Mobile Sempron SI-42 vs Pentium 4 2.40

Mobile Sempron SI-42 vs Pentium 4 2.40 Performance Spectrum

Mobile Sempron SI-42

1 / 1

332

+2.2%

Ryzen Threadripper PRO 3955WX

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Ryzen Threadripper 7970X

Pentium 4 2.40

1 / 1

325

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.

Mobile Sempron SI-42 vs Pentium 4 2.40 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.

Mobile Sempron SI-42 vs Pentium 4 2.40: Pros, Cons & Final Verdict

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

Mobile Sempron SI-42

2009

Why buy it

✅+2.2% higher PassMark.

Trade-offs

❌365.5% higher power demand at 512W vs 110W.

Pentium 4 2.40

2004

Why buy it

✅Draws 110W instead of 512W, a 402W reduction.

Trade-offs

❌Lower PassMark (325 vs 332).
❌Launch MSRP is still $193 MSRP, while Mobile Sempron SI-42 mostly shows up through inconsistent older-market listings.

Quick Answers

So, is Pentium 4 2.40 better than Mobile Sempron SI-42?

It depends on what you want from the system. For gaming, Pentium 4 2.40 is ahead with 14.3% higher max boost clock. For rendering, compiling, streaming, and heavier multitasking, Mobile Sempron SI-42 pulls ahead with 2.2% better PassMark.

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

For streaming, content creation, and heavier multitasking, Mobile Sempron SI-42 is the stronger fit. You are getting 2.2% better PassMark, backed by 1 cores and 1 threads.

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

Pentium 4 2.40 is the better buy right now. Pentium 4 2.40 comes in at an unclear MSRP at $193 MSRP versus unclear MSRP, and it still gives you 14.3% higher max boost clock. The compromise is that Mobile Sempron SI-42 is still stronger for heavier multi-core work with 2.2% better PassMark. It is also 100.0% better value on MSRP (1.7 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Mobile Sempron SI-42 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2009 vs 2004) and more multi-core headroom with 1 cores / 1 threads instead of 1/1. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Mobile Sempron SI-42 vs Pentium 4 2.40 Technical Specifications

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

Mobile Sempron SI-42

The Mobile Sempron SI-42 is manufactured by AMD. It was released in 1 September 2009 (16 years ago). It is based on the Sable (2008−2009) architecture. It features 1 cores and 1 threads. Max frequency: 2.1 GHz. L2 cache: 512 kB. Built on 65 nm process technology. Socket: S1g2. Thermal design power (TDP): 512 kB. Passmark benchmark score: 332 points. Launch price was $69.

Pentium 4 2.40

The Pentium 4 2.40 is manufactured by Intel. It was released in 2007-01-01. It is based on the NetBurst (2000−2006) architecture. It features 1 cores and 1 threads. Max frequency: 2.4 GHz. L3 cache: 0 kB. L2 cache: 1 MB. Built on 90 nm process technology. Socket: PGA478. Thermal design power (TDP): 110 Watt. Memory support: DDR1, DDR2. Passmark benchmark score: 325 points. Launch price was $69.

⚡

Processing Power

Both the Mobile Sempron SI-42 and Pentium 4 2.40 share an identical 1-core/1-thread configuration. Boost clocks reach 2.1 GHz on the Mobile Sempron SI-42 versus 2.4 GHz on the Pentium 4 2.40 — a 13.3% clock advantage for the Pentium 4 2.40. The Mobile Sempron SI-42 uses the Sable (2008−2009) architecture (65 nm), while the Pentium 4 2.40 uses NetBurst (2000−2006) (90 nm). In PassMark, the Mobile Sempron SI-42 scores 332 against the Pentium 4 2.40's 325 — a 2.1% lead for the Mobile Sempron SI-42.

Feature	Mobile Sempron SI-42	Pentium 4 2.40
Cores / Threads	1 / 1	1 / 1
Boost Clock	2.1 GHz	2.4 GHz+14%
L3 Cache	—	0 kB
L2 Cache	512 kB	1 MB+100%
Process	65 nm-28%	90 nm
Architecture	Sable (2008−2009)	NetBurst (2000−2006)
PassMark	332+2%	325

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Memory & Platform

The Mobile Sempron SI-42 uses the S1g2 socket (PCIe 2.0), while the Pentium 4 2.40 uses PGA478 (PCIe 1.1) — making them incompatible on the same motherboard.