Core i9-9900KS vs Ryzen 9 5900X

Core i9-9900KS vs Ryzen 9 5900X Performance Spectrum

Core i9-9900KS

8 / 16

19,397

0.0%

38,955

+100.8%

Ryzen Threadripper 9960X

Ryzen Threadripper PRO 9975WX

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 i9-9900KS vs Ryzen 9 5900X 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 i9-9900KS vs Ryzen 9 5900X: Pros, Cons & Final Verdict

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

Core i9-9900KS

2019

Why buy it

✅Costs $36 less on MSRP ($513 MSRP vs $549 MSRP).

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen 9 5900X across 50 shared CPU benchmark tests.
❌Lower PassMark (19,397 vs 38,955).
❌Smaller total L3 cache (16 MB vs 64 MB).
❌Lower PassMark per dollar, at 37.8 vs 71.0 PassMark/$ ($513 MSRP vs $549 MSRP).
❌21% higher power demand at 127W vs 105W.

Ryzen 9 5900X

2020

Why buy it

✅Better for gaming: +20.6% higher average FPS across 50 shared CPU benchmark tests.
✅+300% larger total L3 cache (64 MB vs 16 MB).
✅Delivers 87.7% more PassMark for each dollar spent, at 71.0 vs 37.8 PassMark/$ ($549 MSRP vs $513 MSRP).
✅Draws 105W instead of 127W, a 22W reduction.
✅100+% more PCIe lanes (24 vs 0) for storage and expansion-heavy builds.

Trade-offs

❌
7% HIGHER MSRP
$549 MSRPvs$513 MSRP

Quick Answers

So, is Ryzen 9 5900X better than Core i9-9900KS?

Yes. Ryzen 9 5900X is the better all-around CPU here. It gives you a 20.6% average FPS lead across 50 shared CPU game tests in our data, 100.8% 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 9 5900X is the better pick. According to our tests, it delivers 20.6% more average FPS across 50 shared CPU game tests.

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

For streaming, content creation, and heavier multitasking, Ryzen 9 5900X is the stronger fit. You are getting 100.8% better PassMark, backed by 12 cores and 24 threads. It also has the larger cache pool with 300% larger total L3 cache (64 MB vs 16 MB).

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

Ryzen 9 5900X is the better buy right now. Ryzen 9 5900X comes in 7.0% more expensive on MSRP at $549 MSRP versus $513 MSRP, and it still gives you a 20.6% average FPS lead across 50 shared CPU game tests in our data. It is also 87.7% better value on MSRP (71.0 vs 37.8 PassMark/$), 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 9 5900X makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2020 vs 2019), 300% larger total L3 cache (64 MB vs 16 MB), and more multi-core headroom with 12 cores / 24 threads instead of 8/16. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Core i9-9900KS vs Ryzen 9 5900X Technical Specifications

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

Core i9-9900KS

The Core i9-9900KS is manufactured by Intel. It was released in 28 October 2019 (6 years ago). It is based on the Coffee Lake-R (2018−2019) architecture. It features 8 cores and 16 threads. Base frequency is 4 GHz, with boost up to 5 GHz. L3 cache: 16 MB (total). L2 cache: 256 kB (per core). Built on 14 nm process technology. Socket: LGA1151. Thermal design power (TDP): 127 Watt. Memory support: DDR4. Passmark benchmark score: 19,397 points. Launch price was $513.

Ryzen 9 5900X

The Ryzen 9 5900X is manufactured by AMD. It was released in 5 November 2020 (5 years ago). It is based on the Vermeer (Zen3) (2020−2022) architecture. It features 12 cores and 24 threads. Base frequency is 3.7 GHz, with boost up to 4.8 GHz. L3 cache: 64 MB. L2 cache: 512K (per core). Built on 7 nm, 12 nm process technology. Socket: AM4. Thermal design power (TDP): 105 Watt. Memory support: DDR4-3200. Passmark benchmark score: 38,955 points. Launch price was $549.

⚡

Processing Power

The Core i9-9900KS packs 8 cores / 16 threads, while the Ryzen 9 5900X offers 12 cores / 24 threads — the Ryzen 9 5900X has 4 more cores. Boost clocks reach 5 GHz on the Core i9-9900KS versus 4.8 GHz on the Ryzen 9 5900X — a 4.1% clock advantage for the Core i9-9900KS (base: 4 GHz vs 3.7 GHz). The Core i9-9900KS uses the Coffee Lake-R (2018−2019) architecture (14 nm), while the Ryzen 9 5900X uses Vermeer (Zen3) (2020−2022) (7 nm, 12 nm). In PassMark, the Core i9-9900KS scores 19,397 against the Ryzen 9 5900X's 38,955 — a 67% lead for the Ryzen 9 5900X. L3 cache: 16 MB (total) on the Core i9-9900KS vs 64 MB on the Ryzen 9 5900X.

Feature	Core i9-9900KS	Ryzen 9 5900X
Cores / Threads	8 / 16	12 / 24+50%
Boost Clock	5 GHz+4%	4.8 GHz
Base Clock	4 GHz+8%	3.7 GHz
L3 Cache	16 MB (total)	64 MB+300%
L2 Cache	256 kB (per core)	512K (per core)+100%
Process	14 nm	7 nm, 12 nm-50%
Architecture	Coffee Lake-R (2018−2019)	Vermeer (Zen3) (2020−2022)
PassMark	19,397	38,955+101%
Cinebench R23 Multi	—	21,000
Geekbench 6 Single	—	2,174
Geekbench 6 Multi	—	11,888

🧠

Memory & Platform

The Core i9-9900KS uses the LGA1151 socket (PCIe 4.0), while the Ryzen 9 5900X uses AM4 (PCIe 4.0) — making them incompatible on the same motherboard.

Feature	Core i9-9900KS	Ryzen 9 5900X
Socket	LGA1151	AM4
PCIe Generation	PCIe 4.0	PCIe 4.0
Max RAM Speed	—	DDR4-3200
Max RAM Capacity	—	128 GB
RAM Channels	—	2
ECC Support	—	Yes
PCIe Lanes	—	24

🔧

Advanced Features

Virtualization: not specified (Core i9-9900KS) / AMD-V (Ryzen 9 5900X). Primary use case: Ryzen 9 5900X targets Workstation. Direct competitor: Ryzen 9 5900X rivals Core i9-12900K.

Feature	Core i9-9900KS	Ryzen 9 5900X
Integrated GPU	—	No
Unlocked	—	Yes
AVX-512	—	No
Virtualization	—	AMD-V
Target Use	—	Workstation

💰

Value Analysis

At launch, the Core i9-9900KS was priced at $513, while the Ryzen 9 5900X came in at $549. On launch pricing ($513 vs $549), Core i9-9900KS was $36 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core i9-9900KS delivers 37.8 pts/$ vs 71.0 pts/$ for the Ryzen 9 5900X — making the Ryzen 9 5900X the 60.9% better value option.

Feature	Core i9-9900KS	Ryzen 9 5900X
MSRP	$513-7%	$549
Performance per Dollar	37.8	71.0+88%
Release Date	2019	2020

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