Core 2 Duo T5900 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 T5900 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 T5900 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 T5900

2008

Why buy it

✅Draws 2W instead of 50W, a 48W reduction.

Trade-offs

❌Lower PassMark (2,123 vs 2,143).
❌Less compelling for workstation-style loads than Xeon L5420, which brings 4 cores / 4 threads.

Xeon L5420

2008

Why buy it

✅Better for workstations and heavier parallel workloads: 4 cores / 4 threads.

Trade-offs

❌2400% higher power demand at 50W vs 2W.

Quick Answers

So, is Xeon L5420 better than Core 2 Duo T5900?

Not really, because they are built for different jobs. Xeon L5420 makes more sense for workstation-style multi-core throughput, while Core 2 Duo T5900 is the more practical desktop choice for gaming, platform cost, and everyday use.

Which one is better for gaming?

If gaming is the priority, Xeon L5420 is the better pick. According to our tests, it delivers 2.2% 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, Xeon L5420 is the stronger fit. You are getting 0.9% better PassMark, backed by 4 cores and 4 threads.

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

Xeon L5420 still makes the most sense overall. Xeon L5420 comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you a 2.2% average FPS lead across 49 shared CPU game tests in our data.

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

Xeon L5420 makes more sense long term for 2026 and beyond. You are getting more multi-core headroom with 4 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 T5900 vs Xeon L5420 Technical Specifications

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

Core 2 Duo T5900

The Core 2 Duo T5900 is manufactured by Intel. It was released in 2008-01-01. It is based on the Merom (2006−2008) architecture. It features 2 cores and 2 threads. Max frequency: 2.2 GHz. L2 cache: 2 MB. Built on 65 nm process technology. Socket: P. Thermal design power (TDP): 2 MB. Passmark benchmark score: 2,123 points. Launch price was $249.

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 T5900 packs 2 cores / 2 threads, while the Xeon L5420 offers 4 cores / 4 threads — the Xeon L5420 has 2 more cores. Boost clocks reach 2.2 GHz on the Core 2 Duo T5900 versus 2.5 GHz on the Xeon L5420 — a 12.8% clock advantage for the Xeon L5420. The Core 2 Duo T5900 uses the Merom (2006−2008) architecture (65 nm), while the Xeon L5420 uses Harpertown (2007−2008) (45 nm). In PassMark, the Core 2 Duo T5900 scores 2,123 against the Xeon L5420's 2,143 — a 0.9% lead for the Xeon L5420.

Feature	Core 2 Duo T5900	Xeon L5420
Cores / Threads	2 / 2	4 / 4+100%
Boost Clock	2.2 GHz	2.5 GHz+14%
Base Clock	—	2.5 GHz
L3 Cache	—	12 MB L2 Cache
L2 Cache	2 MB	6 MB (total)+200%
Process	65 nm	45 nm-31%
Architecture	Merom (2006−2008)	Harpertown (2007−2008)
PassMark	2,123	2,143

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Memory & Platform

The Core 2 Duo T5900 uses the P socket (PCIe 1.1), while the Xeon L5420 uses LGA771 (PCIe 2.0) — making them incompatible on the same motherboard.