Core i9-12900HX vs Ryzen 9 3900X

CPU

GPU

Core i9-12900HX

16 Cores24 Thrd55 WWMax: 5 GHz2022

Core family

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Ryzen 9 3900X

12 Cores24 Thrd105 WWMax: 4.6 GHz2019

Ryzen family

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Core i9-12900HX vs Ryzen 9 3900X Performance Spectrum

Core i9-12900HX

16 / 24

33,018

+1.5%

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.

Core i9-12900HX 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.

Core i9-12900HX 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.

Core i9-12900HX

2022

Why buy it

✅+21.8% higher Geekbench multi-core.
✅Draws 55W instead of 105W, a 50W reduction.
✅Newer platform on FCBGA1964 with DDR5 support instead of AM4 and DDR4.
✅100% more PCIe lanes (48 vs 24) for storage and expansion-heavy builds.
✅Integrated graphics onboard with UHD Graphics 770, 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 (30 MB vs 64 MB).
❌Lower PassMark per dollar, at 54.5 vs 65.2 PassMark/$ ($606 MSRP vs $499 MSRP).

Ryzen 9 3900X

2019

Why buy it

✅Better for gaming: +20.1% higher average FPS across 50 shared CPU benchmark tests.
✅+113.3% larger total L3 cache (64 MB vs 30 MB).
✅Costs $107 less on MSRP ($499 MSRP vs $606 MSRP).
✅Delivers 19.6% more PassMark for each dollar spent, at 65.2 vs 54.5 PassMark/$ ($499 MSRP vs $606 MSRP).

Trade-offs

❌Lower Geekbench multi-core (12,000 vs 14,620).
❌90.9% higher power demand at 105W vs 55W.
❌Older platform position on AM4 with DDR4, while Core i9-12900HX moves to FCBGA1964 and DDR5.
❌No integrated graphics, while Core i9-12900HX can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Core i9-12900HX better than Ryzen 9 3900X?

It depends on what you want from the system. For gaming, Ryzen 9 3900X is ahead with a 20.1% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Core i9-12900HX pulls ahead with 21.8% better Geekbench multi-core. Ryzen 9 3900X also has the bigger cache pool with 113.3% larger total L3 cache (64 MB vs 30 MB).

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

For streaming, content creation, and heavier multitasking, Core i9-12900HX is the stronger fit. You are getting 21.8% better Geekbench multi-core, backed by 16 cores and 24 threads.

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

Core i9-12900HX is still the faster CPU overall, but Ryzen 9 3900X is easier to justify if budget matters more than peak performance. Core i9-12900HX comes in 21.4% more expensive on MSRP at $606 MSRP versus $499 MSRP, and it still gives you 21.8% better Geekbench multi-core. The compromise is that Ryzen 9 3900X is still the better pure gaming CPU with a 20.1% average FPS lead across 50 shared CPU game tests in our data. Ryzen 9 3900X is also 19.6% better value on MSRP (65.2 vs 54.5 PassMark/$), which is why it can still make sense for tighter-budget builds on paper.

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

Core i9-12900HX makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2022 vs 2019), a healthier platform with FCBGA1964 and DDR5 instead of AM4, and more multi-core headroom with 16 cores / 24 threads instead of 12/24. That gives you a healthier platform runway for motherboard, RAM, and later CPU upgrades.

Core i9-12900HX vs Ryzen 9 3900X Technical Specifications

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

Core i9-12900HX

The Core i9-12900HX is manufactured by Intel. It was released in 10 May 2022 (3 years ago). It is based on the Alder Lake-HX (2022) architecture. It features 16 cores and 24 threads. Base frequency is 2.3 GHz, with boost up to 5 GHz. L3 cache: 30 MB (total). L2 cache: 1.25 MB (per core). Built on Intel 7 nm process technology. Socket: FCBGA1964. Thermal design power (TDP): 55 Watt. Memory support: DDR4, DDR5. Passmark benchmark score: 33,018 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 Core i9-12900HX packs 16 cores / 24 threads, while the Ryzen 9 3900X offers 12 cores / 24 threads — the Core i9-12900HX has 4 more cores. Boost clocks reach 5 GHz on the Core i9-12900HX versus 4.6 GHz on the Ryzen 9 3900X — a 8.3% clock advantage for the Core i9-12900HX (base: 2.3 GHz vs 3.8 GHz). The Core i9-12900HX uses the Alder Lake-HX (2022) architecture (Intel 7 nm), while the Ryzen 9 3900X uses Matisse (Zen 2) (2019−2020) (7 nm, 12 nm). In PassMark, the Core i9-12900HX scores 33,018 against the Ryzen 9 3900X's 32,517 — a 1.5% lead for the Core i9-12900HX. Geekbench 6 single-core — the metric most relevant to gaming — records 2,426 vs 1,300, a 60.4% lead for the Core i9-12900HX that directly translates to higher frame rates. Multi-core Geekbench: 14,620 vs 12,000 (19.7% advantage for the Core i9-12900HX). L3 cache: 30 MB (total) on the Core i9-12900HX vs 64 MB on the Ryzen 9 3900X.

Feature	Core i9-12900HX	Ryzen 9 3900X
Cores / Threads	16 / 24+33%	12 / 24
Boost Clock	5 GHz+9%	4.6 GHz
Base Clock	2.3 GHz	3.8 GHz+65%
L3 Cache	30 MB (total)	64 MB+113%
L2 Cache	1.25 MB (per core)	512K (per core)+40860%
Process	Intel 7 nm	7 nm, 12 nm
Architecture	Alder Lake-HX (2022)	Matisse (Zen 2) (2019−2020)
PassMark	33,018+2%	32,517
Cinebench R23 Multi	23,150	—
Geekbench 6 Single	2,426+87%	1,300
Geekbench 6 Multi	14,620+22%	12,000

🧠

Memory & Platform

The Core i9-12900HX uses the FCBGA1964 socket (PCIe 5.0), while the Ryzen 9 3900X uses AM4 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR5-4800, DDR4-3200 on the Core i9-12900HX versus DDR4-3200 on the Ryzen 9 3900X — the Core i9-12900HX supports 50% faster memory, which can translate to measurable gains in memory-sensitive workloads. Both support up to 128 GB of RAM. Both feature 2-channel memory with ECC support. PCIe lanes: 48 (Core i9-12900HX) vs 24 (Ryzen 9 3900X) — the Core i9-12900HX offers 24 more lanes for additional GPUs or NVMe drives. Chipset compatibility: HM670,WM690 (Core i9-12900HX) and X570,B550 (Ryzen 9 3900X).

Feature	Core i9-12900HX	Ryzen 9 3900X
Socket	FCBGA1964	AM4
PCIe Generation	PCIe 5.0+25%	PCIe 4.0
Max RAM Speed	DDR5-4800, DDR4-3200+50%	DDR4-3200
Max RAM Capacity	128 GB	128 GB
RAM Channels	2	2
ECC Support	No	Yes
PCIe Lanes	48+100%	24

🔧

Advanced Features

Both processors feature an unlocked multiplier for overclocking. Virtualization support: VT-x, VT-d, EPT (Core i9-12900HX) vs AMD-V (Ryzen 9 3900X). The Core i9-12900HX includes integrated graphics (UHD Graphics 770), while the Ryzen 9 3900X requires a dedicated GPU. Primary use case: Core i9-12900HX targets High-end Mobile Performance, Ryzen 9 3900X targets Workstation. Direct competitor: Core i9-12900HX rivals Ryzen 9 6900HX.

Feature	Core i9-12900HX	Ryzen 9 3900X
Integrated GPU	Yes	No
IGPU Model	UHD Graphics 770	None
Unlocked	Yes	Yes
AVX-512	No	No
Virtualization	VT-x, VT-d, EPT	AMD-V
Target Use	High-end Mobile Performance	Workstation

💰

Value Analysis

At launch, the Core i9-12900HX was priced at $606, while the Ryzen 9 3900X came in at $499. On launch pricing ($606 vs $499), Ryzen 9 3900X was $107 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core i9-12900HX delivers 54.5 pts/$ vs 65.2 pts/$ for the Ryzen 9 3900X — making the Ryzen 9 3900X the 17.9% better value option.

Feature	Core i9-12900HX	Ryzen 9 3900X
MSRP	$606	$499-18%
Performance per Dollar	54.5	65.2+20%
Release Date	2022	2019

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