I have an Intel Core i5 750 and an ASUS Maximus III Formula. I have overclocked it to 3.4GHz (21 x 162).
In CPU-Z and in the BIOS it says my CPU multiplier was 21. Hence 3.4ghz. BUT, under system properties in windows 7 it says 3.25ghz (20 x 162). I am a little confused as to why I could even set a multiplier of 21, I always thought the 750 had a max multiplier of 20, not 21. Just for the record, Both Turbo Boost and SpeedStep are disabled.
Should I just set the multiplier to 20 and the BCLK to 170? But I still want to know why the multiplier is "different".