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.

Overview

The Pentium III 1266S is manufactured by Intel. It was released in 2007-01-01. It is based on the Tualatin (2000−2002) architecture. It features 1 cores and 1 threads. Max frequency: 1.27 GHz. L3 cache: 0 kB. L2 cache: 512 kB. Built on 130 nm process technology. Socket: PGA370. Thermal design power (TDP): 30 Watt. Passmark benchmark score: 210 points. Launch price was $69.

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.

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

Performance Per Dollar Pentium III 1266S

#960

Phenom II X3 710

MSRP: $125|Avg: N/A

122%

#961

Athlon XP 1500+

MSRP: $130|Avg: $15

119%

#962

Core i3-2100T

MSRP: $127|Avg: $127

115%

#963

Athlon XP 1900+

MSRP: $269|Avg: $20

113%

#964

Core 2 Duo E7300

MSRP: $133|Avg: $133

111%

#965

Pentium Extreme Edition 965

MSRP: $999|Avg: $100

111%

#966

Phenom II X4 810

MSRP: $175|Avg: N/A

111%

#967

Athlon 64 X2 4200+

MSRP: $581|Avg: $110

109%

#968

Pentium III 1400

MSRP: $250|Avg: $20

109%

#969

Celeron E1400

MSRP: $53|Avg: $63

108%

#970

Athlon X2 BE-2300

MSRP: $100|Avg: $80

108%

#971

Athlon XP 3200+

MSRP: $464|Avg: $40

106%

#972

Sempron 2800+

MSRP: $65|Avg: $29

105%

#973

A8-3820

MSRP: $280|Avg: $200

104%

#974

Athlon XP 2800+

MSRP: $375|Avg: $35

103%

#975

Pentium III 1266S

MSRP: $369|Avg: $20

100%

#976

Athlon XP 2200+

MSRP: $241|Avg: $30

89%

#977

Athlon II X4 635

MSRP: $400|Avg: $250

86%

#978

Athlon XP 2100+

MSRP: $420|Avg: $30

84%

#979

Pentium G4400TE

MSRP: $300|Avg: $250

83%

#980

Celeron 2.70

MSRP: $49|Avg: $49

79%

#981

Phenom X3 8450

MSRP: $145|Avg: $147

79%

#982

Athlon II X4 638

MSRP: $300|Avg: $280

77%

#983

Ryzen Embedded R2314

MSRP: $300|Avg: $762

73%

#984

Core 2 Duo E7200

MSRP: $133|Avg: $133

72%

#985

Athlon XP 1800+

MSRP: $252|Avg: $30

71%

#986

Celeron E1200

MSRP: $53|Avg: $98

65%

#987

Athlon XP 2000+

MSRP: $339|Avg: $40

60%

#988

Pentium III 1133

MSRP: $990|Avg: $30

57%

#989

Celeron 2.10

MSRP: $49|Avg: $49

55%

#990

Pentium 4 1.80

MSRP: $562|Avg: $40

54%

Based on actual market prices and performance synthetic scores.

FPS Benchmarks

Predicted performance for Pentium III 1266S across popular games. Tested paired with RTX 4090 to isolate CPU performance.

Technical Analysis

Detailed breakdown of Pentium III 1266S specifications and capabilities.

⚡

Processing Power

The Pentium III 1266S is a 1-core / 1-thread processor based on the Tualatin (2000−2002) architecture, manufactured on a 130 nm process node. It reaches a maximum boost clock of 1.27 GHz— higher boost clocks directly translate to better single-threaded performance and responsiveness in gaming. It carries 0 kB of L3 cache, plus 512 kB of L2 cache and 8 kB of L1 cache per core. In the PassMark benchmark (a comprehensive multi-threaded test), it scores 210, placing it in the Entry Level performance tier as a Legacy generation product.

Specification	Pentium III 1266S
Cores / ThreadsPhysical/logical processing units	1C / 1T
Max Boost ClockPeak single-core speed under boost	1.27 GHz
ArchitectureCPU microarchitecture design	Tualatin (2000−2002)
Process NodeFabrication technology — smaller = more efficient	130 nm
L3 CacheShared cache — reduces memory latency for all cores	0 kB
L2 CachePer-core fast cache for frequently accessed data	512 kB
L1 CacheUltra-fast per-core cache	8 kB
Die SizePhysical silicon area of the processor	80 mm2
Transistor CountMore transistors = more capabilities	44 million
64-bit Support	No
Windows 11 Compatible	No
PassMark ScoreOverall multi-threaded benchmark score	210

🧠

Memory & Platform

The Pentium III 1266S fits into the PGA370 socket and supports PCIe 1.1.

Specification	Pentium III 1266S
TypeDesktop or Laptop processor	desktop
SocketMotherboard socket required	PGA370
PCIe GenerationPeripheral interconnect speed — affects GPU and SSD bandwidth	PCIe 1.1
Max CPUs in ConfigMulti-socket support for servers	1

🌡️

Power & Cooling

The Pentium III 1266S has a rated TDP (Thermal Design Power) of 30 Watt — this indicates the amount of heat generated under sustained load and determines what cooling solution is needed.

Specification	Pentium III 1266S
TDPThermal Design Power — heat output under sustained workload	30 Watt

💰

Value Analysis

At an average price of $20 (MSRP: $369), the Pentium III 1266S delivers 11 PassMark points per dollar. Performance ranking position: #3529 out of all indexed processors.

Specification	Pentium III 1266S
MSRPManufacturer's Suggested Retail Price	$369
Avg Price (30d)Average market price over the last 30 days	$20
Launch PriceOriginal retail price at launch	$69
Performance RankPosition in overall performance ranking	#3529
Release DateLaunch date	2007-01-01
Release Year	2001
DesignerArchitecture designer (e.g. Intel, AMD)	Intel

Specifications Reference

Raw spec sheet for quick lookup. The analysis cards above explain what these fields mean in practice.

3 categories

General Information

6 specs

Type	desktop
Designer	Intel
Launch Price	$69
Release Date	2007-01-01
Architecture Codename	Tualatin (2000−2002)
Performance Ranking Position	3529

Technical Specifications

12 specs

Cores	1
Threads	1
Die Size	80 mm2
L1 Cache	8 kB
L2 Cache	512 kB
L3 Cache	0 kB
Max Frequency	1.27 GHz
64-Bit Support	-
Transistor Count	44 million
Process Technology	130 nm
Windows 11 Compatible	-
Max Case Temperature (TCase)	69 °C