What have you guy's achieved on the HIS IceQ AGP Radeon HD 4670 1GB DDR3?

I was looking over it's BIOS in RBE and it appears it's at it's max 3d volts at 1.250v and 750mhz.

I'd like to Pen Mod this to pull 850Mhz if possible... Maybe a little on ram too... Just need to add heatsinks.

THANKS