Core 2 Duo T6400 vs Pentium 4405U

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 Pentium 4405U 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 Pentium 4405U: 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

✅Draws 2W instead of 512W, a 510W reduction.

Trade-offs

❌Lower PassMark (2,115 vs 2,122).

Pentium 4405U

2015

Why buy it

Trade-offs

❌25500% higher power demand at 512W vs 2W.

Quick Answers

So, is Pentium 4405U better than Core 2 Duo T6400?

Yes. Pentium 4405U is the better all-around CPU here. It gives you a 0.8% average FPS lead across 49 shared CPU game tests in our data, 0.3% 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, Pentium 4405U is the better pick. According to our tests, it delivers 0.8% more average FPS across 49 shared CPU game tests.

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

For streaming, content creation, and heavier multitasking, Pentium 4405U is the stronger fit. You are getting 0.3% better PassMark, backed by 2 cores and 4 threads.

Which one is the smarter buy today, not just the cheaper CPU?

Pentium 4405U still makes the most sense overall. Pentium 4405U comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you a 0.8% average FPS lead across 49 shared CPU game tests in our data.

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

Pentium 4405U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2015 vs 2009) and more multi-core headroom with 2 cores / 4 threads instead of 2/2. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Core 2 Duo T6400 vs Pentium 4405U 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.

Pentium 4405U

The Pentium 4405U is manufactured by Intel. It was released in 1 September 2015 (10 years ago). It is based on the NetBurst (2000−2006) architecture. It features 2 cores and 4 threads. Base frequency is 2.1 GHz, with boost up to 2.1 GHz. L3 cache: 2 MB. L2 cache: 512 kB. Built on 14 nm process technology. Socket: BGA1356. Thermal design power (TDP): 15 Watt. Memory support: DDR3, DDR4. Passmark benchmark score: 2,122 points. Launch price was $161.

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Processing Power

The Core 2 Duo T6400 packs 2 cores / 2 threads, matching the Pentium 4405U's 2 cores. Boost clocks reach 2 GHz on the Core 2 Duo T6400 versus 2.1 GHz on the Pentium 4405U — a 4.9% clock advantage for the Pentium 4405U (base: 2 GHz vs 2.1 GHz). The Core 2 Duo T6400 uses the Penryn (2008−2011) architecture (45 nm), while the Pentium 4405U uses NetBurst (2000−2006) (14 nm). In PassMark, the Core 2 Duo T6400 scores 2,115 against the Pentium 4405U's 2,122 — a 0.3% lead for the Pentium 4405U. L3 cache: 2 MB L2 Cache on the Core 2 Duo T6400 vs 2 MB on the Pentium 4405U.

Feature	Core 2 Duo T6400	Pentium 4405U
Cores / Threads	2 / 2	2 / 4
Boost Clock	2 GHz	2.1 GHz+5%
Base Clock	2 GHz	2.1 GHz+5%
L3 Cache	2 MB L2 Cache	2 MB
L2 Cache	2 MB+300%	512 kB
Process	45 nm	14 nm-69%
Architecture	Penryn (2008−2011)	NetBurst (2000−2006)
PassMark	2,115	2,122
Geekbench 6 Single	650	—
Geekbench 6 Multi	1,300	—

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Memory & Platform

The Core 2 Duo T6400 uses the PGA478 socket (PCIe 1.1), while the Pentium 4405U uses BGA1356 (PCIe 3.0) — making them incompatible on the same motherboard.