Core 2 Duo P8400 vs Xeon L7455

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 Xeon L7455 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 Xeon L7455: 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

✅+0.1% higher PassMark.
✅Draws 3W instead of 65W, a 62W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than Xeon L7455 across 50 shared CPU benchmark tests.
❌Smaller total L3 cache (3 MB vs 12 MB).
❌Launch MSRP is still $209 MSRP, while Xeon L7455 mostly shows up through inconsistent older-market listings.

Xeon L7455

2008

Why buy it

✅Better for gaming: +12.7% higher average FPS across 50 shared CPU benchmark tests.
✅+300% larger total L3 cache (12 MB vs 3 MB).

Trade-offs

❌Lower PassMark (2,494 vs 2,497).
❌2066.7% higher power demand at 65W vs 3W.

Quick Answers

So, is Core 2 Duo P8400 better than Xeon L7455?

Not really, because they are built for different jobs. Xeon L7455 makes more sense for workstation-style multi-core throughput, while Core 2 Duo P8400 is the more practical desktop choice for gaming, platform cost, and everyday use.

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

For streaming, content creation, and heavier multitasking, Core 2 Duo P8400 is the stronger fit. You are getting 0.1% better PassMark, backed by 2 cores and 2 threads.

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

Core 2 Duo P8400 is the better buy right now. Core 2 Duo P8400 comes in at an unclear MSRP at $209 MSRP versus unclear MSRP, and it still gives you 0.1% better PassMark. The compromise is that Xeon L7455 is still the better pure gaming CPU with a 12.7% average FPS lead across 50 shared CPU game tests in our data. It is also 100.0% better value on MSRP (11.9 vs 0.0 PassMark/$), 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 2 Duo P8400 is the safer long-term CPU choice because it gives you more room to grow and a better platform outlook.

Core 2 Duo P8400 vs Xeon L7455 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.

Xeon L7455

The Xeon L7455 is manufactured by Intel. It was released in 2015-01-01. Base frequency: 2.13 GHz. L3 cache: 12 MB L2 Cache. Built on 45 nm process technology. Socket: PGA604. Thermal design power (TDP): 65 Watt. Passmark benchmark score: 2,494 points. Launch price was $800.

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Processing Power

The Core 2 Duo P8400 is built on the Penryn (2008−2011) architecture. In PassMark, the Core 2 Duo P8400 scores 2,497 against the Xeon L7455's 2,494 — a 0.1% lead for the Core 2 Duo P8400. L3 cache: 3 MB L2 Cache on the Core 2 Duo P8400 vs 12 MB L2 Cache on the Xeon L7455.

Feature	Core 2 Duo P8400	Xeon L7455
Cores / Threads	2 / 2	—
Boost Clock	2.26 GHz	—
Base Clock	2.26 GHz+6%	2.13 GHz
L3 Cache	3 MB L2 Cache	12 MB L2 Cache+300%
L2 Cache	3 MB	—
Process	45 nm	45 nm
Architecture	Penryn (2008−2011)	—
PassMark	2,497	2,494

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Memory & Platform

The Core 2 Duo P8400 uses the PGA478 socket (PCIe 1.1), while the Xeon L7455 uses PGA604 (PCIe 2.0) — making them incompatible on the same motherboard.