Which one is fastest? and which one is slowest? (seeking time)

a) AMD Athlon XP 1700+, 40GB HDD(7200rpm), 256MB DDR 266Mhz

b) AMD Athlon XP 1700+, 40GB HDD(7200rpm), 512MB DDR 266Mhz

c) AMD Athlon XP 2000+, 80GB HDD(7200rpm), 256MB DDR 333MHZ

d) AMD Athlon XP 2000+, 80GB HDD(7200rpm), 256MB DDR 333MHZ

e) AMD Athlon XP 2400+, 120GB HDD(7200rpm), 256MB DDR 333MHZ

f) AMD Athlon XP 2400+, 120GB HDD(7200rpm), 256MB DDR 333MHZ

Assume that all the brands, OS, and applications is the same...

[flip]Tell me why...?[/flip]