Core i5-12400F vs Phenom II X4 840

Core i5-12400F vs Phenom II X4 840 Performance Spectrum

Core i5-12400F

6 / 12

19,532

+697.6%

2,449

0.0%

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

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.

Core i5-12400F vs Phenom II X4 840 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 i5-12400F vs Phenom II X4 840: Pros, Cons & Final Verdict

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

Core i5-12400F

2022

Why buy it

✅Better for gaming: +260.8% higher average FPS across 50 shared CPU benchmark tests.
✅Draws 65W instead of 95W, a 30W reduction.
✅Newer platform on LGA1700 with DDR5 support instead of AM3 and older memory support.
✅100+% more PCIe lanes (20 vs 0) for storage and expansion-heavy builds.
✅Includes a boxed cooler (Yes), unlike Phenom II X4 840.

Trade-offs

❌Launch MSRP is still $174 MSRP, while Phenom II X4 840 mostly shows up through inconsistent older-market listings.

Phenom II X4 840

2011

Why buy it

Trade-offs

❌Worse for gaming: lower average FPS than Core i5-12400F across 50 shared CPU benchmark tests.
❌Lower PassMark (2,449 vs 19,532).
❌46.2% higher power demand at 95W vs 65W.
❌Older platform position on AM3, while Core i5-12400F moves to LGA1700 and DDR5.
❌No boxed cooler included, unlike Core i5-12400F.

Quick Answers

So, is Core i5-12400F better than Phenom II X4 840?

Yes. Core i5-12400F is the better all-around CPU here. It gives you a 260.8% average FPS lead across 50 shared CPU game tests in our data, 697.6% 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 260.8% 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 697.6% 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 $174 MSRP versus unclear MSRP, and it still gives you a 260.8% average FPS lead across 50 shared CPU game tests in our data. It is also 100.0% better value on MSRP (112.3 vs 0.0 PassMark/$), 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 AM3, 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.

Core i5-12400F vs Phenom II X4 840 Technical Specifications

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

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.

Phenom II X4 840

The Phenom II X4 840 is manufactured by AMD. It was released in 4 January 2011 (14 years ago). It is based on the Propus (2009−2011) architecture. It features 4 cores and 4 threads. Base frequency is 3.2 GHz, with boost up to 3.2 GHz. L3 cache: 0 kB. L2 cache: 512 kB (per core). Built on 45 nm process technology. Socket: AM3. Thermal design power (TDP): 95 Watt. Memory support: DDR3. Passmark benchmark score: 2,449 points. Launch price was $90.

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Processing Power

The Core i5-12400F packs 6 cores / 12 threads, while the Phenom II X4 840 offers 4 cores / 4 threads — the Core i5-12400F has 2 more cores. Boost clocks reach 4.4 GHz on the Core i5-12400F versus 3.2 GHz on the Phenom II X4 840 — a 31.6% clock advantage for the Core i5-12400F (base: 2.5 GHz vs 3.2 GHz). The Core i5-12400F uses the Alder Lake-S (2022) architecture (Intel 7 nm), while the Phenom II X4 840 uses Propus (2009−2011) (45 nm). In PassMark, the Core i5-12400F scores 19,532 against the Phenom II X4 840's 2,449 — a 155.4% lead for the Core i5-12400F. L3 cache: 18 MB (total) on the Core i5-12400F vs 0 kB on the Phenom II X4 840.

Feature	Core i5-12400F	Phenom II X4 840
Cores / Threads	6 / 12+50%	4 / 4
Boost Clock	4.4 GHz+38%	3.2 GHz
Base Clock	2.5 GHz	3.2 GHz+28%
L3 Cache	18 MB (total)	0 kB
L2 Cache	1.25 MB (per core)+150%	512 kB (per core)
Process	Intel 7 nm-84%	45 nm
Architecture	Alder Lake-S (2022)	Propus (2009−2011)
PassMark	19,532+698%	2,449
Cinebench R23 Multi	12,380	—
Geekbench 6 Single	1,700	—
Geekbench 6 Multi	657	—

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Memory & Platform

The Core i5-12400F uses the LGA1700 socket (PCIe 3.0), while the Phenom II X4 840 uses AM3 (PCIe 2.0) — making them incompatible on the same motherboard.

Feature	Core i5-12400F	Phenom II X4 840
Socket	LGA1700	AM3
PCIe Generation	PCIe 3.0+50%	PCIe 2.0
Max RAM Speed	DDR5-4800, DDR4-3200	—
Max RAM Capacity	128 GB	—
RAM Channels	2	—
ECC Support	No	—
PCIe Lanes	20	—

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Advanced Features

Virtualization: VT-x, VT-d, EPT (Core i5-12400F) / not specified (Phenom II X4 840). Primary use case: Core i5-12400F targets Gaming Performance/Value. Direct competitor: Core i5-12400F rivals Ryzen 5 5600.