Ryzen 5 8645HS vs Ryzen 9 5900HX

CPU

GPU

Ryzen 5 8645HS

6 Cores12 Thrd45 WWMax: 5 GHz2023

Ryzen family

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Ryzen 9 5900HX

8 Cores16 Thrd45 WWMax: 4.6 GHz2021

Ryzen family

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Ryzen 5 8645HS vs Ryzen 9 5900HX Performance Spectrum

Ryzen 5 8645HS

6 / 12

22,257

+0.3%

Ryzen Threadripper PRO 3955WX

Ryzen 9 9900X3D

Ryzen Threadripper PRO 5975WX

Ryzen Threadripper 9960X

Ryzen 9 5900HX

8 / 16

22,198

0.0%

Ryzen Threadripper PRO 3955WX

Ryzen 9 9900X3D

Ryzen Threadripper PRO 5975WX

Ryzen Threadripper 9960X

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.

Ryzen 5 8645HS vs Ryzen 9 5900HX 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.

Ryzen 5 8645HS vs Ryzen 9 5900HX: Pros, Cons & Final Verdict

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

Ryzen 5 8645HS

2023

Why buy it

✅Newer platform on FP8 with DDR5 support instead of FP6 and DDR4.
✅25% more PCIe lanes (20 vs 16) for storage and expansion-heavy builds.

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen 9 5900HX across 50 shared CPU benchmark tests.
❌Lower Cinebench R23 multi-core (13,316 vs 13,955).
❌No boxed cooler included, unlike Ryzen 9 5900HX.

Ryzen 9 5900HX

2021

Why buy it

✅Better for gaming: +4.8% higher average FPS across 50 shared CPU benchmark tests.
✅Includes a boxed cooler (Laptop Integrated), unlike Ryzen 5 8645HS.

Trade-offs

❌Launch MSRP is still $266 MSRP, while Ryzen 5 8645HS mostly shows up through inconsistent older-market listings.
❌Older platform position on FP6 with DDR4, while Ryzen 5 8645HS moves to FP8 and DDR5.

Quick Answers

So, is Ryzen 9 5900HX better than Ryzen 5 8645HS?

Yes. Ryzen 9 5900HX is the better all-around CPU here. It gives you a 4.8% average FPS lead across 50 shared CPU game tests in our data and 4.8% better Cinebench R23 multi-core, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Ryzen 9 5900HX is the better pick. According to our tests, it delivers 4.8% 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 5900HX is the stronger fit. You are getting 4.8% better Cinebench R23 multi-core, backed by 8 cores and 16 threads.

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

Ryzen 9 5900HX is the better buy right now. Ryzen 9 5900HX comes in at an unclear MSRP at $266 MSRP versus unclear MSRP, and it still gives you a 4.8% average FPS lead across 50 shared CPU game tests in our data. It is also 100.0% better value on MSRP (83.5 vs 0.0 PassMark/$), 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 5 8645HS makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2023 vs 2021) and a healthier platform with FP8 and DDR5 instead of FP6. That gives you a healthier platform runway for motherboard, RAM, and later CPU upgrades.

Ryzen 5 8645HS vs Ryzen 9 5900HX Technical Specifications

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

Ryzen 5 8645HS

The Ryzen 5 8645HS is manufactured by AMD. It was released in 6 December 2023 (1 year ago). It is based on the Hawk Point-HS (Zen 4) (2023−2024) architecture. It features 6 cores and 12 threads. Base frequency is 4.3 GHz, with boost up to 5 GHz. L3 cache: 16 MB (total). L2 cache: 1 MB (per core). Built on 4 nm process technology. Socket: FP8. Thermal design power (TDP): 45 Watt. Memory support: DDR5. Passmark benchmark score: 22,257 points. Launch price was $299.

Ryzen 9 5900HX

The Ryzen 9 5900HX is manufactured by AMD. It was released in 12 January 2021 (4 years ago). It is based on the Cezanne-H (Zen 3) (2021) architecture. It features 8 cores and 16 threads. Base frequency is 3.3 GHz, with boost up to 4.6 GHz. L3 cache: 16 MB (total). L2 cache: 512K (per core). Built on 7 nm process technology. Socket: FP6. Thermal design power (TDP): 45 Watt. Memory support: DDR4. Passmark benchmark score: 22,198 points. Launch price was $299.

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Processing Power

The Ryzen 5 8645HS packs 6 cores / 12 threads, while the Ryzen 9 5900HX offers 8 cores / 16 threads — the Ryzen 9 5900HX has 2 more cores. Boost clocks reach 5 GHz on the Ryzen 5 8645HS versus 4.6 GHz on the Ryzen 9 5900HX — a 8.3% clock advantage for the Ryzen 5 8645HS (base: 4.3 GHz vs 3.3 GHz). The Ryzen 5 8645HS uses the Hawk Point-HS (Zen 4) (2023−2024) architecture (4 nm), while the Ryzen 9 5900HX uses Cezanne-H (Zen 3) (2021) (7 nm). In PassMark, the Ryzen 5 8645HS scores 22,257 against the Ryzen 9 5900HX's 22,198 — a 0.3% lead for the Ryzen 5 8645HS. Cinebench R23 multi-core: 13,316 vs 13,955 (4.7% advantage for the Ryzen 9 5900HX). Geekbench 6 single-core — the metric most relevant to gaming — records 2,574 vs 1,845, a 33% lead for the Ryzen 5 8645HS that directly translates to higher frame rates. Multi-core Geekbench: 10,675 vs 7,587 (33.8% advantage for the Ryzen 5 8645HS). Both processors carry 16 MB (total) of L3 cache.

Feature	Ryzen 5 8645HS	Ryzen 9 5900HX
Cores / Threads	6 / 12	8 / 16+33%
Boost Clock	5 GHz+9%	4.6 GHz
Base Clock	4.3 GHz+30%	3.3 GHz
L3 Cache	16 MB (total)	16 MB (total)
L2 Cache	1 MB (per core)	512K (per core)+51100%
Process	4 nm-43%	7 nm
Architecture	Hawk Point-HS (Zen 4) (2023−2024)	Cezanne-H (Zen 3) (2021)
PassMark	22,257	22,198
Cinebench R23 Multi	13,316	13,955+5%
Geekbench 6 Single	2,574+40%	1,845
Geekbench 6 Multi	10,675+41%	7,587

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Memory & Platform

The Ryzen 5 8645HS uses the FP8 socket (PCIe 4.0), while the Ryzen 9 5900HX uses FP6 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches LPDDR5x-7500 on the Ryzen 5 8645HS versus DDR4-3200, LPDDR4-4266 on the Ryzen 9 5900HX — the Ryzen 5 8645HS supports 134.4% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Ryzen 5 8645HS supports up to 256 GB of RAM compared to 64 GB — 300% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 20 (Ryzen 5 8645HS) vs 16 (Ryzen 9 5900HX) — the Ryzen 5 8645HS offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: SoC (Ryzen 5 8645HS) and FP6 (Ryzen 9 5900HX).

Feature	Ryzen 5 8645HS	Ryzen 9 5900HX
Socket	FP8	FP6
PCIe Generation	PCIe 4.0	PCIe 4.0
Max RAM Speed	LPDDR5x-7500+134%	DDR4-3200, LPDDR4-4266
Max RAM Capacity	256 GB+300%	64 GB
RAM Channels	2	2
ECC Support	Yes	No
PCIe Lanes	20+25%	16

🔧

Advanced Features

Only the Ryzen 9 5900HX has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Only the Ryzen 5 8645HS supports AVX-512 instructions — important for machine learning and scientific applications. Virtualization support: AMD-V (SVM) (Ryzen 5 8645HS) vs AMD-V (Ryzen 9 5900HX). Both include integrated graphics — Radeon 760M (Ryzen 5 8645HS) and Radeon RX Vega 8 (Ryzen 9 5900HX) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Ryzen 5 8645HS targets Gaming, Ryzen 9 5900HX targets Gaming Laptop / Mobile Workstation. Direct competitor: Ryzen 5 8645HS rivals Core i5-13500H; Ryzen 9 5900HX rivals Core i9-11980HK.

Feature	Ryzen 5 8645HS	Ryzen 9 5900HX
Integrated GPU	Yes	Yes
IGPU Model	Radeon 760M	Radeon RX Vega 8
Unlocked	No	Yes
AVX-512	Yes	No
Virtualization	AMD-V (SVM)	AMD-V
Target Use	Gaming	Gaming Laptop / Mobile Workstation