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 2 Duo T6400 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.

Core 2 Duo T6400 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.

Core 2 Duo T6400

2009

Why buy it

✅+97.9% higher Geekbench multi-core.
✅Draws 2W instead of 65W, a 63W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than Core i5-12400F across 50 shared CPU benchmark tests.
❌Smaller total L3 cache (2 MB vs 18 MB).
❌Older platform position on PGA478, while Core i5-12400F moves to LGA1700 and DDR5.
❌No boxed cooler included, unlike Core i5-12400F.

Core i5-12400F

2022

Why buy it

✅Better for gaming: +322.3% higher average FPS across 50 shared CPU benchmark tests.
✅+800% larger total L3 cache (18 MB vs 2 MB).
✅Newer platform on LGA1700 with DDR5 support instead of PGA478 and older memory support.
✅100+% more PCIe lanes (20 vs 0) for storage and expansion-heavy builds.
✅Includes a boxed cooler (Yes), unlike Core 2 Duo T6400.

Trade-offs

❌Lower Geekbench multi-core (657 vs 1,300).
❌Launch MSRP is still $174 MSRP, while Core 2 Duo T6400 mostly shows up through inconsistent older-market listings.
❌3150% higher power demand at 65W vs 2W.

Quick Answers

So, is Core i5-12400F better than Core 2 Duo T6400?

It depends on what you want from the system. For gaming, Core i5-12400F is ahead with a 322.3% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Core 2 Duo T6400 pulls ahead with 97.9% better Geekbench multi-core. Core i5-12400F also has the bigger cache pool with 800% larger total L3 cache (18 MB vs 2 MB).

Which one is better for streaming, content creation, and heavy multitasking?

For streaming, content creation, and heavier multitasking, Core 2 Duo T6400 is the stronger fit. You are getting 97.9% better Geekbench multi-core, backed by 2 cores and 2 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 $174 MSRP versus unclear MSRP, and it still gives you a 322.3% average FPS lead across 50 shared CPU game tests in our data. The compromise is that Core 2 Duo T6400 is still stronger for heavier multi-core work with 97.9% better Geekbench multi-core. It is also 100.0% better value on MSRP (112.3 vs 0.0 PassMark/$), 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 2009), a healthier platform with LGA1700 and DDR5 instead of PGA478, and 800% larger total L3 cache (18 MB vs 2 MB). That gives you a healthier platform runway for motherboard, RAM, and later CPU upgrades.

Core 2 Duo T6400 vs Core i5-12400F Technical Specifications

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

Core 2 Duo T6400

The Core 2 Duo T6400 is manufactured by Intel. It was released in 2008-01-01. It is based on the Penryn (2008−2011) architecture. It features 2 cores and 2 threads. Base frequency is 2 GHz, with boost up to 2 GHz. L3 cache: 2 MB L2 Cache. L2 cache: 2 MB. Built on 45 nm process technology. Socket: PGA478. Thermal design power (TDP): 35 Watt. Passmark benchmark score: 2,115 points. Launch price was $249.

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 Core 2 Duo T6400 packs 2 cores / 2 threads, while the Core i5-12400F offers 6 cores / 12 threads — the Core i5-12400F has 4 more cores. Boost clocks reach 2 GHz on the Core 2 Duo T6400 versus 4.4 GHz on the Core i5-12400F — a 75% clock advantage for the Core i5-12400F (base: 2 GHz vs 2.5 GHz). The Core 2 Duo T6400 uses the Penryn (2008−2011) architecture (45 nm), while the Core i5-12400F uses Alder Lake-S (2022) (Intel 7 nm). In PassMark, the Core 2 Duo T6400 scores 2,115 against the Core i5-12400F's 19,532 — a 160.9% lead for the Core i5-12400F. Geekbench 6 single-core — the metric most relevant to gaming — records 650 vs 1,700, a 89.4% lead for the Core i5-12400F that directly translates to higher frame rates. Multi-core Geekbench: 1,300 vs 657 (65.7% advantage for the Core 2 Duo T6400). L3 cache: 2 MB L2 Cache on the Core 2 Duo T6400 vs 18 MB (total) on the Core i5-12400F.

Feature	Core 2 Duo T6400	Core i5-12400F
Cores / Threads	2 / 2	6 / 12+200%
Boost Clock	2 GHz	4.4 GHz+120%
Base Clock	2 GHz	2.5 GHz+25%
L3 Cache	2 MB L2 Cache	18 MB (total)+800%
L2 Cache	2 MB+60%	1.25 MB (per core)
Process	45 nm	Intel 7 nm-84%
Architecture	Penryn (2008−2011)	Alder Lake-S (2022)
PassMark	2,115	19,532+823%
Cinebench R23 Multi	—	12,380
Geekbench 6 Single	650	1,700+162%
Geekbench 6 Multi	1,300+98%	657

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Memory & Platform

The Core 2 Duo T6400 uses the PGA478 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 DDR2-800 on the Core 2 Duo T6400 versus DDR5-4800, DDR4-3200 on the Core i5-12400F — the Core i5-12400F supports 500% 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 8 GB — 1500% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 0 (Core 2 Duo T6400) vs 20 (Core i5-12400F) — the Core i5-12400F offers 20 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Intel GM45,Intel PM45 (Core 2 Duo T6400) and H610,B660,H670,Z690,B760,H770,Z790 (Core i5-12400F).

Feature	Core 2 Duo T6400	Core i5-12400F
Socket	PGA478	LGA1700
PCIe Generation	PCIe 1.1	PCIe 3.0+173%
Max RAM Speed	DDR2-800	DDR5-4800, DDR4-3200+500%
Max RAM Capacity	8 GB	128 GB+1500%
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	0	20

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Advanced Features

Virtualization support: No (Core 2 Duo T6400) vs VT-x, VT-d, EPT (Core i5-12400F). Primary use case: Core 2 Duo T6400 targets Mobile, Core i5-12400F targets Gaming Performance/Value. Direct competitor: Core i5-12400F rivals Ryzen 5 5600.