Slow speed - Mid 2012 MBP 15" with Samsung 840 OptiBay


hi all,

own mid 2012 15" mbp , running samsung 840 250gb ssd (not evo or pro version) on main bay.

then, decided upgrade 850 pro 256gb , use 840 in optical bay (via ifixit dual drive enclosure).
installed trimenabler , got both drives trim enabled.

however, when ran blackmagic test, following result obtained 840 (the 850 pro performs superbly avg. 520 mb read/write):
write: 50 mb/s
read: 130 mb/s

have formatted 840 ssd mac journaled 1 partition.

may know how 840 work properly.

*sorry not including screenshot posting computer.
 



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