Core 2 Duo P8400 vs Core i5-4310U

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 P8400 vs Core i5-4310U 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 P8400 vs Core i5-4310U: 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 P8400

2008

Why buy it

✅Draws 3W instead of 512W, a 509W reduction.

Trade-offs

❌Lower PassMark (2,497 vs 2,525).
❌Launch MSRP is still $209 MSRP, while Core i5-4310U mostly shows up through inconsistent older-market listings.

Core i5-4310U

2014

Why buy it

Trade-offs

❌16966.7% higher power demand at 512W vs 3W.

Quick Answers

So, is Core i5-4310U better than Core 2 Duo P8400?

Yes. Core i5-4310U is the better all-around CPU here. It gives you a 1.5% average FPS lead across 50 shared CPU game tests in our data, 1.1% 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 i5-4310U is the better pick. According to our tests, it delivers 1.5% 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 i5-4310U is the stronger fit. You are getting 1.1% better PassMark, backed by 2 cores and 4 threads.

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

Core i5-4310U is still the much better call for a fresh build. Core i5-4310U comes in at an unclear MSRP at unclear MSRP versus $209 MSRP, and it still gives you a 1.5% average FPS lead across 50 shared CPU game tests in our data. Core 2 Duo P8400 only looks stronger on raw value math because it is extremely cheap, but that usually means used-market pricing on an obsolete 2008 platform. Even with 100.0% better value on paper (11.9 vs 0.0 PassMark/$), it really only makes sense as a cheap stopgap or a niche existing-platform option for someone already on PGA478.

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

Core i5-4310U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2014 vs 2008) 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 P8400 vs Core i5-4310U Technical Specifications

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

Core 2 Duo P8400

The Core 2 Duo P8400 is manufactured by Intel. It was released in 15 July 2008 (17 years ago). It is based on the Penryn (2008−2011) architecture. It features 2 cores and 2 threads. Base frequency is 2.26 GHz, with boost up to 2.26 GHz. L3 cache: 3 MB L2 Cache. L2 cache: 3 MB. Built on 45 nm process technology. Socket: PGA478. Thermal design power (TDP): 25 Watt. Passmark benchmark score: 2,497 points. Launch price was $209.

Core i5-4310U

The Core i5-4310U is manufactured by Intel. It was released in 19 January 2014 (11 years ago). It is based on the Haswell (2013−2015) architecture. It features 2 cores and 4 threads. Base frequency is 2 GHz, with boost up to 3 GHz. L3 cache: 3 MB. L2 cache: 512 kB. Built on 22 nm process technology. Socket: FCBGA1168. Thermal design power (TDP): 15 Watt. Memory support: DDR3. Passmark benchmark score: 2,525 points. Launch price was $281.

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Processing Power

The Core 2 Duo P8400 packs 2 cores / 2 threads, matching the Core i5-4310U's 2 cores. Boost clocks reach 2.26 GHz on the Core 2 Duo P8400 versus 3 GHz on the Core i5-4310U — a 28.1% clock advantage for the Core i5-4310U (base: 2.26 GHz vs 2 GHz). The Core 2 Duo P8400 uses the Penryn (2008−2011) architecture (45 nm), while the Core i5-4310U uses Haswell (2013−2015) (22 nm). In PassMark, the Core 2 Duo P8400 scores 2,497 against the Core i5-4310U's 2,525 — a 1.1% lead for the Core i5-4310U. L3 cache: 3 MB L2 Cache on the Core 2 Duo P8400 vs 3 MB on the Core i5-4310U.

Feature	Core 2 Duo P8400	Core i5-4310U
Cores / Threads	2 / 2	2 / 4
Boost Clock	2.26 GHz	3 GHz+33%
Base Clock	2.26 GHz+13%	2 GHz
L3 Cache	3 MB L2 Cache	3 MB
L2 Cache	3 MB+500%	512 kB
Process	45 nm	22 nm-51%
Architecture	Penryn (2008−2011)	Haswell (2013−2015)
PassMark	2,497	2,525+1%

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Memory & Platform

The Core 2 Duo P8400 uses the PGA478 socket (PCIe 1.1), while the Core i5-4310U uses FCBGA1168 (PCIe 3.0) — making them incompatible on the same motherboard.