Atom N450 vs Mobile Sempron SI-40

Atom N450

1 Cores2 Thrd512 WWMax: 1.67 GHz2009

Mobile Sempron SI-40

1 Cores1 Thrd512 WWMax: 2 GHz2008

Performance Spectrum - CPU

Atom N450

1 / 2

325

+0.9%

322

0.0%

Ryzen Threadripper PRO 3955WX

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Ryzen Threadripper 7970X

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 Atom N450 is positioned at rank 660 and the Mobile Sempron SI-40 is on rank 1182, so the Atom N450 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 Atom N450

#648

Atom x5-Z8300

MSRP: $20|Avg: N/A

903%

#649

Atom Z3735G

MSRP: $17|Avg: N/A

890%

#650

Core i5-480M

MSRP: $81|Avg: $77

817%

#651

Core i5-460M

MSRP: $80|Avg: $129

813%

#652

Core i5-2540M

MSRP: $266|Avg: $10

805%

#654

Core i5-450M

MSRP: $32|Avg: $31

778%

#655

Core i3-380M

MSRP: $49|Avg: $25

746%

#656

Core i5-430M

MSRP: N/A|Avg: $33

745%

#657

Core 2 Duo T6600

MSRP: N/A|Avg: $4

725%

#660

Atom N450

MSRP: N/A|Avg: N/A

100%

#662

Athlon II P360

MSRP: $60|Avg: $10

100%

#665

Athlon X2 QL-64

MSRP: $50|Avg: $15

99%

#666

Core 3 N350

MSRP: $225|Avg: $220

99%

#668

FX-7500

MSRP: $100|Avg: $25

99%

Based on actual market prices and performance synthetic scores.

Performance Per Dollar Mobile Sempron SI-40

#1170

Atom x5-Z8300

MSRP: $20|Avg: N/A

4556%

#1171

Atom Z3735G

MSRP: $17|Avg: N/A

4489%

#1172

Core i5-480M

MSRP: $81|Avg: $77

4121%

#1173

Core i5-460M

MSRP: $80|Avg: $129

4102%

#1174

Core i5-2540M

MSRP: $266|Avg: $10

4065%

#1176

Core i5-450M

MSRP: $32|Avg: $31

3925%

#1177

Core i3-380M

MSRP: $49|Avg: $25

3764%

#1178

Core i5-430M

MSRP: N/A|Avg: $33

3758%

#1179

Core 2 Duo T6600

MSRP: N/A|Avg: $4

3657%

#1182

Mobile Sempron SI-40

MSRP: N/A|Avg: N/A

100%

#1183

Core i7-4500U

MSRP: $398|Avg: N/A

97%

#1185

Athlon Neo X2 L325

MSRP: $100|Avg: $5

95%

#1186

Core i3-2370M

MSRP: $225|Avg: N/A

95%

#1187

Core i3-3217UE

MSRP: $225|Avg: $35

94%

#1188

Celeron T3000

MSRP: $150|Avg: $54

94%

#1189

Core m7-6Y75

MSRP: $393|Avg: $393

93%

#1190

Core M-5Y10

MSRP: $281|Avg: $20

91%

#1193

Celeron 900

MSRP: $86|Avg: $5

88%

#1194

Pentium T3400

MSRP: $150|Avg: $90

87%

#1195

Core 2 Solo SU3500

MSRP: $262|Avg: $15

87%

#1196

Core 2 Duo E8335

MSRP: $200|Avg: $50

85%

Based on actual market prices and performance synthetic scores.

Performance Comparison

About PassMark

🏆 Chipversus Verdict

🚀 Performance Leadership

Performance Trade-off: The Mobile Sempron SI-40 leads in gaming performance. However, the Atom N450 is the stronger candidate for professional workloads, offering 0.9% greater multi-core processing power.

Insight	Atom N450	Mobile Sempron SI-40
Gaming	❌ Lower gaming performance	✅ Superior gaming performance
Workstation	✅ Better multi-core power	❌ Weaker in multi-core tasks
Price	Equivalent pricing	Equivalent pricing
Longevity	🛑 Legacy (Pinetrail (2009−2011) / 45 nm)	🛑 Legacy (Sable (2008−2009) / 65 nm)

💎 Value Proposition

Insight	Atom N450	Mobile Sempron SI-40
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.

Atom N450 Benchmark Check

Mobile Sempron SI-40 Benchmark Check

Technical Specifications

Side-by-side comparison of Atom N450 and Mobile Sempron SI-40

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.

⚡

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

🧠

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.