Athlon II X4 651 vs Core i5-12400F

Athlon II X4 651 vs Core i5-12400F Performance Spectrum

Athlon II X4 651

4 / 4

3,584

0.0%

Ryzen Threadripper 3990X

Core i5-12400F

6 / 12

19,532

+445.0%

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.

Athlon II X4 651 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.

Athlon II X4 651 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.

Athlon II X4 651

2011

Why buy it

✅Costs $82 less on MSRP ($92 MSRP vs $174 MSRP).

Trade-offs

❌Worse for gaming: lower average FPS than Core i5-12400F across 50 shared CPU benchmark tests.
❌Lower PassMark (3,584 vs 19,532).
❌Lower PassMark per dollar, at 39.0 vs 112.3 PassMark/$ ($92 MSRP vs $174 MSRP).
❌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: +175.8% higher average FPS across 50 shared CPU benchmark tests.
✅Delivers 188.1% more PassMark for each dollar spent, at 112.3 vs 39.0 PassMark/$ ($174 MSRP vs $92 MSRP).
✅Draws 65W instead of 100W, a 35W reduction.
✅Newer platform on LGA1700 with DDR5 support instead of FM1 and older memory support.
✅25% more PCIe lanes (20 vs 16) for storage and expansion-heavy builds.

Trade-offs

❌
89.1% HIGHER MSRP
$174 MSRPvs$92 MSRP

Quick Answers

So, is Core i5-12400F better than Athlon II X4 651?

Yes. Core i5-12400F is the better all-around CPU here. It gives you a 175.8% average FPS lead across 50 shared CPU game tests in our data, 445% 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 175.8% 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 445% 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 89.1% more expensive on MSRP at $174 MSRP versus $92 MSRP, and it still gives you a 175.8% average FPS lead across 50 shared CPU game tests in our data. It is also 188.1% better value on MSRP (112.3 vs 39.0 PassMark/$), 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.

Athlon II X4 651 vs Core i5-12400F Technical Specifications

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

Athlon II X4 651

The Athlon II X4 651 is manufactured by AMD. It was released in 2009-01-01. 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: 3,584 points. Launch price was $149.

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 Athlon II X4 651 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 Athlon II X4 651 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 Athlon II X4 651 uses the Llano (2011−2012) architecture (32 nm), while the Core i5-12400F uses Alder Lake-S (2022) (Intel 7 nm). In PassMark, the Athlon II X4 651 scores 3,584 against the Core i5-12400F's 19,532 — a 138% lead for the Core i5-12400F. L3 cache: 0 kB on the Athlon II X4 651 vs 18 MB (total) on the Core i5-12400F.

Feature	Athlon II X4 651	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	3,584	19,532+445%
Cinebench R23 Multi	—	12,380
Geekbench 6 Single	—	1,700
Geekbench 6 Multi	—	657

🧠

Memory & Platform

The Athlon II X4 651 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 Athlon II X4 651 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 16 GB — 700% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 16 (Athlon II X4 651) vs 20 (Core i5-12400F) — the Core i5-12400F offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: AMD FM1 (Athlon II X4 651) and H610,B660,H670,Z690,B760,H770,Z790 (Core i5-12400F).

Feature	Athlon II X4 651	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	16 GB	128 GB+700%
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	16	20+25%

🔧

Advanced Features

Virtualization: not specified (Athlon II X4 651) / VT-x, VT-d, EPT (Core i5-12400F). Primary use case: Core i5-12400F targets Gaming Performance/Value. Direct competitor: Core i5-12400F rivals Ryzen 5 5600.

Feature	Athlon II X4 651	Core i5-12400F
Integrated GPU	No	No
Virtualization	—	VT-x, VT-d, EPT
Target Use	—	Gaming Performance/Value

💰

Value Analysis

At launch, the Athlon II X4 651 was priced at $92, while the Core i5-12400F came in at $174. On launch pricing ($92 vs $174), Athlon II X4 651 was $82 cheaper. In terms of value on MSRP (PassMark points per dollar), the Athlon II X4 651 delivers 39.0 pts/$ vs 112.3 pts/$ for the Core i5-12400F — making the Core i5-12400F the 96.9% better value option.

Feature	Athlon II X4 651	Core i5-12400F
MSRP	$92-47%	$174
Performance per Dollar	39.0	112.3+188%
Release Date	2011	2022

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