Difference is in the thickness.
one is 7 mm and the other is 9.5 mm
Only make a diff if installing in a laptop, may not be interchanable.
No performance difference.
Benchmarks normally quoted are for Sequencial performance and use data that is HIGHLY compressable. (A) - Sequencial performance, Least important parameter for an OS + Program drive. B) Use of highly compressable data is not realistic as the majority of the files on an OS + program drive do NOT tend to be Highly compressable, some compression yes.
An this is the reason that in day-to-day usage not a nickels woth of difference in many cases.
Have 2 x 128 gig M4's, 2 120 gig Agility III ( a Sata II SSD with a Sata III wrapper), a 128 gig 830 Plus about 5 older generation SSDs.