Phenom II X3 N870 vs Xeon L5420

Phenom II X3 N870 vs Xeon L5420 Performance Spectrum

Phenom II X3 N870

3 / 3

2,145

+0.1%

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Xeon L5420

4 / 4

2,143

0.0%

About PassMark

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.

Phenom II X3 N870 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.

Phenom II X3 N870 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.

Phenom II X3 N870

2010

Why buy it

✅+0.1% higher PassMark.
✅Draws 2W instead of 50W, a 49W reduction.

Trade-offs

❌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

❌Lower PassMark (2,143 vs 2,145).
❌3233.3% higher power demand at 50W vs 1.5W.

Quick Answers

So, is Phenom II X3 N870 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 Phenom II X3 N870 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, Phenom II X3 N870 is the stronger fit. You are getting 0.1% better PassMark, backed by 3 cores and 3 threads.

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

Phenom II X3 N870 still makes the most sense overall. Phenom II X3 N870 comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you 0.1% better PassMark.

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

Phenom II X3 N870 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2010 vs 2008) and more multi-core headroom with 3 cores / 3 threads instead of 4/4. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Phenom II X3 N870 vs Xeon L5420 Technical Specifications

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

Phenom II X3 N870

The Phenom II X3 N870 is manufactured by AMD. It was released in 2009-01-01. It is based on the Champlain (2010−2011) architecture. It features 3 cores and 3 threads. Max frequency: 2.3 GHz. L2 cache: 1.5 MB. Built on 45 nm process technology. Socket: S1g4. Thermal design power (TDP): 1.5 MB. Memory support: DDR3. Passmark benchmark score: 2,145 points. Launch price was $149.

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 Phenom II X3 N870 packs 3 cores / 3 threads, while the Xeon L5420 offers 4 cores / 4 threads — the Xeon L5420 has 1 more core. Boost clocks reach 2.3 GHz on the Phenom II X3 N870 versus 2.5 GHz on the Xeon L5420 — a 8.3% clock advantage for the Xeon L5420. The Phenom II X3 N870 uses the Champlain (2010−2011) architecture (45 nm), while the Xeon L5420 uses Harpertown (2007−2008) (45 nm). In PassMark, the Phenom II X3 N870 scores 2,145 against the Xeon L5420's 2,143 — a 0.1% lead for the Phenom II X3 N870.

Feature	Phenom II X3 N870	Xeon L5420
Cores / Threads	3 / 3	4 / 4+33%
Boost Clock	2.3 GHz	2.5 GHz+9%
Base Clock	—	2.5 GHz
L3 Cache	—	12 MB L2 Cache
L2 Cache	1.5 MB	6 MB (total)+300%
Process	45 nm	45 nm
Architecture	Champlain (2010−2011)	Harpertown (2007−2008)
PassMark	2,145	2,143

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Memory & Platform

The Phenom II X3 N870 uses the S1g4 socket (PCIe 2.0), while the Xeon L5420 uses LGA771 (PCIe 2.0) — making them incompatible on the same motherboard.