Energy saving CPU

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I have a few old computers. I want to use one as a server and keep it running all day. Which of them old Central Processor Units (CPU) is the most energy efficient? Listed is the Typical and Maximum Power Dissipation, retrieved from Old Processor Electrical Specifications.

These are my options:

Measured power dissipation of total computer CPU Typical Power Dissipation CPU Maximum Power Dissipation Description
? ? W 14.5 W Pentium III 550E MHz, Slot 1 (Coppermine - 550/256/100/1.65V S1 10070273-0243 Phillippines 99 SL3N7)
30.3 W ? W 25.3 W Pentium III 450 MHz (Katmai - 450/512/100/2.0V S1 097370020-0081 COSTA RICA 98 SL35D), Motherboard Compaq 118053-001
? W ? W 30.8 W Pentium III (Katmai - 550/512/100/2.0V S1 00050500-0456 COSTA RICA '98 SL3F7), Motherboard ASUS P3B-F
28.2 W 31.4 W AMD Duron 700 MHz
? 38.2 W Pentium II 266 MHz (Klamath - 80522PX266512EC SL2HE 18050361-479 Phillipines), ASUS P2L97 with Pentium II processor
41 W 46 W AMD K7 550 MHz processor socket A (462) Micro-Star MS-6167
43 W 48 W AMD Athlon 800 MHz socket A (462) MS-6340 Micro-ATX
58.9 W 66 W AMD-2000+ processor, socket A (462) ASUS A7N8X-X
59.8W Intel Celeron 2.4 GHz, Motherboard AOpen AX4GER

See also
"Most eco friendly energy efficient Desktop Computers Power usage data"
Wikipedia article explaing "Power dissipation". Contains processor list as well
Slashdot | The Power Consumption of Modern PCs
Slashdot article - always interesting comments
Standby: S1, S3 and S4
Explanation of different stand-by modes
Energy monitor
More apparatus measured



Processor Electrical Specifications


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