A8-3870K vs Core i5-12400F

CPU

GPU

A8-3870K

4 Cores4 Thrd100 WWMax: 3 GHz2011

Similar parts

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Core i5-12400F

6 Cores12 Thrd65 WWMax: 4.4 GHz2022

Core family

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A8-3870K vs Core i5-12400F Performance Spectrum

A8-3870K

4 / 4

2,360

0.0%

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Core i5-12400F

6 / 12

19,532

+727.6%

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.

A8-3870K 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.

A8-3870K 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.

A8-3870K

2011

Why buy it

✅Integrated graphics onboard with Radeon HD 6550D, 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 PassMark (2,360 vs 19,532).
❌53.8% higher power demand at 100W vs 65W.
❌Older platform position on FM1, while Core i5-12400F moves to LGA1700 and DDR5.

Core i5-12400F

2022

Why buy it

✅Better for gaming: +275.0% higher average FPS across 50 shared CPU benchmark tests.
✅Draws 65W instead of 100W, a 35W reduction.
✅Newer platform on LGA1700 with DDR5 support instead of FM1 and older memory support.

Trade-offs

❌Launch MSRP is still $174 MSRP, while A8-3870K mostly shows up through inconsistent older-market listings.
❌No integrated graphics, while A8-3870K can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Core i5-12400F better than A8-3870K?

Yes. Core i5-12400F is the better all-around CPU here. It gives you a 275.0% average FPS lead across 50 shared CPU game tests in our data, 727.6% better 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 275.0% 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 727.6% better PassMark, backed by 6 cores and 12 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 $174 MSRP versus unclear MSRP, and it still gives you a 275.0% average FPS lead across 50 shared CPU game tests in our data. It is also 100.0% better value on MSRP (112.3 vs 0.0 PassMark/$), 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 2011), a healthier platform with LGA1700 and DDR5 instead of FM1, and more multi-core headroom with 6 cores / 12 threads instead of 4/4. That gives you a healthier platform runway for motherboard, RAM, and later CPU upgrades.

A8-3870K vs Core i5-12400F Technical Specifications

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

A8-3870K

The A8-3870K is manufactured by AMD. It was released in 2014-01-01. It is based on the Llano (2011−2012) architecture. It features 4 cores and 4 threads. Base frequency is 3 GHz, with boost up to 3 GHz. L3 cache: 0 kB. L2 cache: 1 MB (per core). Built on 32 nm process technology. Socket: FM1. Thermal design power (TDP): 100 Watt. Memory support: DDR3. Passmark benchmark score: 2,360 points. Launch price was $90.

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 A8-3870K packs 4 cores / 4 threads, while the Core i5-12400F offers 6 cores / 12 threads — the Core i5-12400F has 2 more cores. Boost clocks reach 3 GHz on the A8-3870K versus 4.4 GHz on the Core i5-12400F — a 37.8% clock advantage for the Core i5-12400F (base: 3 GHz vs 2.5 GHz). The A8-3870K uses the Llano (2011−2012) architecture (32 nm), while the Core i5-12400F uses Alder Lake-S (2022) (Intel 7 nm). In PassMark, the A8-3870K scores 2,360 against the Core i5-12400F's 19,532 — a 156.9% lead for the Core i5-12400F. Geekbench 6 single-core — the metric most relevant to gaming — records 380 vs 1,700, a 126.9% lead for the Core i5-12400F that directly translates to higher frame rates. L3 cache: 0 kB on the A8-3870K vs 18 MB (total) on the Core i5-12400F.

Feature	A8-3870K	Core i5-12400F
Cores / Threads	4 / 4	6 / 12+50%
Boost Clock	3 GHz	4.4 GHz+47%
Base Clock	3 GHz+20%	2.5 GHz
L3 Cache	0 kB	18 MB (total)
L2 Cache	1 MB (per core)	1.25 MB (per core)+25%
Process	32 nm	Intel 7 nm-78%
Architecture	Llano (2011−2012)	Alder Lake-S (2022)
PassMark	2,360	19,532+728%
Cinebench R23 Multi	—	12,380
Geekbench 6 Single	380	1,700+347%
Geekbench 6 Multi	—	657

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Memory & Platform

The A8-3870K uses the FM1 socket (PCIe 2.0), while the Core i5-12400F uses LGA1700 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3-1866 on the A8-3870K versus DDR5-4800, DDR4-3200 on the Core i5-12400F — the Core i5-12400F supports 157.2% 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. Both provide 20 PCIe lanes. Chipset compatibility: A55,A75 (A8-3870K) and H610,B660,H670,Z690,B760,H770,Z790 (Core i5-12400F).

Feature	A8-3870K	Core i5-12400F
Socket	FM1	LGA1700
PCIe Generation	PCIe 2.0	PCIe 3.0+50%
Max RAM Speed	DDR3-1866	DDR5-4800, DDR4-3200+157%
Max RAM Capacity	32 GB	128 GB+300%
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	20	20

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Advanced Features

Virtualization support: AMD-V (A8-3870K) vs VT-x, VT-d, EPT (Core i5-12400F). The A8-3870K includes integrated graphics (Radeon HD 6550D), while the Core i5-12400F requires a dedicated GPU. Primary use case: A8-3870K targets Budget Gaming Desktop, Core i5-12400F targets Gaming Performance/Value. Direct competitor: A8-3870K rivals Core i3-2125; Core i5-12400F rivals Ryzen 5 5600.

Feature	A8-3870K	Core i5-12400F
Integrated GPU	Yes	No
IGPU Model	Radeon HD 6550D	—
Unlocked	Yes	—
AVX-512	No	—
Virtualization	AMD-V	VT-x, VT-d, EPT
Target Use	Budget Gaming Desktop	Gaming Performance/Value