Do you have the user's manual? if so check out page 26. To change the memory voltage you have to move the jumper pins on JP1 and JP2 (just below the RAM slots and above the floppy cable connector). the default is both jumpers on pins 2 and 3 (2.5V), for 2.6V move the jumper on JP1 to pins 1 + 2 (not moving the one on JP2) and for 2.7V move the jumper on JP2 to pins 1 + 2 (with JP1 being set to pins 2 and 3). without a picture I think thats the best i can explain it. post back if you need more help...