I am wondering if this card's dvi type is DVI-I or DVI-D, also wondering about how overclockable it is, like will it be able to reach the performance of the HD 5770 when overclocked to its maximum potential?
It's DVI-I. I own a 5750. I haven't overclocked it yet, though. But I'm sure that with the proper overclock It can be capable of reaching 5770 performance, although it is at a disadvantage because of the disabled stream processors.