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.

Head-to-Head Verdict, Benchmarks, Value & Long-Term Outlook

This comparison brings together gaming FPS, productivity performance, platform differences, power efficiency, pricing context, and upgrade path so you can see which CPU actually makes more sense.

Ryzen 7 8745HX

2025

Why buy it

✅+12.5% 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: +17.7% 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 13,500).
❌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.

Ryzen 7 8745HX

2025

Ryzen 9 3900X

2019

Why buy it

✅+12.5% 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.

Why buy it

✅Better for gaming: +17.7% higher average FPS across 50 shared CPU benchmark tests.
✅+100% larger total L3 cache (64 MB vs 32 MB).

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).

Trade-offs

❌Lower Geekbench multi-core (12,000 vs 13,500).
❌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.

Quick Answers

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

It depends on what matters more to you. For gaming, Ryzen 9 3900X is ahead with a 17.7% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Ryzen 7 8745HX pulls ahead with 12.5% 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 8745HX is the better fit. You are getting 12.5% 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 8745HX is still the faster CPU overall, but Ryzen 9 3900X makes more sense if price matters more than absolute performance. Ryzen 7 8745HX is at an unclear MSRP at unclear MSRP versus $499 MSRP, and it gives you 12.5% better Geekbench multi-core. The trade-off is that Ryzen 9 3900X is still the better pure gaming CPU with a 17.7% average FPS lead across 50 shared CPU game tests in our data. Ryzen 9 3900X is also 100.0% better value on MSRP (65.2 vs 0.0 PassMark/$), which is why it is easier to justify for price-conscious builds on paper.

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

Ryzen 7 8745HX is the more future-proof choice for 2026 and beyond. You are getting a newer CPU generation (2025 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 should give you a better long-term upgrade path for motherboard, RAM, and future CPU swaps.

Games Benchmarks

Paired with RTX 4090

To accurately isolate CPU performance, all benchmarks below use an NVIDIA RTX 4090 as the reference GPU. This eliminates GPU-side bottlenecks and highlights pure processing throughput differences between the CPUs.

Note: Real-world results may vary based on your actual GPU. CPU performance impact is more visible in processing-intensive titles and high-refresh-rate gaming scenarios.

Ryzen 7 8745HX Benchmark Check

Ryzen 9 3900X Benchmark Check

Path of Exile 2

Preset	Ryzen 7 8745HX	Ryzen 9 3900X
1080p
low	254 FPS	209 FPS
medium	236 FPS	170 FPS
high	204 FPS	140 FPS
ultra	175 FPS	114 FPS
1440p
low	218 FPS	171 FPS
medium	183 FPS	131 FPS
high	152 FPS	104 FPS
ultra	133 FPS	86 FPS
4K
low	152 FPS	92 FPS
medium	127 FPS	77 FPS
high	99 FPS	61 FPS
ultra	86 FPS	49 FPS

Open Ryzen 7 8745HX Open Ryzen 9 3900X

Path of Exile 2

Path of Exile 2

Counter-Strike 2

Preset	Ryzen 7 8745HX	Ryzen 9 3900X
1080p
low	620 FPS	781 FPS
medium	518 FPS	654 FPS
high	428 FPS	510 FPS
ultra	387 FPS	447 FPS
1440p
low	529 FPS	648 FPS
medium	463 FPS	552 FPS
high	388 FPS	452 FPS
ultra	332 FPS	369 FPS
4K
low	310 FPS	380 FPS
medium	277 FPS	326 FPS
high	261 FPS	293 FPS
ultra	229 FPS	258 FPS

Open Ryzen 7 8745HX Open Ryzen 9 3900X

Counter-Strike 2

Counter-Strike 2

League of Legends

Preset	Ryzen 7 8745HX	Ryzen 9 3900X
1080p
low	816 FPS	813 FPS
medium	735 FPS	794 FPS
high	653 FPS	730 FPS
ultra	560 FPS	647 FPS
1440p
low	701 FPS	707 FPS
medium	564 FPS	583 FPS
high	490 FPS	522 FPS
ultra	415 FPS	459 FPS
4K
low	486 FPS	503 FPS
medium	405 FPS	403 FPS
high	364 FPS	361 FPS
ultra	304 FPS	292 FPS

Open Ryzen 7 8745HX Open Ryzen 9 3900X

League of Legends

League of Legends

Valorant

Preset	Ryzen 7 8745HX	Ryzen 9 3900X
1080p
low	816 FPS	813 FPS
medium	816 FPS	813 FPS
high	816 FPS	813 FPS
ultra	772 FPS	813 FPS
1440p
low	816 FPS	813 FPS
medium	755 FPS	813 FPS
high	663 FPS	714 FPS
ultra	579 FPS	619 FPS
4K
low	568 FPS	669 FPS
medium	509 FPS	594 FPS
high	459 FPS	525 FPS
ultra	399 FPS	437 FPS

Open Ryzen 7 8745HX Open Ryzen 9 3900X

Valorant

Valorant

Check FPS for your specific build

Technical Specifications

Side-by-side comparison of Ryzen 7 8745HX and Ryzen 9 3900X

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 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 8745HX 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 8745HX versus 4.6 GHz on the Ryzen 9 3900X — a 10.3% 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 3900X uses Matisse (Zen 2) (2019−2020) (7 nm, 12 nm). In PassMark, the Ryzen 7 8745HX scores 32,620 against the Ryzen 9 3900X's 32,517 — a 0.3% lead for the Ryzen 7 8745HX. Geekbench 6 single-core — the metric most relevant to gaming — records 2,700 vs 1,300, a 70% lead for the Ryzen 7 8745HX that directly translates to higher frame rates. Multi-core Geekbench: 13,500 vs 12,000 (11.8% advantage for the Ryzen 7 8745HX). L3 cache: 32 MB (total) on the Ryzen 7 8745HX vs 64 MB on the Ryzen 9 3900X.

Feature	Ryzen 7 8745HX	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)+100%	512K (per core)
Process	5 nm-29%	7 nm, 12 nm
Architecture	Dragon Range (2025)	Matisse (Zen 2) (2019−2020)
PassMark	32,620	32,517
Cinebench R23 Multi	18,000	—
Geekbench 6 Single	2,700+108%	1,300
Geekbench 6 Multi	13,500+13%	12,000

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Memory & Platform

The Ryzen 7 8745HX 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 8745HX versus DDR4-3200 on the Ryzen 9 3900X — the Ryzen 7 8745HX supports 22.2% 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 — 66.7% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 28 (Ryzen 7 8745HX) vs 24 (Ryzen 9 3900X) — the Ryzen 7 8745HX offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: FL1 (Ryzen 7 8745HX) and X570,B550 (Ryzen 9 3900X).

Feature	Ryzen 7 8745HX	Ryzen 9 3900X
Socket	FL1	AM4
PCIe Generation	PCIe 4.0	PCIe 4.0
Max RAM Speed	DDR5-5200+25%	DDR4-3200
Max RAM Capacity	64 GB	128 GB+100%
RAM Channels	2	2
ECC Support	No	Yes
PCIe Lanes	28+17%	24

🔧

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 3900X requires a dedicated GPU. Primary use case: Ryzen 7 8745HX targets High-end Gaming Laptop, Ryzen 9 3900X targets Workstation. Direct competitor: Ryzen 7 8745HX rivals Core i7-14700HX.