Ryzen 7 7745HX vs Ryzen 9 3900X

CPU

GPU

Ryzen 7 7745HX

8 Cores16 Thrd55 WWMax: 5.1 GHz2023

Ryzen family

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Ryzen 9 3900X

12 Cores24 Thrd105 WWMax: 4.6 GHz2019

Ryzen family

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Ryzen 7 7745HX vs Ryzen 9 3900X Performance Spectrum

Ryzen 7 7745HX

8 / 16

32,515

0.0%

Ryzen Threadripper PRO 5955WX

Ryzen 9 9950X

Ryzen Threadripper PRO 7965WX

Ryzen Threadripper PRO 7975WX

Ryzen 9 3900X

12 / 24

32,517

0.0%

Ryzen Threadripper PRO 5955WX

Ryzen 9 9950X

Ryzen Threadripper PRO 7965WX

Ryzen Threadripper PRO 7975WX

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 7 7745HX vs Ryzen 9 3900X 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 7 7745HX vs Ryzen 9 3900X: Pros, Cons & Final Verdict

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

Ryzen 7 7745HX

2023

Why buy it

✅+16.7% higher Geekbench multi-core.
✅Draws 55W instead of 105W, a 50W reduction.
✅Newer platform on FL1 with DDR5 support instead of AM4 and DDR4.
✅16.7% more PCIe lanes (28 vs 24) for storage and expansion-heavy builds.
✅Integrated graphics onboard with Radeon 610M, while Ryzen 9 3900X needs a discrete GPU.

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen 9 3900X across 50 shared CPU benchmark tests.
❌Smaller total L3 cache (32 MB vs 64 MB).

Ryzen 9 3900X

2019

Why buy it

✅Better for gaming: +6.5% higher average FPS across 50 shared CPU benchmark tests.
✅+100% larger total L3 cache (64 MB vs 32 MB).

Trade-offs

❌Lower Geekbench multi-core (12,000 vs 14,000).
❌Launch MSRP is still $499 MSRP, while Ryzen 7 7745HX mostly shows up through inconsistent older-market listings.
❌90.9% higher power demand at 105W vs 55W.
❌Older platform position on AM4 with DDR4, while Ryzen 7 7745HX moves to FL1 and DDR5.
❌No integrated graphics, while Ryzen 7 7745HX can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Ryzen 7 7745HX better than Ryzen 9 3900X?

It depends on what you want from the system. For gaming, Ryzen 9 3900X is ahead with a 6.5% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Ryzen 7 7745HX pulls ahead with 16.7% better Geekbench multi-core. Ryzen 9 3900X also has the bigger cache pool with 100% larger total L3 cache (64 MB vs 32 MB).

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

For streaming, content creation, and heavier multitasking, Ryzen 7 7745HX is the stronger fit. You are getting 16.7% better Geekbench multi-core, backed by 8 cores and 16 threads.

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

Ryzen 7 7745HX is still the faster CPU overall, but Ryzen 9 3900X is easier to justify if budget matters more than peak performance. Ryzen 7 7745HX comes in at an unclear MSRP at unclear MSRP versus $499 MSRP, and it still gives you 16.7% better Geekbench multi-core. The compromise is that Ryzen 9 3900X is still the better pure gaming CPU with a 6.5% average FPS lead across 50 shared CPU game tests in our data. Ryzen 9 3900X is also 100.0% better value on MSRP (65.2 vs 0.0 PassMark/$), which is why it can still make sense for tighter-budget builds on paper.

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

Ryzen 7 7745HX makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2023 vs 2019), a healthier platform with FL1 and DDR5 instead of AM4, and more multi-core headroom with 8 cores / 16 threads instead of 12/24. That gives you a healthier platform runway for motherboard, RAM, and later CPU upgrades.

Ryzen 7 7745HX vs Ryzen 9 3900X Technical Specifications

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

Ryzen 7 7745HX

The Ryzen 7 7745HX is manufactured by AMD. It was released in 4 January 2023 (2 years ago). It is based on the Dragon Range (Zen 4) (2023) architecture. It features 8 cores and 16 threads. Base frequency is 3.6 GHz, with boost up to 5.1 GHz. L3 cache: 32 MB (total). L2 cache: 1 MB (per core). Built on CCD = 5 nm, I/O = 6 nm process technology. Socket: FL1. Thermal design power (TDP): 55 Watt. Memory support: DDR5. Passmark benchmark score: 32,515 points. Launch price was $499.

Ryzen 9 3900X

The Ryzen 9 3900X is manufactured by AMD. It was released in 7 July 2019 (6 years ago). It is based on the Matisse (Zen 2) (2019−2020) architecture. It features 12 cores and 24 threads. Base frequency is 3.8 GHz, with boost up to 4.6 GHz. L3 cache: 64 MB. L2 cache: 512K (per core). Built on 7 nm, 12 nm process technology. Socket: AM4. Thermal design power (TDP): 125 Watt. Memory support: DDR4 Dual-channel. Passmark benchmark score: 32,517 points. Launch price was $499.

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Processing Power

The Ryzen 7 7745HX packs 8 cores / 16 threads, while the Ryzen 9 3900X offers 12 cores / 24 threads — the Ryzen 9 3900X has 4 more cores. Boost clocks reach 5.1 GHz on the Ryzen 7 7745HX versus 4.6 GHz on the Ryzen 9 3900X — a 10.3% clock advantage for the Ryzen 7 7745HX (base: 3.6 GHz vs 3.8 GHz). The Ryzen 7 7745HX uses the Dragon Range (Zen 4) (2023) architecture (CCD = 5 nm, I/O = 6 nm), while the Ryzen 9 3900X uses Matisse (Zen 2) (2019−2020) (7 nm, 12 nm). In PassMark, the Ryzen 7 7745HX scores 32,515 against the Ryzen 9 3900X's 32,517 — a 0% lead for the Ryzen 9 3900X. Geekbench 6 single-core — the metric most relevant to gaming — records 2,623 vs 1,300, a 67.4% lead for the Ryzen 7 7745HX that directly translates to higher frame rates. Multi-core Geekbench: 14,000 vs 12,000 (15.4% advantage for the Ryzen 7 7745HX). L3 cache: 32 MB (total) on the Ryzen 7 7745HX vs 64 MB on the Ryzen 9 3900X.

Feature	Ryzen 7 7745HX	Ryzen 9 3900X
Cores / Threads	8 / 16	12 / 24+50%
Boost Clock	5.1 GHz+11%	4.6 GHz
Base Clock	3.6 GHz	3.8 GHz+6%
L3 Cache	32 MB (total)	64 MB+100%
L2 Cache	1 MB (per core)	512K (per core)+51100%
Process	CCD = 5 nm, I/O = 6 nm-29%	7 nm, 12 nm
Architecture	Dragon Range (Zen 4) (2023)	Matisse (Zen 2) (2019−2020)
PassMark	32,515	32,517
Cinebench R23 Multi	18,606	—
Geekbench 6 Single	2,623+102%	1,300
Geekbench 6 Multi	14,000+17%	12,000

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Memory & Platform

The Ryzen 7 7745HX uses the FL1 socket (PCIe 4.0), while the Ryzen 9 3900X uses AM4 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR5-5200 on the Ryzen 7 7745HX versus DDR4-3200 on the Ryzen 9 3900X — the Ryzen 7 7745HX supports 62.5% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Ryzen 9 3900X supports up to 128 GB of RAM compared to 64 GB — 100% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 28 (Ryzen 7 7745HX) vs 24 (Ryzen 9 3900X) — the Ryzen 7 7745HX offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: FL1 (Ryzen 7 7745HX) and X570,B550 (Ryzen 9 3900X).

Feature	Ryzen 7 7745HX	Ryzen 9 3900X
Socket	FL1	AM4
PCIe Generation	PCIe 4.0	PCIe 4.0
Max RAM Speed	DDR5-5200+63%	DDR4-3200
Max RAM Capacity	64 GB	128 GB+100%
RAM Channels	2	2
ECC Support	Yes	Yes
PCIe Lanes	28+17%	24

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Advanced Features

Both processors feature an unlocked multiplier for overclocking. Only the Ryzen 7 7745HX supports AVX-512 instructions — important for machine learning and scientific applications. Both support AMD-V virtualization. The Ryzen 7 7745HX includes integrated graphics (Radeon 610M), while the Ryzen 9 3900X requires a dedicated GPU. Primary use case: Ryzen 7 7745HX targets Performance Gaming Laptop, Ryzen 9 3900X targets Workstation. Direct competitor: Ryzen 7 7745HX rivals Core i7-13700HX.