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They are almost the same in the 960 Pro but like most SSDs, the smaller storage sizes are less performant: link

  •  RANDOM WRITE (4KB, QD32) 
    512 GB: Up to 330,000 IOPS (Thread 4)
    1024 GB: Up to 360,000 IOPS (Thread 4)
    2048 GB: Up to 360,000 IOPS (Thread 4)
  •  RANDOM READ (4KB, QD32) 
    512 GB: Up to 330,000 IOPS (Thread 4)
    1024 GB: Up to 440,000 IOPS (Thread 4)
    2048 GB: Up to 440,000 IOPS (Thread 4)



You mean 10% overprovisioning (unformatted, outside of a volume), because S.M.A.R.T. and "cache" are two completely different and unrelated functions. Almost all modern SSDs have a good garbage collection system in place along with unassignable storage for overprovisioning. As long as an SSD doesn't get filled much over 90%, you're not going to be able to notice it.