After my 3850 died a death after several years of first rate service and with little spare cash I've just picked up a 4670 off that popular auction site. I know they're roughly similar in terms of performance but I was wondering if anyone had tried clocking the 4670? I'm not expecting miracles but I'd just like to give it a little boost until I can save up for a new-gen card in a few months. What can I eak out of this cheap as chips card?