Athlon 64 FX-51 vs Core i5-12400F

CPU

GPU

Athlon 64 FX-51

1 Cores1 Thrd89 WWMax: 2.2 GHz2003

Similar parts

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Core i5-12400F

6 Cores12 Thrd65 WWMax: 4.4 GHz2022

Core family

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Athlon 64 FX-51 vs Core i5-12400F Performance Spectrum

Athlon 64 FX-51

1 / 1

615

0.0%

Ryzen Threadripper PRO 3955WX

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Core i5-12400F

6 / 12

19,532

+3075.9%

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 64 FX-51 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 64 FX-51 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 64 FX-51

2003

Why buy it

Trade-offs

❌Worse for gaming: lower average FPS than Core i5-12400F across 50 shared CPU benchmark tests.
❌Lower PassMark (615 vs 19,532).
❌Lower PassMark per dollar, at 0.8 vs 112.3 PassMark/$ ($733 MSRP vs $174 MSRP).
❌36.9% higher power demand at 89W vs 65W.
❌Older platform position on 940, while Core i5-12400F moves to LGA1700 and DDR5.

Core i5-12400F

2022

Why buy it

✅Better for gaming: +1266.6% higher average FPS across 50 shared CPU benchmark tests.
✅Costs $559 less on MSRP ($174 MSRP vs $733 MSRP).
✅Delivers 13279.1% more PassMark for each dollar spent, at 112.3 vs 0.8 PassMark/$ ($174 MSRP vs $733 MSRP).
✅Draws 65W instead of 89W, a 24W reduction.
✅Newer platform on LGA1700 with DDR5 support instead of 940 and older memory support.

Trade-offs

❌Fewer obvious downsides in this matchup outside of normal market pricing swings.

Quick Answers

So, is Core i5-12400F better than Athlon 64 FX-51?

Yes. Core i5-12400F is the better all-around CPU here. It gives you a 1266.6% average FPS lead across 50 shared CPU game tests in our data, 3075.9% 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 1266.6% 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 3075.9% 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 $559 cheaper on MSRP at $174 MSRP versus $733 MSRP, and it still gives you a 1266.6% average FPS lead across 50 shared CPU game tests in our data. It is also 13279.1% better value on MSRP (112.3 vs 0.8 PassMark/$), 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 2003), a healthier platform with LGA1700 and DDR5 instead of 940, and more multi-core headroom with 6 cores / 12 threads instead of 1/1. That gives you a healthier platform runway for motherboard, RAM, and later CPU upgrades.

Athlon 64 FX-51 vs Core i5-12400F Technical Specifications

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

Athlon 64 FX-51

The Athlon 64 FX-51 is manufactured by AMD. It was released in 2009-01-01. It is based on the SledgeHammer (2003−2005) architecture. It features 1 cores and 1 threads. Max frequency: 2.2 GHz. L3 cache: 0 kB. L2 cache: 1 MB. Built on 130 nm process technology. Socket: 940. Thermal design power (TDP): 89 Watt. Passmark benchmark score: 615 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.

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Processing Power

The Athlon 64 FX-51 packs 1 cores / 1 threads, while the Core i5-12400F offers 6 cores / 12 threads — the Core i5-12400F has 5 more cores. Boost clocks reach 2.2 GHz on the Athlon 64 FX-51 versus 4.4 GHz on the Core i5-12400F — a 66.7% clock advantage for the Core i5-12400F. The Athlon 64 FX-51 uses the SledgeHammer (2003−2005) architecture (130 nm), while the Core i5-12400F uses Alder Lake-S (2022) (Intel 7 nm). In PassMark, the Athlon 64 FX-51 scores 615 against the Core i5-12400F's 19,532 — a 187.8% lead for the Core i5-12400F. L3 cache: 0 kB on the Athlon 64 FX-51 vs 18 MB (total) on the Core i5-12400F.

Feature	Athlon 64 FX-51	Core i5-12400F
Cores / Threads	1 / 1	6 / 12+500%
Boost Clock	2.2 GHz	4.4 GHz+100%
Base Clock	—	2.5 GHz
L3 Cache	0 kB	18 MB (total)
L2 Cache	1 MB	1.25 MB (per core)+25%
Process	130 nm	Intel 7 nm-95%
Architecture	SledgeHammer (2003−2005)	Alder Lake-S (2022)
PassMark	615	19,532+3076%
Cinebench R23 Multi	—	12,380
Geekbench 6 Single	—	1,700
Geekbench 6 Multi	—	657

🧠

Memory & Platform

The Athlon 64 FX-51 uses the 940 socket (PCIe 1.1), while the Core i5-12400F uses LGA1700 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR-400 on the Athlon 64 FX-51 versus DDR5-4800, DDR4-3200 on the Core i5-12400F — the Core i5-12400F supports -1300% 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 4 GB — 3100% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 0 (Athlon 64 FX-51) vs 20 (Core i5-12400F) — the Core i5-12400F offers 20 more lanes for additional GPUs or NVMe drives. Chipset compatibility: AMD 940 (Athlon 64 FX-51) and H610,B660,H670,Z690,B760,H770,Z790 (Core i5-12400F).

Feature	Athlon 64 FX-51	Core i5-12400F
Socket	940	LGA1700
PCIe Generation	PCIe 1.1	PCIe 3.0+173%
Max RAM Speed	DDR-400	DDR5-4800, DDR4-3200
Max RAM Capacity	4 GB	128 GB+3100%
RAM Channels	2	2
ECC Support	Yes	No
PCIe Lanes	0	20

🔧

Advanced Features

Virtualization: not specified (Athlon 64 FX-51) / 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 64 FX-51	Core i5-12400F
Integrated GPU	No	No
Virtualization	—	VT-x, VT-d, EPT
Target Use	—	Gaming Performance/Value

💰

Value Analysis

At launch, the Athlon 64 FX-51 was priced at $733, while the Core i5-12400F came in at $174. On launch pricing ($733 vs $174), Core i5-12400F was $559 cheaper. In terms of value on MSRP (PassMark points per dollar), the Athlon 64 FX-51 delivers 0.8 pts/$ vs 112.3 pts/$ for the Core i5-12400F — making the Core i5-12400F the 197% better value option.

Feature	Athlon 64 FX-51	Core i5-12400F
MSRP	$733	$174-76%
Performance per Dollar	0.8	112.3+13938%
Release Date	2003	2022

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