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.

Celeron 3865U vs Core i5-12400F 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.

Celeron 3865U vs Core i5-12400F: Pros, Cons & Final Verdict

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

Celeron 3865U

2017

Why buy it

✅+2.6% higher Geekbench multi-core.
✅Draws 15W instead of 65W, a 50W reduction.
✅Integrated graphics onboard with Intel HD Graphics 610, while Core i5-12400F needs a discrete GPU.

Trade-offs

❌Worse for gaming: lower average FPS than Core i5-12400F across 50 shared CPU benchmark tests.
❌Smaller total L3 cache (2 MB vs 18 MB).
❌Older platform position on BGA1356 with DDR4, while Core i5-12400F moves to LGA1700 and DDR5.
❌No boxed cooler included, unlike Core i5-12400F.

Core i5-12400F

2022

Why buy it

✅Better for gaming: +525.0% higher average FPS across 50 shared CPU benchmark tests.
✅+800% larger total L3 cache (18 MB vs 2 MB).
✅Newer platform on LGA1700 with DDR5 support instead of BGA1356 and DDR4.
✅100% more PCIe lanes (20 vs 10) for storage and expansion-heavy builds.
✅Includes a boxed cooler (Yes), unlike Celeron 3865U.

Trade-offs

❌Lower Geekbench multi-core (657 vs 674).
❌Launch MSRP is still $174 MSRP, while Celeron 3865U mostly shows up through inconsistent older-market listings.
❌333.3% higher power demand at 65W vs 15W.
❌No integrated graphics, while Celeron 3865U can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Core i5-12400F better than Celeron 3865U?

It depends on what you want from the system. For gaming, Core i5-12400F is ahead with a 525.0% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Celeron 3865U pulls ahead with 2.6% better Geekbench multi-core. Core i5-12400F also has the bigger cache pool with 800% larger total L3 cache (18 MB vs 2 MB).

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

For streaming, content creation, and heavier multitasking, Celeron 3865U is the stronger fit. You are getting 2.6% better Geekbench multi-core, backed by 2 cores and 2 threads.

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

Core i5-12400F is the better buy right now. Core i5-12400F comes in at an unclear MSRP at $174 MSRP versus unclear MSRP, and it still gives you a 525.0% average FPS lead across 50 shared CPU game tests in our data. The compromise is that Celeron 3865U is still stronger for heavier multi-core work with 2.6% better Geekbench multi-core. It is also 100.0% better value on MSRP (112.3 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Core i5-12400F makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2022 vs 2017), a healthier platform with LGA1700 and DDR5 instead of BGA1356, and 800% larger total L3 cache (18 MB vs 2 MB). That gives you a healthier platform runway for motherboard, RAM, and later CPU upgrades.

Celeron 3865U vs Core i5-12400F Technical Specifications

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

Celeron 3865U

The Celeron 3865U is manufactured by Intel. It was released in 3 January 2017 (8 years ago). It is based on the Kaby Lake-U (2017) architecture. It features 2 cores and 2 threads. Base frequency is 1.8 GHz, with boost up to 1.8 GHz. L3 cache: 2 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: BGA1356. Thermal design power (TDP): 15 Watt. Memory support: DDR3, DDR4. Passmark benchmark score: 1,343 points. Launch price was $107.

Core i5-12400F

The Core i5-12400F is manufactured by Intel. It was released in 4 January 2022 (3 years ago). It is based on the Alder Lake-S (2022) architecture. It features 6 cores and 12 threads. Base frequency is 2.5 GHz, with boost up to 4.4 GHz. L3 cache: 18 MB (total). L2 cache: 1.25 MB (per core). Built on Intel 7 nm process technology. Socket: LGA1700. Thermal design power (TDP): 65 Watt. Memory support: DDR5-4800, DDR4-3200. Passmark benchmark score: 19,532 points. Launch price was $180.

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Processing Power

The Celeron 3865U packs 2 cores / 2 threads, while the Core i5-12400F offers 6 cores / 12 threads — the Core i5-12400F has 4 more cores. Boost clocks reach 1.8 GHz on the Celeron 3865U versus 4.4 GHz on the Core i5-12400F — a 83.9% clock advantage for the Core i5-12400F (base: 1.8 GHz vs 2.5 GHz). The Celeron 3865U uses the Kaby Lake-U (2017) architecture (14 nm), while the Core i5-12400F uses Alder Lake-S (2022) (Intel 7 nm). In PassMark, the Celeron 3865U scores 1,343 against the Core i5-12400F's 19,532 — a 174.3% lead for the Core i5-12400F. Geekbench 6 single-core — the metric most relevant to gaming — records 389 vs 1,700, a 125.5% lead for the Core i5-12400F that directly translates to higher frame rates. Multi-core Geekbench: 674 vs 657 (2.6% advantage for the Celeron 3865U). L3 cache: 2 MB (total) on the Celeron 3865U vs 18 MB (total) on the Core i5-12400F.

Feature	Celeron 3865U	Core i5-12400F
Cores / Threads	2 / 2	6 / 12+200%
Boost Clock	1.8 GHz	4.4 GHz+144%
Base Clock	1.8 GHz	2.5 GHz+39%
L3 Cache	2 MB (total)	18 MB (total)+800%
L2 Cache	256K (per core)+20380%	1.25 MB (per core)
Process	14 nm	Intel 7 nm-50%
Architecture	Kaby Lake-U (2017)	Alder Lake-S (2022)
PassMark	1,343	19,532+1354%
Cinebench R23 Multi	—	12,380
Geekbench 6 Single	389	1,700+337%
Geekbench 6 Multi	674+3%	657

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Memory & Platform

The Celeron 3865U uses the BGA1356 socket (PCIe 3.0), while the Core i5-12400F uses LGA1700 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2133 / LPDDR3-1866 on the Celeron 3865U versus DDR5-4800, DDR4-3200 on the Core i5-12400F — the Core i5-12400F supports 125% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i5-12400F supports up to 128 GB of RAM compared to 32 GB — 300% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 10 (Celeron 3865U) vs 20 (Core i5-12400F) — the Core i5-12400F offers 10 more lanes for additional GPUs or NVMe drives. Chipset compatibility: 100-series,200-series (Celeron 3865U) and H610,B660,H670,Z690,B760,H770,Z790 (Core i5-12400F).

Feature	Celeron 3865U	Core i5-12400F
Socket	BGA1356	LGA1700
PCIe Generation	PCIe 3.0	PCIe 3.0
Max RAM Speed	DDR4-2133 / LPDDR3-1866	DDR5-4800, DDR4-3200+125%
Max RAM Capacity	32 GB	128 GB+300%
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	10	20+100%

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Advanced Features

Virtualization support: VT-x / VT-d / EPT (Celeron 3865U) vs VT-x, VT-d, EPT (Core i5-12400F). The Celeron 3865U includes integrated graphics (Intel HD Graphics 610), while the Core i5-12400F requires a dedicated GPU. Primary use case: Celeron 3865U targets Entry-level, Core i5-12400F targets Gaming Performance/Value. Direct competitor: Celeron 3865U rivals Pentium Gold 4415U; Core i5-12400F rivals Ryzen 5 5600.

Feature	Celeron 3865U	Core i5-12400F
Integrated GPU	Yes	No
IGPU Model	Intel HD Graphics 610	—
Unlocked	No	—
AVX-512	No	—
Virtualization	VT-x / VT-d / EPT	VT-x, VT-d, EPT
Target Use	Entry-level	Gaming Performance/Value