Gigabyte g41m combo restart after overclocking and sets back 2 default

Sounds like the motherboard booted up and detected a failure in the overclock and reset the defaults to allow the system to boot. Many of the motherboard from that generation did that to save you from having to reset the defaults manually with the motherboard. I'd imagine there's a problem somewhere with stability of that overclock. Try minute increments when overclocking those chips.

even if i increase from 333 to 340mhz also it is restarting??, i've seen ppl overclocking that g41m motherboard, any1 out der to explain properly,,..

my motherboard bios, options goes like this

http://imageshack.us/a/img402/7646/20130120094731.jpg

http://imageshack.us/a/img818/8686/20130120094703.jpg

http://imageshack.us/a/img254/3475/20130120094740.jpg

any 1???