Intel Xeon 2.66 vs Intel Pentium III 1266S

Comparative analysis of Intel Xeon 2.66 and Intel Pentium III 1266S processors for all known characteristics in the following categories: Essentials, Performance, Compatibility, Advanced Technologies, Virtualization. Benchmark processor performance analysis: PassMark - Single thread mark, PassMark - CPU mark.

Intel Xeon 2.66

Intel Pentium III 1266S

Differences

Reasons to consider the Intel Xeon 2.66

Around 109% higher clock speed: 2.66 GHz vs 1.27 GHz
2x more L1 cache, more data can be stored in the L1 cache for quick access later
Around 41% better performance in PassMark - CPU mark: 435 vs 309

Specifications (specs)
Maximum frequency	2.66 GHz vs 1.27 GHz
L1 cache	16 KB vs 8 KB
Max number of CPUs in a configuration	2 vs 1
Benchmarks
PassMark - CPU mark	435 vs 309

Reasons to consider the Intel Pentium III 1266S

3x lower typical power consumption: 30.4 Watt vs 89 Watt

Thermal Design Power (TDP)	30.4 Watt vs 89 Watt

Compare benchmarks

CPU 1: Intel Xeon 2.66
CPU 2: Intel Pentium III 1266S

PassMark - CPU mark

CPU 1

CPU 2

435

309

Name	Intel Xeon 2.66	Intel Pentium III 1266S
PassMark - Single thread mark	0	0
PassMark - CPU mark	435	309

Compare specifications (specs)

	Intel Xeon 2.66	Intel Pentium III 1266S
Essentials
Architecture codename	Prestonia	Tualatin
Launch date	November 2002	Q4'01
Place in performance rating	3349	3355
Vertical segment	Server	Server
Series		Legacy Intel® Pentium® Processor
Status		Discontinued
Performance
Die size	217 mm	80 mm
L1 cache	16 KB	8 KB
L2 cache	512 KB	512 KB
Manufacturing process technology	130 nm	130 nm
Maximum frequency	2.66 GHz	1.27 GHz
Number of cores	1	1
Transistor count	55 million	44 million
64 bit support
Base frequency		1.26 GHz
Bus Speed		133 MHz FSB
Maximum case temperature (TCase)		69 °C
Maximum core temperature		69°C
VID voltage range		1.5V
Compatibility
Max number of CPUs in a configuration	2	1
Sockets supported	604	PPGA370
Thermal Design Power (TDP)	89 Watt	30.4 Watt
Low Halogen Options Available
Advanced Technologies
Intel® Turbo Boost technology
Virtualization
Intel® Virtualization Technology (VT-x)