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 i3-8145UE 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.

Core i3-8145UE 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.

Core i3-8145UE

2018

Why buy it

✅Draws 15W instead of 65W, a 50W reduction.
✅Integrated graphics onboard with UHD 620, 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.
❌Lower Cinebench R23 multi-core (2,356 vs 12,380).
❌Smaller total L3 cache (4 MB vs 18 MB).
❌Lower PassMark per dollar, at 14.3 vs 112.3 PassMark/$ ($281 MSRP vs $174 MSRP).
❌Older platform position on FCBGA1528 with DDR4, while Core i5-12400F moves to LGA1700 and DDR5.

Core i5-12400F

2022

Why buy it

✅Better for gaming: +168.1% higher average FPS across 50 shared CPU benchmark tests.
✅+350% larger total L3 cache (18 MB vs 4 MB).
✅Costs $107 less on MSRP ($174 MSRP vs $281 MSRP).
✅Delivers 684.5% more PassMark for each dollar spent, at 112.3 vs 14.3 PassMark/$ ($174 MSRP vs $281 MSRP).
✅Newer platform on LGA1700 with DDR5 support instead of FCBGA1528 and DDR4.

Trade-offs

❌333.3% higher power demand at 65W vs 15W.
❌No integrated graphics, while Core i3-8145UE can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Core i5-12400F better than Core i3-8145UE?

Yes. Core i5-12400F is the better all-around CPU here. It gives you a 168.1% average FPS lead across 50 shared CPU game tests in our data, 425.5% better Cinebench R23 multi-core, 385.7% higher PassMark, and the stronger long-term platform, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Core i5-12400F is the better pick. According to our tests, it delivers 168.1% 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, Core i5-12400F is the stronger fit. You are getting 425.5% better Cinebench R23 multi-core, backed by 6 cores and 12 threads. It also has the larger cache pool with 350% larger total L3 cache (18 MB vs 4 MB).

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 $107 cheaper on MSRP at $174 MSRP versus $281 MSRP, and it still gives you a 168.1% average FPS lead across 50 shared CPU game tests in our data. It is also 684.5% better value on MSRP (112.3 vs 14.3 PassMark/$), 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 2018), a healthier platform with LGA1700 and DDR5 instead of FCBGA1528, 350% larger total L3 cache (18 MB vs 4 MB), and more multi-core headroom with 6 cores / 12 threads instead of 2/4. That gives you a healthier platform runway for motherboard, RAM, and later CPU upgrades.

Core i3-8145UE vs Core i5-12400F Technical Specifications

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

Core i3-8145UE

The Core i3-8145UE is manufactured by Intel. It was released in 1 October 2018 (7 years ago). It is based on the Whiskey Lake-U (2018−2019) architecture. It features 2 cores and 4 threads. Base frequency is 2.2 GHz, with boost up to 3.9 GHz. L3 cache: 4 MB (total). L2 cache: 256 kB (per core). Built on 10 nm process technology. Socket: FCBGA1528. Thermal design power (TDP): 15 Watt. Memory support: DDR4. Passmark benchmark score: 4,021 points. Launch price was $69.

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.

⚡

Processing Power

The Core i3-8145UE packs 2 cores / 4 threads, while the Core i5-12400F offers 6 cores / 12 threads — the Core i5-12400F has 4 more cores. Boost clocks reach 3.9 GHz on the Core i3-8145UE versus 4.4 GHz on the Core i5-12400F — a 12% clock advantage for the Core i5-12400F (base: 2.2 GHz vs 2.5 GHz). The Core i3-8145UE uses the Whiskey Lake-U (2018−2019) architecture (10 nm), while the Core i5-12400F uses Alder Lake-S (2022) (Intel 7 nm). In PassMark, the Core i3-8145UE scores 4,021 against the Core i5-12400F's 19,532 — a 131.7% lead for the Core i5-12400F. Cinebench R23 multi-core: 2,356 vs 12,380 (136% advantage for the Core i5-12400F). Geekbench 6 single-core — the metric most relevant to gaming — records 1,218 vs 1,700, a 33% lead for the Core i5-12400F that directly translates to higher frame rates. Multi-core Geekbench: 2,356 vs 657 (112.8% advantage for the Core i3-8145UE). L3 cache: 4 MB (total) on the Core i3-8145UE vs 18 MB (total) on the Core i5-12400F.

Feature	Core i3-8145UE	Core i5-12400F
Cores / Threads	2 / 4	6 / 12+200%
Boost Clock	3.9 GHz	4.4 GHz+13%
Base Clock	2.2 GHz	2.5 GHz+14%
L3 Cache	4 MB (total)	18 MB (total)+350%
L2 Cache	256 kB (per core)	1.25 MB (per core)+400%
Process	10 nm	Intel 7 nm-30%
Architecture	Whiskey Lake-U (2018−2019)	Alder Lake-S (2022)
PassMark	4,021	19,532+386%
Cinebench R23 Multi	2,356	12,380+425%
Geekbench 6 Single	1,218	1,700+40%
Geekbench 6 Multi	2,356+259%	657

🧠

Memory & Platform

The Core i3-8145UE uses the FCBGA1528 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 DDR4-2400 on the Core i3-8145UE versus DDR5-4800, DDR4-3200 on the Core i5-12400F — the Core i5-12400F supports 100% 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 64 GB — 100% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 16 (Core i3-8145UE) vs 20 (Core i5-12400F) — the Core i5-12400F offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Whiskey Lake (Core i3-8145UE) and H610,B660,H670,Z690,B760,H770,Z790 (Core i5-12400F).

Feature	Core i3-8145UE	Core i5-12400F
Socket	FCBGA1528	LGA1700
PCIe Generation	PCIe 3.0	PCIe 3.0
Max RAM Speed	DDR4-2400	DDR5-4800, DDR4-3200+100%
Max RAM Capacity	64 GB	128 GB+100%
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	16	20+25%

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Advanced Features

Virtualization support: VT-x, VT-d (Core i3-8145UE) vs VT-x, VT-d, EPT (Core i5-12400F). The Core i3-8145UE includes integrated graphics (UHD 620), while the Core i5-12400F requires a dedicated GPU. Primary use case: Core i3-8145UE targets Budget, Core i5-12400F targets Gaming Performance/Value. Direct competitor: Core i3-8145UE rivals Ryzen 3 3200U; Core i5-12400F rivals Ryzen 5 5600.

Feature	Core i3-8145UE	Core i5-12400F
Integrated GPU	Yes	No
IGPU Model	UHD 620	—
Unlocked	No	—
AVX-512	No	—
Virtualization	VT-x, VT-d	VT-x, VT-d, EPT
Target Use	Budget	Gaming Performance/Value

💰

Value Analysis

At launch, the Core i3-8145UE was priced at $281, while the Core i5-12400F came in at $174. On launch pricing ($281 vs $174), Core i5-12400F was $107 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core i3-8145UE delivers 14.3 pts/$ vs 112.3 pts/$ for the Core i5-12400F — making the Core i5-12400F the 154.8% better value option.

Feature	Core i3-8145UE	Core i5-12400F
MSRP	$281	$174-38%
Performance per Dollar	14.3	112.3+685%
Release Date	2018	2022

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