Mobile Sempron SI-42 vs Atom N455

Performance Spectrum - CPU

Mobile Sempron SI-42

1 / 1

332

0.0%

Ryzen Threadripper PRO 3955WX

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Ryzen Threadripper 7970X

Atom N455

1 / 2

345

+3.9%

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.

Value Upgrade Path

This is the official ChipVERSUS Value Rating, comparing raw performance (PassMark) per dollar. Components placed above yours deliver better value for money. The Mobile Sempron SI-42 is positioned at rank 1175 and the Atom N455 is on rank 633, so the Atom N455 offers better cost-efficiency for playing games.

MSRP is the manufacturer's suggested retail price.•
Avg price is the current average price collected from markets across the web.

Performance Per Dollar Mobile Sempron SI-42

#1163

Atom x5-Z8300

MSRP: $20|Avg: N/A

4419%

#1164

Atom Z3735G

MSRP: $17|Avg: N/A

4354%

#1165

Core i5-480M

MSRP: $81|Avg: $77

3997%

#1166

Core i5-460M

MSRP: $80|Avg: $129

3979%

#1167

Core i5-2540M

MSRP: $266|Avg: $10

3942%

#1169

Core i5-450M

MSRP: $32|Avg: $31

3807%

#1170

Core i3-380M

MSRP: $49|Avg: $25

3651%

#1171

Core i5-430M

MSRP: N/A|Avg: $33

3645%

#1172

Core 2 Duo T6600

MSRP: N/A|Avg: $4

3547%

#1175

Mobile Sempron SI-42

MSRP: N/A|Avg: N/A

100%

#1176

Core i7-2637M

MSRP: $289|Avg: N/A

98%

#1177

Athlon PRO 3045B

MSRP: $426|Avg: $180

98%

#1178

Core 2 Duo SL9600

MSRP: $316|Avg: N/A

98%

#1179

Core 2 Duo T5600

MSRP: $241|Avg: N/A

97%

#1180

Pentium N3510

MSRP: $161|Avg: $161

97%

#1181

Core i7-7Y75

MSRP: $393|Avg: $285

97%

#1183

Core i7-4500U

MSRP: $398|Avg: N/A

94%

#1185

Athlon Neo X2 L325

MSRP: $100|Avg: $5

93%

#1186

Core i3-2370M

MSRP: $225|Avg: N/A

92%

#1187

Core i3-3217UE

MSRP: $225|Avg: $35

91%

#1188

Celeron T3000

MSRP: $150|Avg: $54

91%

#1189

Core m7-6Y75

MSRP: $393|Avg: $393

91%

#1190

Core M-5Y10

MSRP: $281|Avg: $20

88%

Based on actual market prices and performance synthetic scores.

Performance Per Dollar Atom N455

#187

Core Ultra 9 288V

MSRP: $600|Avg: $600

98%

#188

Core i7-10870H

MSRP: $417|Avg: N/A

98%

#621

Atom x5-Z8300

MSRP: $20|Avg: N/A

850%

#622

Atom Z3735G

MSRP: $17|Avg: N/A

838%

#623

Core i5-480M

MSRP: $81|Avg: $77

769%

#624

Core i5-460M

MSRP: $80|Avg: $129

766%

#625

Core i5-2540M

MSRP: $266|Avg: $10

759%

#627

Core i5-450M

MSRP: $32|Avg: $31

733%

#628

Core i3-380M

MSRP: $49|Avg: $25

703%

#629

Core i5-430M

MSRP: N/A|Avg: $33

701%

#630

Core 2 Duo T6600

MSRP: N/A|Avg: $4

683%

#633

Atom N455

MSRP: N/A|Avg: N/A

100%

#638

Celeron Dual-Core T1400

MSRP: $80|Avg: $10

99%

Based on actual market prices and performance synthetic scores.

Performance Comparison

About PassMark

🏆 Chipversus Verdict

🚀 Performance Leadership

Performance Trade-off: The Mobile Sempron SI-42 leads in gaming performance. However, the Atom N455 is the stronger candidate for professional workloads, offering 3.8% greater multi-core processing power.

Insight	Mobile Sempron SI-42	Atom N455
Gaming	✅ Superior gaming performance	❌ Lower gaming performance
Workstation	❌ Weaker in multi-core tasks	✅ Better multi-core power
Price	Equivalent pricing	Equivalent pricing
Longevity	🛑 Legacy (Sable (2008−2009) / 65 nm)	🛑 Legacy (Pinetrail (2009−2011) / 45 nm)

💎 Value Proposition

Insight	Mobile Sempron SI-42	Atom N455
Cost Efficiency	❌ Lower cost efficiency	❌ Lower cost efficiency
Upfront Cost	Equivalent pricing	Equivalent pricing

Performance Check

Paired with RTX 4090

To accurately isolate CPU performance, all benchmarks below use an NVIDIA RTX 4090 as the reference GPU. This eliminates GPU-side bottlenecks and highlights pure processing throughput differences between the CPUs.

Note: Real-world results may vary based on your actual GPU. CPU performance impact is more visible in processing-intensive titles and high-refresh-rate gaming scenarios.

Mobile Sempron SI-42 Benchmark Check

Atom N455 Benchmark Check

Technical Specifications

Side-by-side comparison of Mobile Sempron SI-42 and Atom N455

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.

Atom N455

The Atom N455 is manufactured by Intel. It was released in 1 June 2010 (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: 512K (per core). Built on 45 nm process technology. Socket: FCBGA559. Thermal design power (TDP): 6.5 Watt. Memory support: DDR3. Passmark benchmark score: 345 points. Launch price was $64.

⚡

Processing Power

The Mobile Sempron SI-42 packs 1 cores / 1 threads, matching the Atom N455's 1 cores. Boost clocks reach 2.1 GHz on the Mobile Sempron SI-42 versus 1.67 GHz on the Atom N455 — a 22.8% clock advantage for the Mobile Sempron SI-42. The Mobile Sempron SI-42 uses the Sable (2008−2009) architecture (65 nm), while the Atom N455 uses Pinetrail (2009−2011) (45 nm). In PassMark, the Mobile Sempron SI-42 scores 332 against the Atom N455's 345 — a 3.8% lead for the Atom N455.

Feature	Mobile Sempron SI-42	Atom N455
Cores / Threads	1 / 1	1 / 2
Boost Clock	2.1 GHz+26%	1.67 GHz
Base Clock	—	1.66 GHz
L3 Cache	—	0 kB
L2 Cache	512 kB	512K (per core)
Process	65 nm	45 nm-31%
Architecture	Sable (2008−2009)	Pinetrail (2009−2011)
PassMark	332	345+4%

🧠

Memory & Platform

The Mobile Sempron SI-42 uses the S1g2 socket (PCIe 2.0), while the Atom N455 uses FCBGA559 (PCIe 2.0) — making them incompatible on the same motherboard.