Core i9-9940X vs Ryzen 7 5800XT

CPU

GPU

Core i9-9940X

14 Cores28 Thrd165 WWMax: 4.5 GHz2018

Similar parts

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Ryzen 7 5800XT

8 Cores16 Thrd105 WWMax: 4.8 GHz2024

Ryzen family

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

Core i9-9940X

14 / 28

28,088

+0.3%

27,992

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 5800XT 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 5800XT: 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

✅+0.3% higher PassMark.
✅120% more PCIe lanes (44 vs 20) for storage and expansion-heavy builds.

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen 7 5800XT across 50 shared CPU benchmark tests.
❌Smaller total L3 cache (19 MB vs 32 MB).
❌Lower PassMark per dollar, at 20.3 vs 112.4 PassMark/$ ($1,387 MSRP vs $249 MSRP).
❌57.1% higher power demand at 165W vs 105W.
❌No boxed cooler included, unlike Ryzen 7 5800XT.

Ryzen 7 5800XT

2024

Why buy it

✅Better for gaming: +5.5% higher average FPS across 50 shared CPU benchmark tests.
✅+66.2% larger total L3 cache (32 MB vs 19 MB).
✅Costs $1,138 less on MSRP ($249 MSRP vs $1,387 MSRP).
✅Delivers 455.1% more PassMark for each dollar spent, at 112.4 vs 20.3 PassMark/$ ($249 MSRP vs $1,387 MSRP).
✅Draws 105W instead of 165W, a 60W reduction.

Trade-offs

❌Lower PassMark (27,992 vs 28,088).

Quick Answers

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

It depends on what you want from the system. For gaming, Ryzen 7 5800XT is ahead with a 5.5% 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 0.3% better PassMark. Ryzen 7 5800XT 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 0.3% better PassMark, backed by 14 cores and 28 threads.

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

Ryzen 7 5800XT is the better buy right now. Ryzen 7 5800XT comes in $1,138 cheaper on MSRP at $249 MSRP versus $1,387 MSRP, and it still gives you a 5.5% average FPS lead across 50 shared CPU game tests in our data. The compromise is that Core i9-9940X is still stronger for heavier multi-core work with 0.3% better PassMark. It is also 455.1% better value on MSRP (112.4 vs 20.3 PassMark/$), 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 5800XT makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2024 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 5800XT 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 5800XT

The Ryzen 7 5800XT is manufactured by AMD. It was released in 31 July 2024 (1 year ago). It is based on the Vermeer (2020−2025) architecture. It features 8 cores and 16 threads. Base frequency is 3.8 GHz, with boost up to 4.8 GHz. L3 cache: 32 MB. L2 cache: 512 kB (per core). Built on 7 nm process technology. Socket: AM4. Thermal design power (TDP): 105 Watt. Memory support: DDR4. Passmark benchmark score: 27,992 points. Launch price was $249.

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Processing Power

The Core i9-9940X packs 14 cores / 28 threads, while the Ryzen 7 5800XT 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 4.8 GHz on the Ryzen 7 5800XT — a 6.5% clock advantage for the Ryzen 7 5800XT (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 5800XT uses Vermeer (2020−2025) (7 nm). In PassMark, the Core i9-9940X scores 28,088 against the Ryzen 7 5800XT's 27,992 — a 0.3% lead for the Core i9-9940X. L3 cache: 19.25 MB (total) on the Core i9-9940X vs 32 MB on the Ryzen 7 5800XT.

Feature	Core i9-9940X	Ryzen 7 5800XT
Cores / Threads	14 / 28+75%	8 / 16
Boost Clock	4.5 GHz	4.8 GHz+7%
Base Clock	3.3 GHz	3.8 GHz+15%
L3 Cache	19.25 MB (total)	32 MB+66%
L2 Cache	1 MB (per core)+100%	512 kB (per core)
Process	14 nm	7 nm-50%
Architecture	Skylake (server) (2017−2018)	Vermeer (2020−2025)
PassMark	28,088	27,992
Cinebench R23 Multi	—	15,036
Geekbench 6 Single	—	2,172
Geekbench 6 Multi	—	10,940

🧠

Memory & Platform

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

Feature	Core i9-9940X	Ryzen 7 5800XT
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+120%	20

🔧

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, SVM (Ryzen 7 5800XT). Primary use case: Core i9-9940X targets Workstation, Ryzen 7 5800XT targets Gaming / Content Creation (AM4 Legacy). Direct competitor: Ryzen 7 5800XT rivals Core i7-12700K.

Feature	Core i9-9940X	Ryzen 7 5800XT
Integrated GPU	No	No
Unlocked	Yes	Yes
AVX-512	Yes	No
Virtualization	VT-x, VT-d	AMD-V, SVM
Target Use	Workstation	Gaming / Content Creation (AM4 Legacy)

💰

Value Analysis

At launch, the Core i9-9940X was priced at $1387, while the Ryzen 7 5800XT came in at $249. On launch pricing ($1387 vs $249), Ryzen 7 5800XT was $1138 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core i9-9940X delivers 20.3 pts/$ vs 112.4 pts/$ for the Ryzen 7 5800XT — making the Ryzen 7 5800XT the 138.9% better value option.

Feature	Core i9-9940X	Ryzen 7 5800XT
MSRP	$1387	$249-82%
Performance per Dollar	20.3	112.4+454%
Release Date	2018	2024

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