The ThinkPad T431s supports a 1,600MHz processor memory clock speed which is faster than most medium processor core notebook PCs that were released more than two years ago. Most portable PCs that are a comparable age to it support a 133MHz processor memory clock speed. In addition, this portable PC supports 1 and 333MHz processor memory clock speeds.
A 1,600MHz processor memory clock speed is actually the best supported memory clock speeds supported by processor amongst all comparable spec laptops that were launched around the same time as the ThinkPad T431s.
Amongst similar types of notebook PC the worst supported memory clock speeds supported by processor is 133MHz.