ATA & USB Standard

Hard disk Bus Speed Thoughput Cable Len     Bus Speed Thoughput Cable Len
PATA133 1.0Gb/s 133MB/s 48cm   USB 1.0 1.5Mb/s 180KB/s 5m
SATA 1.5Gb/s 150MB/s 1m   USB 1.1 12Mb/s 1.5MB/s 5m
SATA-2 3.0Gb/s 300MB/s 1m   USB 2.0 480Mb/s 60MB/s 5m
SATA-3 6.0Gb/s 600MB/s 1m   USB 3.0 5Gb/s 500MB/s 5m
eSATA 3.0Gb/s 300MB/s 2m   1394 400Mb/s 49.15MB/s 4.5m

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RAM standard

Standard name Memory clock (MHz) I/O bus clock (MHz) Data rate (MT/s) Module name
DDR3-800 100 400 800 PC3-6400
DDR3-1066 133⅓ 533⅓ 1066⅔ PC3-8500
DDR3-1333 166⅔ 666⅔ 1333⅓ PC3-10600
DDR3-1600 200 800 1600 PC3-12800
DDR3-1866 233⅓ 933⅓ 1866⅔ PC3-14900
DDR3-2133 266⅔ 1066⅔ 2133⅓ PC3-17000
DDR2-400 100 200 400 PC2-3200
DDR2-533 133⅓ 266⅔ 533⅓ PC2-4200
DDR2-667 166⅔ 333⅓ 666⅔ PC2-5300
DDR2-800 200 400 800 PC2-6400
DDR2-1066 266⅔ 533⅓ 1066⅔ PC2-8500
DDR-200 100 100 200 PC-1600
DDR-266 133 133 266 PC-2100
DDR-333 166 166 333 PC-2700
DDR-400 200 200 400 PC-3200


Memory Pins Type Memory Technology   Memory Pins Type Memory Technology
144-pin SO-DIMM SDR SDRAM   168-pin DIMM SDR SDRAM (server 3.3/5V)
200-pin SO-DIMM DDR/DDR2 DRAM   184-pin DIMM DDR RAM
204-pin SO-DIMM DDR3 DRAM   240-pin DIMM DDR2/3 RAM
260-pin SO-DIMM DDR4 DRAM   288-pin DIMM DDR4 RAM

Power Supply Standard

Loading 20% Load 50% Load 100% Load   @115V AC 20% Load 50% Load 100% Load
80 Plus Standard 80% 80% 80%   80 Plus Silver 85% 88% 85%
80 Plus Bronze 82% 85% 82%   80 Plus Gold 87% 90% 87%
80 Plus Platinum 90% 92% 89%



http://www.ktgee.net/post/55503462757/used-hp-elitebook-buyers-guide
http://www.pcworld.idg.com.au/article/382500/lenovo_laptop_buying_guide
Used HP EliteBook Buyers Guide

http://www.ktgee.net/post/49423737148/thinkpad-guide
Used ThinkPad Buyers Guide

http://www.thinkwiki.org/wiki/ThinkPad_X200_UltraBase
http://www.thinkwiki.org/wiki/Category:X201s
http://www.thinkwiki.org/wiki/Category:X200
Very good spec. site

http://www.ktgee.net/post/49736465981/dell-guide
Used Dell Buyers Guide

http://software.informer.com
Software

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