How Gigabyte left if I install windows 7 64bit, latest photosoft, latest 3dmax, latest outocad, and latest Android studio on Samsung SSD 850 pro 128Gb. Thank you?
AutoCAD - version and addons unknown.
3dmax (3DSMax?) - version and addons unknown
"photosoft" - you mean photoshop?
All of those can be quite large. Doubtful you'll get all of them installed on that drive + Win 7.
A 128GB drive really only has ~85GB usable space.
Win 7 by itself, with the current updates, will consume maybe 45GB.
But if you have the budget for those large expensive applications, you also have the budget for a larger SSD.