Core i5-12400F vs Phenom II X3 P840

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.

Head-to-Head Verdict, Benchmarks, Value & Long-Term Outlook

This comparison brings together gaming FPS, productivity performance, platform differences, power efficiency, pricing context, and upgrade path so you can see which CPU actually makes more sense.

Core i5-12400F

2022

Why buy it

✅Better for gaming: +330.0% higher average FPS across 3 shared CPU benchmark tests.
✅Newer platform on LGA1700 with DDR5 support instead of S1 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 X3 P840.

Trade-offs

❌Launch MSRP is still $174 MSRP, while Phenom II X3 P840 mostly shows up through inconsistent older-market listings.
❌4233.3% higher power demand at 65W vs 1.5W.

Phenom II X3 P840

2010

Why buy it

✅Draws 2W instead of 65W, a 64W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than Core i5-12400F across 3 shared CPU benchmark tests.
❌Lower PassMark (4,425 vs 19,532).
❌Older platform position on S1, while Core i5-12400F moves to LGA1700 and DDR5.
❌No boxed cooler included, unlike Core i5-12400F.

Core i5-12400F

2022

Phenom II X3 P840

2010

Why buy it

✅Better for gaming: +330.0% higher average FPS across 3 shared CPU benchmark tests.
✅Newer platform on LGA1700 with DDR5 support instead of S1 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 X3 P840.

Why buy it

✅Draws 2W instead of 65W, a 64W reduction.

Trade-offs

❌Launch MSRP is still $174 MSRP, while Phenom II X3 P840 mostly shows up through inconsistent older-market listings.
❌4233.3% higher power demand at 65W vs 1.5W.

Trade-offs

❌Worse for gaming: lower average FPS than Core i5-12400F across 3 shared CPU benchmark tests.
❌Lower PassMark (4,425 vs 19,532).
❌Older platform position on S1, 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 X3 P840?

Yes. Core i5-12400F is the better overall CPU here. You are getting a 330.0% average FPS lead across 3 shared CPU game tests in our data, 341.4% better PassMark, and the stronger long-term platform, which makes it the stronger all-around choice.

Which one is better for gaming?

If gaming is the priority, Core i5-12400F is the better pick here. According to our tests, it delivers 330.0% more average FPS across 3 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 better fit. You are getting 341.4% 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 smarter buy today. Core i5-12400F is at an unclear MSRP at $174 MSRP versus unclear MSRP, and it gives you a 330.0% average FPS lead across 3 shared CPU game tests in our data. It is also 100.0% better value on MSRP (112.3 vs 0.0 PassMark/$), so the better CPU is not just faster, it is also the cleaner value play on paper.

Which one is more future-proof for 2026 and beyond?

Core i5-12400F is the more future-proof choice for 2026 and beyond. You are getting a newer CPU generation (2022 vs 2010), a healthier platform with LGA1700 and DDR5 instead of S1, and more multi-core headroom with 6 cores / 12 threads instead of 3/3. That should give you a better long-term upgrade path for motherboard, RAM, and future CPU swaps.

Games Benchmarks

Paired with RTX 4090

To accurately isolate CPU performance, all benchmarks below use an NVIDIA RTX 4090 as the reference GPU. This eliminates GPU-side bottlenecks and highlights pure processing throughput differences between the CPUs.

Note: Real-world results may vary based on your actual GPU. CPU performance impact is more visible in processing-intensive titles and high-refresh-rate gaming scenarios.

Core i5-12400F Benchmark Check

Phenom II X3 P840 Benchmark Check

Path of Exile 2

Preset	Core i5-12400F	Phenom II X3 P840
1080p
low	183 FPS	111 FPS
medium	168 FPS	111 FPS
high	139 FPS	98 FPS
ultra	119 FPS	76 FPS
1440p
low	153 FPS	111 FPS
medium	132 FPS	102 FPS
high	106 FPS	79 FPS
ultra	89 FPS	61 FPS
4K
low	87 FPS	63 FPS
medium	81 FPS	52 FPS
high	64 FPS	40 FPS
ultra	49 FPS	31 FPS

Open Core i5-12400F Open Phenom II X3 P840

Path of Exile 2

Path of Exile 2

Counter-Strike 2

Preset	Core i5-12400F	Phenom II X3 P840
1080p
low	471 FPS	111 FPS
medium	397 FPS	111 FPS
high	341 FPS	105 FPS
ultra	301 FPS	75 FPS
1440p
low	407 FPS	111 FPS
medium	351 FPS	96 FPS
high	309 FPS	87 FPS
ultra	265 FPS	66 FPS
4K
low	282 FPS	76 FPS
medium	248 FPS	66 FPS
high	229 FPS	47 FPS
ultra	196 FPS	32 FPS

Open Core i5-12400F Open Phenom II X3 P840

Counter-Strike 2

Counter-Strike 2

League of Legends

Preset	Core i5-12400F	Phenom II X3 P840
1080p
low	488 FPS	111 FPS
medium	488 FPS	111 FPS
high	488 FPS	111 FPS
ultra	488 FPS	111 FPS
1440p
low	488 FPS	111 FPS
medium	488 FPS	111 FPS
high	485 FPS	111 FPS
ultra	434 FPS	111 FPS
4K
low	442 FPS	111 FPS
medium	389 FPS	111 FPS
high	337 FPS	111 FPS
ultra	274 FPS	111 FPS

Open Core i5-12400F Open Phenom II X3 P840

League of Legends

League of Legends

Valorant

Preset	Core i5-12400F	Phenom II X3 P840
1080p
low	488 FPS	111 FPS
medium	488 FPS	111 FPS
high	488 FPS	111 FPS
ultra	488 FPS	111 FPS
1440p
low	488 FPS	111 FPS
medium	488 FPS	111 FPS
high	488 FPS	111 FPS
ultra	473 FPS	111 FPS
4K
low	488 FPS	111 FPS
medium	450 FPS	111 FPS
high	391 FPS	111 FPS
ultra	330 FPS	111 FPS

Open Core i5-12400F Open Phenom II X3 P840

Valorant

Valorant

Check FPS for your specific build

Technical Specifications

Side-by-side comparison of Core i5-12400F and Phenom II X3 P840

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 X3 P840

The Phenom II X3 P840 is manufactured by AMD. It was released in 2009-01-01. It is based on the Champlain (2010−2011) architecture. It features 3 cores and 3 threads. Max frequency: 1.9 GHz. L2 cache: 1.5 MB. Built on 45 nm process technology. Socket: S1. Thermal design power (TDP): 1.5 MB. Memory support: DDR3. Passmark benchmark score: 4,425 points. Launch price was $149.

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Processing Power

The Core i5-12400F packs 6 cores / 12 threads, while the Phenom II X3 P840 offers 3 cores / 3 threads — the Core i5-12400F has 3 more cores. Boost clocks reach 4.4 GHz on the Core i5-12400F versus 1.9 GHz on the Phenom II X3 P840 — a 79.4% clock advantage for the Core i5-12400F. The Core i5-12400F uses the Alder Lake-S (2022) architecture (Intel 7 nm), while the Phenom II X3 P840 uses Champlain (2010−2011) (45 nm). In PassMark, the Core i5-12400F scores 19,532 against the Phenom II X3 P840's 4,425 — a 126.1% lead for the Core i5-12400F.

Feature	Core i5-12400F	Phenom II X3 P840
Cores / Threads	6 / 12+100%	3 / 3
Boost Clock	4.4 GHz+132%	1.9 GHz
Base Clock	2.5 GHz	—
L3 Cache	18 MB (total)	—
L2 Cache	1.25 MB (per core)	1.5 MB+20%
Process	Intel 7 nm-84%	45 nm
Architecture	Alder Lake-S (2022)	Champlain (2010−2011)
PassMark	19,532+341%	4,425
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 X3 P840 uses S1 (PCIe 2.0) — making them incompatible on the same motherboard.

Feature	Core i5-12400F	Phenom II X3 P840
Socket	LGA1700	S1
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 X3 P840). Primary use case: Core i5-12400F targets Gaming Performance/Value. Direct competitor: Core i5-12400F rivals Ryzen 5 5600.