Thanks for help guys,i updated my bios and i'm not able to oc so i'm worked hard to downgrade my bios version and i'm successfull.i can go to 3.8 ghz without changing voltage but at this point i'm still having bottleneck,at 3.9 i need to give 1.52v , at 4ghz 1.53v is stable and my temps wont go more than 56-57degrees and my bottleneck gone(still have but its too little). also i added 4 gb ram ,in total its 8 gb.if i stay at 4ghz with this voltage will it kill my chip fast or it can go for 1 year?