Pentium Gold 6405U vs Ryzen 9 5900X

Pentium Gold 6405U vs Ryzen 9 5900X Performance Spectrum

Pentium Gold 6405U

2 / 4

1,320

0.0%

Celeron N3010

Pentium D 940

Core 2 Duo E6750

Celeron Dual-Core T3100

38,955

+2851.1%

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.

Pentium Gold 6405U 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.

Pentium Gold 6405U 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.

Pentium Gold 6405U

2019

Why buy it

✅Draws 1W instead of 105W, a 104W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen 9 5900X across 46 shared CPU benchmark tests.
❌Lower PassMark (1,320 vs 38,955).
❌Smaller total L3 cache (2 MB vs 64 MB).

Ryzen 9 5900X

2020

Why buy it

✅Better for gaming: +792.1% higher average FPS across 46 shared CPU benchmark tests.
✅+3100% larger total L3 cache (64 MB vs 2 MB).
✅100+% more PCIe lanes (24 vs 0) for storage and expansion-heavy builds.

Trade-offs

❌Launch MSRP is still $549 MSRP, while Pentium Gold 6405U mostly shows up through inconsistent older-market listings.
❌10400% higher power demand at 105W vs 1W.

Quick Answers

So, is Ryzen 9 5900X better than Pentium Gold 6405U?

Yes. Ryzen 9 5900X is the better all-around CPU here. It gives you a 792.1% average FPS lead across 46 shared CPU game tests in our data, 2851.1% 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 792.1% more average FPS across 46 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 2851.1% better PassMark, backed by 12 cores and 24 threads. It also has the larger cache pool with 3100% larger total L3 cache (64 MB vs 2 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 at an unclear MSRP at $549 MSRP versus unclear MSRP, and it still gives you a 792.1% average FPS lead across 46 shared CPU game tests in our data. It is also 100.0% better value on MSRP (71.0 vs 0.0 PassMark/$), 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), 3100% larger total L3 cache (64 MB vs 2 MB), and more multi-core headroom with 12 cores / 24 threads instead of 2/4. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Pentium Gold 6405U vs Ryzen 9 5900X Technical Specifications

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

Pentium Gold 6405U

The Pentium Gold 6405U is manufactured by Intel. It was released in 31 October 2019 (6 years ago). It is based on the Comet Lake-U (2019−2020) architecture. It features 2 cores and 4 threads. Base frequency is 2.4 GHz, with boost up to 2.4 GHz. L3 cache: 2 MB. L2 cache: 1 MB. Built on 14 nm process technology. Socket: FCBGA1528. Thermal design power (TDP): 15 Watt. Memory support: DDR4. Passmark benchmark score: 1,320 points. Launch price was $161.

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 Pentium Gold 6405U packs 2 cores / 4 threads, while the Ryzen 9 5900X offers 12 cores / 24 threads — the Ryzen 9 5900X has 10 more cores. Boost clocks reach 2.4 GHz on the Pentium Gold 6405U versus 4.8 GHz on the Ryzen 9 5900X — a 66.7% clock advantage for the Ryzen 9 5900X (base: 2.4 GHz vs 3.7 GHz). The Pentium Gold 6405U uses the Comet Lake-U (2019−2020) architecture (14 nm), while the Ryzen 9 5900X uses Vermeer (Zen3) (2020−2022) (7 nm, 12 nm). In PassMark, the Pentium Gold 6405U scores 1,320 against the Ryzen 9 5900X's 38,955 — a 186.9% lead for the Ryzen 9 5900X. L3 cache: 2 MB on the Pentium Gold 6405U vs 64 MB on the Ryzen 9 5900X.

Feature	Pentium Gold 6405U	Ryzen 9 5900X
Cores / Threads	2 / 4	12 / 24+500%
Boost Clock	2.4 GHz	4.8 GHz+100%
Base Clock	2.4 GHz	3.7 GHz+54%
L3 Cache	2 MB	64 MB+3100%
L2 Cache	1 MB	512K (per core)+51100%
Process	14 nm	7 nm, 12 nm-50%
Architecture	Comet Lake-U (2019−2020)	Vermeer (Zen3) (2020−2022)
PassMark	1,320	38,955+2851%
Cinebench R23 Multi	—	21,000
Geekbench 6 Single	—	2,174
Geekbench 6 Multi	—	11,888

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Memory & Platform

The Pentium Gold 6405U uses the FCBGA1528 socket (PCIe 3.0), while the Ryzen 9 5900X uses AM4 (PCIe 4.0) — making them incompatible on the same motherboard.

Feature	Pentium Gold 6405U	Ryzen 9 5900X
Socket	FCBGA1528	AM4
PCIe Generation	PCIe 3.0	PCIe 4.0+33%
Max RAM Speed	—	DDR4-3200
Max RAM Capacity	—	128 GB
RAM Channels	—	2
ECC Support	—	Yes
PCIe Lanes	—	24

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Advanced Features

Virtualization: not specified (Pentium Gold 6405U) / AMD-V (Ryzen 9 5900X). Primary use case: Ryzen 9 5900X targets Workstation. Direct competitor: Ryzen 9 5900X rivals Core i9-12900K.