O/C CPU but getting capped

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http://forum.xda-developers.com – I used SetCPU pretty much everything works, changing govenor, I/O scheduler. However for max frequency it would not go past 1.6GHz, if I put number smaller than 1.6, it would properly kept it at that number, but anything I put that's over 1.6 it would be capped at 1.6GHz.. Not sure what the reason is, could it be not enough voltage? ( I did not mess with the voltage at all) Phone spec: Xperia Pro MK16a rooted, bootloader unlocked This Kernel >> http://forum.xda-developers.com/show....php?t=1885068 This Rom >> http://forum.xda-developers.com/show....php?t=1888518 (HowTos)