Mobile Sempron SI-40 vs Atom Z540

Performance Spectrum - CPU

Mobile Sempron SI-40

1 / 1

322

+5.6%

Ryzen Threadripper PRO 3955WX

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Ryzen Threadripper 7970X

Atom Z540

1 / 2

305

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.

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-40 is positioned at rank 1182 and the Atom Z540 is on rank 334, so the Atom Z540 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-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 Per Dollar Atom Z540

#322

Atom x5-Z8300

MSRP: $20|Avg: N/A

481%

#323

Atom Z3735G

MSRP: $17|Avg: N/A

474%

#324

Core i5-480M

MSRP: $81|Avg: $77

435%

#325

Core i5-460M

MSRP: $80|Avg: $129

433%

#326

Core i5-2540M

MSRP: $266|Avg: $10

429%

#328

Core i5-450M

MSRP: $32|Avg: $31

414%

#329

Core i3-380M

MSRP: $49|Avg: $25

397%

#330

Core i5-430M

MSRP: N/A|Avg: $33

397%

#331

Core 2 Duo T6600

MSRP: N/A|Avg: $4

386%

#334

Atom Z540

MSRP: N/A|Avg: N/A

100%

#336

Xeon E3-1505M v5

MSRP: $115|Avg: $115

100%

Based on actual market prices and performance synthetic scores.

Performance Comparison

About PassMark

🏆 Chipversus Verdict

🚀 Performance Leadership

Performance Leadership: The Mobile Sempron SI-40 delivers superior performance across the board. It outperforms the Atom Z540 in both compute-intensive tasks (5.4% faster) and gaming workloads.

Insight	Mobile Sempron SI-40	Atom Z540
Gaming	✅ Superior gaming performance	❌ Lower gaming performance
Workstation	✅ Better multi-core power	❌ Weaker in multi-core tasks
Price	Equivalent pricing	Equivalent pricing
Longevity	🛑 Legacy (Sable (2008−2009) / 65 nm)	🛑 Legacy (Silverthorne (2008−2010) / 45 nm)

💎 Value Proposition

Insight	Mobile Sempron SI-40	Atom Z540
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-40 Benchmark Check

Atom Z540 Benchmark Check

Technical Specifications

Side-by-side comparison of Mobile Sempron SI-40 and Atom Z540

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.

Atom Z540

The Atom Z540 is manufactured by Intel. It was released in 2 April 2008 (17 years ago). It is based on the Silverthorne (2008−2010) architecture. It features 1 cores and 2 threads. Base frequency is 1.86 GHz, with boost up to 0.07 GHz. L3 cache: 0 kB. L2 cache: 512 kB. Built on 45 nm process technology. Socket: PBGA441. Thermal design power (TDP): 2.4 Watt. Passmark benchmark score: 305 points. Launch price was $160.

⚡

Processing Power

The Mobile Sempron SI-40 packs 1 cores / 1 threads, matching the Atom Z540's 1 cores. Boost clocks reach 2 GHz on the Mobile Sempron SI-40 versus 0.07 GHz on the Atom Z540 — a 186.5% clock advantage for the Mobile Sempron SI-40. The Mobile Sempron SI-40 uses the Sable (2008−2009) architecture (65 nm), while the Atom Z540 uses Silverthorne (2008−2010) (45 nm). In PassMark, the Mobile Sempron SI-40 scores 322 against the Atom Z540's 305 — a 5.4% lead for the Mobile Sempron SI-40.

Feature	Mobile Sempron SI-40	Atom Z540
Cores / Threads	1 / 1	1 / 2
Boost Clock	2 GHz+2757%	0.07 GHz
Base Clock	—	1.86 GHz
L3 Cache	—	0 kB
L2 Cache	512 kB	512 kB
Process	65 nm	45 nm-31%
Architecture	Sable (2008−2009)	Silverthorne (2008−2010)
PassMark	322+6%	305

🧠

Memory & Platform

The Mobile Sempron SI-40 uses the S1g2 socket (PCIe 2.0), while the Atom Z540 uses PBGA441 (PCIe 2.0) — making them incompatible on the same motherboard.