I did it on mine.. basically it adjusts the cpu fsb to ram ratio divider.. i set my e6320 to 400 fsb and the jumpers to 4 and 4 i believe.. That gave me 1 to 1 ratio on ram and fsb so my ddr2-800 wasnt smoking..I believe it was 4 to 5 before i touched the jumpers so my ram was clocked really high and bios wouldnt even post.