Core i9-11900KB vs Ryzen 9 5900X

CPU

GPU

Core i9-11900KB

8 Cores16 Thrd65 WWMax: 4.9 GHz2021

Core family

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Ryzen 9 5900X

12 Cores24 Thrd105 WWMax: 4.8 GHz2020

Ryzen family

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Core i9-11900KB vs Ryzen 9 5900X Performance Spectrum

Core i9-11900KB

8 / 16

22,693

0.0%

38,955

+71.7%

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 i9-11900KB 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 i9-11900KB 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 i9-11900KB

2021

Why buy it

✅Costs $10 less on MSRP ($539 MSRP vs $549 MSRP).
✅Draws 65W instead of 105W, a 40W reduction.
✅Integrated graphics onboard with Intel UHD Graphics, while Ryzen 9 5900X needs a discrete GPU.

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen 9 5900X across 50 shared CPU benchmark tests.
❌Lower Cinebench R23 multi-core (12,264 vs 21,000).
❌Smaller total L3 cache (24 MB vs 64 MB).
❌Lower PassMark per dollar, at 42.1 vs 71.0 PassMark/$ ($539 MSRP vs $549 MSRP).

Ryzen 9 5900X

2020

Why buy it

✅Better for gaming: +28.4% higher average FPS across 50 shared CPU benchmark tests.
✅+166.7% larger total L3 cache (64 MB vs 24 MB).
✅Delivers 68.5% more PassMark for each dollar spent, at 71.0 vs 42.1 PassMark/$ ($549 MSRP vs $539 MSRP).
✅20% more PCIe lanes (24 vs 20) for storage and expansion-heavy builds.

Trade-offs

❌
1.9% HIGHER MSRP
$549 MSRPvs$539 MSRP
❌61.5% higher power demand at 105W vs 65W.
❌No integrated graphics, while Core i9-11900KB can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Ryzen 9 5900X better than Core i9-11900KB?

Yes. Ryzen 9 5900X is the better all-around CPU here. It gives you a 28.4% average FPS lead across 50 shared CPU game tests in our data, 71.2% better Cinebench R23 multi-core, and 71.7% higher PassMark, 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 28.4% 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 71.2% better Cinebench R23 multi-core, backed by 12 cores and 24 threads. It also has the larger cache pool with 166.7% larger total L3 cache (64 MB vs 24 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 1.9% more expensive on MSRP at $549 MSRP versus $539 MSRP, and it still gives you a 28.4% average FPS lead across 50 shared CPU game tests in our data. It is also 68.5% better value on MSRP (71.0 vs 42.1 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Core i9-11900KB makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2021 vs 2020). That makes it the safer long-term bet.

Core i9-11900KB vs Ryzen 9 5900X Technical Specifications

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

Core i9-11900KB

The Core i9-11900KB is manufactured by Intel. It was released in Maio 2021 (4 years ago). It is based on the Tiger Lake-H (2021) architecture. It features 8 cores and 16 threads. Base frequency is 3.3 GHz, with boost up to 4.9 GHz. L3 cache: 24 MB (total). L2 cache: 1.25 MB (per core). Built on 10 nm SuperFin process technology. Socket: FCBGA1787. Thermal design power (TDP): 65 Watt. Memory support: DDR4. Passmark benchmark score: 22,693 points. Launch price was $539.

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.

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Processing Power

The Core i9-11900KB 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 4.9 GHz on the Core i9-11900KB versus 4.8 GHz on the Ryzen 9 5900X — a 2.1% clock advantage for the Core i9-11900KB (base: 3.3 GHz vs 3.7 GHz). The Core i9-11900KB uses the Tiger Lake-H (2021) architecture (10 nm SuperFin), while the Ryzen 9 5900X uses Vermeer (Zen3) (2020−2022) (7 nm, 12 nm). In PassMark, the Core i9-11900KB scores 22,693 against the Ryzen 9 5900X's 38,955 — a 52.8% lead for the Ryzen 9 5900X. Cinebench R23 multi-core: 12,264 vs 21,000 (52.5% advantage for the Ryzen 9 5900X). Multi-core Geekbench: 10,645 vs 11,888 (11% advantage for the Ryzen 9 5900X). L3 cache: 24 MB (total) on the Core i9-11900KB vs 64 MB on the Ryzen 9 5900X.

Feature	Core i9-11900KB	Ryzen 9 5900X
Cores / Threads	8 / 16	12 / 24+50%
Boost Clock	4.9 GHz+2%	4.8 GHz
Base Clock	3.3 GHz	3.7 GHz+12%
L3 Cache	24 MB (total)	64 MB+167%
L2 Cache	1.25 MB (per core)	512K (per core)+40860%
Process	10 nm SuperFin	7 nm, 12 nm-30%
Architecture	Tiger Lake-H (2021)	Vermeer (Zen3) (2020−2022)
PassMark	22,693	38,955+72%
Cinebench R23 Multi	12,264	21,000+71%
Geekbench 6 Single	—	2,174
Geekbench 6 Multi	10,645	11,888+12%

🧠

Memory & Platform

The Core i9-11900KB uses the FCBGA1787 socket (PCIe 3.0), while the Ryzen 9 5900X uses AM4 (PCIe 4.0) — making them incompatible on the same motherboard. Both support up to DDR4-3200 memory speed. Both support up to 128 GB of RAM. Both feature 2-channel memory with ECC support. PCIe lanes: 20 (Core i9-11900KB) vs 24 (Ryzen 9 5900X) — the Ryzen 9 5900X offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Mobile (Core i9-11900KB) and A320,B350,X370,B450,X470,B550,X570 (Ryzen 9 5900X).

Feature	Core i9-11900KB	Ryzen 9 5900X
Socket	FCBGA1787	AM4
PCIe Generation	PCIe 3.0	PCIe 4.0+33%
Max RAM Speed	DDR4-3200	DDR4-3200
Max RAM Capacity	128 GB	128 GB
RAM Channels	2	2
ECC Support	No	Yes
PCIe Lanes	20	24+20%

🔧

Advanced Features

Both processors feature an unlocked multiplier for overclocking. Only the Core i9-11900KB supports AVX-512 instructions — important for machine learning and scientific applications. Virtualization support: VT-x, VT-d (Core i9-11900KB) vs AMD-V (Ryzen 9 5900X). The Core i9-11900KB includes integrated graphics (Intel UHD Graphics), while the Ryzen 9 5900X requires a dedicated GPU. Primary use case: Ryzen 9 5900X targets Workstation. Direct competitor: Ryzen 9 5900X rivals Core i9-12900K.

Feature	Core i9-11900KB	Ryzen 9 5900X
Integrated GPU	Yes	No
IGPU Model	Intel UHD Graphics	—
Unlocked	Yes	Yes
AVX-512	Yes	No
Virtualization	VT-x, VT-d	AMD-V
Target Use	—	Workstation

💰

Value Analysis

At launch, the Core i9-11900KB was priced at $539, while the Ryzen 9 5900X came in at $549. On launch pricing ($539 vs $549), Core i9-11900KB was $10 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core i9-11900KB delivers 42.1 pts/$ vs 71.0 pts/$ for the Ryzen 9 5900X — making the Ryzen 9 5900X the 51% better value option.

Feature	Core i9-11900KB	Ryzen 9 5900X
MSRP	$539-2%	$549
Performance per Dollar	42.1	71.0+69%
Release Date	2021	2020

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