RAM

I have DRAM Frequency 1600 MHz in my PC but Speccy has been showing the DRAM Frequency as 1333 MHz.

I have just updated Speccy and now its showing DRAM Frequency 800.5 MHz ???

You probably have 1600 (MT/s) which is = 800MHz.

Which Speccy version are you using?

You could check/confirm your RAM speed from BIOS.