Ryzen 7 8745HX vs Ryzen 9 3900XT

CPU

GPU

Ryzen 7 8745HX

8 Cores16 Thrd55 WWMax: 5.1 GHz2025

Ryzen family

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Ryzen 9 3900XT

12 Cores24 Thrd105 WWMax: 4.7 GHz2020

Ryzen family

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Ryzen 7 8745HX vs Ryzen 9 3900XT Performance Spectrum

Ryzen 7 8745HX

8 / 16

32,620

+0.3%

Ryzen Threadripper PRO 5955WX

Ryzen 9 9950X

Ryzen Threadripper PRO 7965WX

Ryzen Threadripper PRO 7975WX

Ryzen 9 3900XT

12 / 24

32,512

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 8745HX vs Ryzen 9 3900XT 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 8745HX vs Ryzen 9 3900XT: 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 8745HX

2025

Why buy it

✅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 3900XT needs a discrete GPU.
✅Includes a boxed cooler (Laptop Integrated), unlike Ryzen 9 3900XT.

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen 9 3900XT across 50 shared CPU benchmark tests.
❌Lower Cinebench R23 multi-core (18,000 vs 18,400).
❌Smaller total L3 cache (32 MB vs 64 MB).

Ryzen 9 3900XT

2020

Why buy it

✅Better for gaming: +8.1% higher average FPS across 50 shared CPU benchmark tests.
✅+100% larger total L3 cache (64 MB vs 32 MB).

Trade-offs

❌Launch MSRP is still $499 MSRP, while Ryzen 7 8745HX 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 8745HX moves to FL1 and DDR5.
❌No integrated graphics, while Ryzen 7 8745HX can still boot and troubleshoot without a discrete GPU.
❌No boxed cooler included, unlike Ryzen 7 8745HX.

Quick Answers

So, is Ryzen 9 3900XT better than Ryzen 7 8745HX?

Yes. Ryzen 9 3900XT is the better all-around CPU here. It gives you a 8.1% average FPS lead across 50 shared CPU game tests in our data and 2.2% 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 3900XT is the better pick. According to our tests, it delivers 8.1% 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 3900XT is the stronger fit. You are getting 2.2% better Cinebench R23 multi-core, backed by 12 cores and 24 threads. It also has the larger cache pool with 100% larger total L3 cache (64 MB vs 32 MB).

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

Ryzen 9 3900XT is the better buy right now. Ryzen 9 3900XT comes in at an unclear MSRP at $499 MSRP versus unclear MSRP, and it still gives you a 8.1% average FPS lead across 50 shared CPU game tests in our data. It is also 100.0% better value on MSRP (65.2 vs 0.0 PassMark/$), 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 7 8745HX makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2025 vs 2020) and a healthier platform with FL1 and DDR5 instead of AM4. That gives you a healthier platform runway for motherboard, RAM, and later CPU upgrades.

Ryzen 7 8745HX vs Ryzen 9 3900XT Technical Specifications

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

Ryzen 7 8745HX

The Ryzen 7 8745HX is manufactured by AMD. It was released in 23 April 2025 (less than a year ago). It is based on the Dragon Range (2025) 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 5 nm process technology. Socket: FL1. Thermal design power (TDP): 55 Watt. Memory support: DDR5. Passmark benchmark score: 32,620 points. Launch price was $499.

Ryzen 9 3900XT

The Ryzen 9 3900XT is manufactured by AMD. It was released in 7 July 2020 (5 years ago). It is based on the Matisse 2 (2020) architecture. It features 12 cores and 24 threads. Base frequency is 3.8 GHz, with boost up to 4.7 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: 32,512 points. Launch price was $499.

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Processing Power

The Ryzen 7 8745HX packs 8 cores / 16 threads, while the Ryzen 9 3900XT offers 12 cores / 24 threads — the Ryzen 9 3900XT has 4 more cores. Boost clocks reach 5.1 GHz on the Ryzen 7 8745HX versus 4.7 GHz on the Ryzen 9 3900XT — a 8.2% clock advantage for the Ryzen 7 8745HX (base: 3.6 GHz vs 3.8 GHz). The Ryzen 7 8745HX uses the Dragon Range (2025) architecture (5 nm), while the Ryzen 9 3900XT uses Matisse 2 (2020) (7 nm, 12 nm). In PassMark, the Ryzen 7 8745HX scores 32,620 against the Ryzen 9 3900XT's 32,512 — a 0.3% lead for the Ryzen 7 8745HX. Cinebench R23 multi-core: 18,000 vs 18,400 (2.2% advantage for the Ryzen 9 3900XT). Geekbench 6 single-core — the metric most relevant to gaming — records 2,700 vs 1,750, a 42.7% lead for the Ryzen 7 8745HX that directly translates to higher frame rates. Multi-core Geekbench: 13,500 vs 10,500 (25% advantage for the Ryzen 7 8745HX). L3 cache: 32 MB (total) on the Ryzen 7 8745HX vs 64 MB on the Ryzen 9 3900XT.

Feature	Ryzen 7 8745HX	Ryzen 9 3900XT
Cores / Threads	8 / 16	12 / 24+50%
Boost Clock	5.1 GHz+9%	4.7 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	5 nm-29%	7 nm, 12 nm
Architecture	Dragon Range (2025)	Matisse 2 (2020)
PassMark	32,620	32,512
Cinebench R23 Multi	18,000	18,400+2%
Geekbench 6 Single	2,700+54%	1,750
Geekbench 6 Multi	13,500+29%	10,500

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Memory & Platform

The Ryzen 7 8745HX uses the FL1 socket (PCIe 4.0), while the Ryzen 9 3900XT uses AM4 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR5-5200 on the Ryzen 7 8745HX versus DDR4-3200 on the Ryzen 9 3900XT — the Ryzen 7 8745HX supports 62.5% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Ryzen 9 3900XT 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 8745HX) vs 24 (Ryzen 9 3900XT) — the Ryzen 7 8745HX offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: FL1 (Ryzen 7 8745HX) and X570,B550,X470,B450 (Ryzen 9 3900XT).

Feature	Ryzen 7 8745HX	Ryzen 9 3900XT
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	No	No
PCIe Lanes	28+17%	24

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Advanced Features

Both processors feature an unlocked multiplier for overclocking. Only the Ryzen 7 8745HX supports AVX-512 instructions — important for machine learning and scientific applications. Both support AMD-V virtualization. The Ryzen 7 8745HX includes integrated graphics (Radeon 610M), while the Ryzen 9 3900XT requires a dedicated GPU. Primary use case: Ryzen 7 8745HX targets High-end Gaming Laptop, Ryzen 9 3900XT targets Workstation / Enthusiast Gaming. Direct competitor: Ryzen 7 8745HX rivals Core i7-14700HX; Ryzen 9 3900XT rivals Core i9-10900K.

Feature	Ryzen 7 8745HX	Ryzen 9 3900XT
Integrated GPU	Yes	No
IGPU Model	Radeon 610M	—
Unlocked	Yes	Yes
AVX-512	Yes	No
Virtualization	AMD-V	AMD-V
Target Use	High-end Gaming Laptop	Workstation / Enthusiast Gaming