if you want to bench at 1200mhz core, you better play safe with the voltage
those gt200b gpu's don't scale with voltage like other gpu's do ( yes 8400gs... i had one of those too )

it will indeed be great to see how that 10phase pwm performs. The pwm on the GTX260 lightning did a reallly good job, we had no problem benching at nearly 1100mhz core on the GTX260 lightning, stock card, without any vmods at all

however, the Polish guys already proved that its not only about massive core clocks