional GPUs or NVMe drives.

Feature	Core i9-9940X	Ryzen 7 5800X
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

Both processors feature an unlocked multiplier for overclocking. Only the Core i9-9940X supports AVX-512 instructions — important for machine learning and scientific applications. Virtualization support: VT-x, VT-d (Core i9-9940X) vs AMD-V (Ryzen 7 5800X). Primary use case: Core i9-9940X targets Workstation, Ryzen 7 5800X targets Desktop.

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

💰

Value Analysis

At launch, the Core i9-9940X was priced at $1387, while the Ryzen 7 5800X came in at $449. On launch pricing ($1387 vs $449), Ryzen 7 5800X was $938 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core i9-9940X delivers 20.3 pts/$ vs 61.7 pts/$ for the Ryzen 7 5800X — making the Ryzen 7 5800X the 101.2% better value option.

Feature	Core i9-9940X	Ryzen 7 5800X
MSRP	$1387	$449-68%
Performance per Dollar	20.3	61.7+204%
Release Date	2018	2020

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