Atom N450 vs Mobile Sempron SI-40

Atom N450 vs Mobile Sempron SI-40 Performance Spectrum

Atom N450

1 / 2

325

+0.9%

322

0.0%

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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.

Atom N450 vs Mobile Sempron SI-40 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.

Atom N450 vs Mobile Sempron SI-40: Pros, Cons & Final Verdict

See where each CPU makes more sense in practice: gaming, heavier work, platform cost, power draw, and upgrade path.

Atom N450

2009

Why buy it

✅+0.9% higher PassMark.
✅Integrated graphics onboard with Intel GMA 3150, while Mobile Sempron SI-40 needs a discrete GPU.

Trade-offs

❌Fewer obvious downsides in this matchup outside of normal market pricing swings.

Mobile Sempron SI-40

2008

Why buy it

Trade-offs

❌Lower PassMark (322 vs 325).
❌No integrated graphics, while Atom N450 can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Atom N450 better than Mobile Sempron SI-40?

It depends on what you want from the system. For gaming, Mobile Sempron SI-40 is ahead with 19.8% higher max boost clock. For rendering, compiling, streaming, and heavier multitasking, Atom N450 pulls ahead with 0.9% better PassMark.

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

For streaming, content creation, and heavier multitasking, Atom N450 is the stronger fit. You are getting 0.9% better PassMark, backed by 1 cores and 2 threads.

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

Atom N450 still makes the most sense overall. Atom N450 comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you 0.9% better PassMark.

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

Atom N450 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2009 vs 2008) and more multi-core headroom with 1 cores / 2 threads instead of 1/1. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Atom N450 vs Mobile Sempron SI-40 Technical Specifications

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

Atom N450

The Atom N450 is manufactured by Intel. It was released in 21 December 2009 (15 years ago). It is based on the Pinetrail (2009−2011) architecture. It features 1 cores and 2 threads. Base frequency is 1.66 GHz, with boost up to 1.67 GHz. L3 cache: 0 kB. L2 cache: 512 kB (per core). Built on 45 nm process technology. Socket: FCBGA559. Thermal design power (TDP): 5.5 Watt. Memory support: DDR2. Passmark benchmark score: 325 points. Launch price was $64.

Mobile Sempron SI-40

The Mobile Sempron SI-40 is manufactured by AMD. It was released in 4 July 2008 (17 years ago). It is based on the Sable (2008−2009) architecture. It features 1 cores and 1 threads. Max frequency: 2 GHz. L2 cache: 512 kB. Built on 65 nm process technology. Socket: S1g2. Thermal design power (TDP): 512 kB. Passmark benchmark score: 322 points. Launch price was $69.

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Processing Power

The Atom N450 packs 1 cores / 2 threads, matching the Mobile Sempron SI-40's 1 cores. Boost clocks reach 1.67 GHz on the Atom N450 versus 2 GHz on the Mobile Sempron SI-40 — a 18% clock advantage for the Mobile Sempron SI-40. The Atom N450 uses the Pinetrail (2009−2011) architecture (45 nm), while the Mobile Sempron SI-40 uses Sable (2008−2009) (65 nm). In PassMark, the Atom N450 scores 325 against the Mobile Sempron SI-40's 322 — a 0.9% lead for the Atom N450.

Feature	Atom N450	Mobile Sempron SI-40
Cores / Threads	1 / 2	1 / 1
Boost Clock	1.67 GHz	2 GHz+20%
Base Clock	1.66 GHz	—
L3 Cache	0 kB	—
L2 Cache	512 kB (per core)	512 kB
Process	45 nm-31%	65 nm
Architecture	Pinetrail (2009−2011)	Sable (2008−2009)
PassMark	325	322

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Memory & Platform

The Atom N450 uses the FCBGA559 socket (PCIe 2.0), while the Mobile Sempron SI-40 uses S1g2 (PCIe 2.0) — making them incompatible on the same motherboard.