266.58 driver i don't think were well optimized for this our GTX580, 260.70 & 270.51 i think are the best drivers we can have for our GTX's, btw i do not really care about that bla bla driver not approved on the 3dmark11 page...... :|

i've made two runs, 1ghz gpu & 992mhz gpu with 4.5ghz on cpu