That doesn't make sense and it sounds like he doesn't know what he's talking about. Cpu speed = bclk x multiplier. Bclk stands for baseclock and is stock 100mhz. So 38x100=3800mhz. Oc on non k is really simple. They are limited to oc 4 multipliers higher. You can try to set a higher multi but it won't. K cpus can go higher multi, that's the only difference. The set multi is the highest turbo speed so the stock multi is 38. He should have set multi to 42 (the max for that cpu) so would have known it would have gone to 4.2ghz.
I should mention it's not recommended to change bclk for sb because it's also connected to sata, pcie, usb, etc., so can cause corrupted files. I figured you had asus as they are known to auto oc but you may want...