Core 2 Duo SL9400 vs Xeon L5420

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 SL9400 vs Xeon L5420 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 SL9400 vs Xeon L5420: 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 SL9400

2008

Why buy it

✅+0% higher PassMark.
✅Draws 6W instead of 50W, a 44W reduction.
✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.

Trade-offs

❌Worse for gaming: lower average FPS than Xeon L5420 across 50 shared CPU benchmark tests.
❌Smaller total L3 cache (6 MB vs 12 MB).
❌Less compelling for workstation-style loads than Xeon L5420, which brings 4 cores / 4 threads.
❌Launch MSRP is still $284 MSRP, while Xeon L5420 mostly shows up through inconsistent older-market listings.

Xeon L5420

2008

Why buy it

✅Better for gaming: +4.4% higher average FPS across 50 shared CPU benchmark tests.
✅+100% larger total L3 cache (12 MB vs 6 MB).
✅Better for workstations and heavier parallel workloads: 4 cores / 4 threads.

Trade-offs

❌Lower PassMark (2,143 vs 2,144).
❌733.3% higher power demand at 50W vs 6W.

Quick Answers

So, is Core 2 Duo SL9400 better than Xeon L5420?

Not really, because they are built for different jobs. Xeon L5420 makes more sense for workstation-style multi-core throughput, while Core 2 Duo SL9400 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 SL9400 is the stronger fit. You are getting 0% better PassMark, backed by 2 cores and 2 threads.

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

Core 2 Duo SL9400 is the better buy right now. Core 2 Duo SL9400 comes in at an unclear MSRP at $284 MSRP versus unclear MSRP, and it still gives you 0% better PassMark. The compromise is that Xeon L5420 is still the better pure gaming CPU with a 4.4% average FPS lead across 50 shared CPU game tests in our data. It is also 100.0% better value on MSRP (7.5 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Xeon L5420 is the safer long-term CPU choice because it gives you more room to grow and a better platform outlook.

Core 2 Duo SL9400 vs Xeon L5420 Technical Specifications

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

Core 2 Duo SL9400

The Core 2 Duo SL9400 is manufactured by Intel. It was released in 20 August 2008 (17 years ago). It is based on the Penryn (2008−2011) architecture. It features 2 cores and 2 threads. Base frequency is 1.86 GHz, with boost up to 1.86 GHz. L3 cache: 6 MB L2 Cache. L2 cache: 6 MB. Built on 45 nm process technology. Socket: BGA956. Thermal design power (TDP): 17 Watt. Passmark benchmark score: 2,144 points. Launch price was $284.

Xeon L5420

The Xeon L5420 is manufactured by Intel. It was released in 25 March 2008 (17 years ago). It is based on the Harpertown (2007−2008) architecture. It features 4 cores and 4 threads. Base frequency is 2.5 GHz, with boost up to 2.5 GHz. L3 cache: 12 MB L2 Cache. L2 cache: 6 MB (total). Built on 45 nm process technology. Socket: LGA771. Thermal design power (TDP): 50 Watt. Memory support: DDR2, DDR3 Depends on motherboard. Passmark benchmark score: 2,143 points. Launch price was $380.

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Processing Power

The Core 2 Duo SL9400 packs 2 cores / 2 threads, while the Xeon L5420 offers 4 cores / 4 threads — the Xeon L5420 has 2 more cores. Boost clocks reach 1.86 GHz on the Core 2 Duo SL9400 versus 2.5 GHz on the Xeon L5420 — a 29.4% clock advantage for the Xeon L5420 (base: 1.86 GHz vs 2.5 GHz). The Core 2 Duo SL9400 uses the Penryn (2008−2011) architecture (45 nm), while the Xeon L5420 uses Harpertown (2007−2008) (45 nm). In PassMark, the Core 2 Duo SL9400 scores 2,144 against the Xeon L5420's 2,143 — a 0% lead for the Core 2 Duo SL9400. L3 cache: 6 MB L2 Cache on the Core 2 Duo SL9400 vs 12 MB L2 Cache on the Xeon L5420.

Feature	Core 2 Duo SL9400	Xeon L5420
Cores / Threads	2 / 2	4 / 4+100%
Boost Clock	1.86 GHz	2.5 GHz+34%
Base Clock	1.86 GHz	2.5 GHz+34%
L3 Cache	6 MB L2 Cache	12 MB L2 Cache+100%
L2 Cache	6 MB	6 MB (total)
Process	45 nm	45 nm
Architecture	Penryn (2008−2011)	Harpertown (2007−2008)
PassMark	2,144	2,143

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Memory & Platform

The Core 2 Duo SL9400 uses the BGA956 socket (PCIe 1.1), while the Xeon L5420 uses LGA771 (PCIe 2.0) — making them incompatible on the same motherboard.