the first card Amazon send be difficult to make it through a complete boot without receive a blue screen . even once the system be up and run it might be minute or it might be hour but never fail the computer have a hard time go more than a day without hang at a blue screen . Amazon make it easy to request a replacement through they website and within 48 hour of give up on the first unit I have a new one at my door step with a prepaid return label to return the original . the new unit seem to be function much better than the original and though it have give I maybe 2 blue screen early on in the week it have be install but otherwise it have run well with 24 hour a day operation . the two time it have crash since install it be two more time than I would like but be a vast improvement over the original unit and it have currently be run continuously for a few day without issue . this be buy as a replacement for my aging pny 9800 GTX + and performance be a vast improvement over the old card . installation be easy and while I be not able to use a simple flip of the bio switch to increase the shader count -lrb- a quick opening of the bio backup show that it do indeed change to the second bio which have the set to unlock the extra shader present , the card itself just ignore the setting and will not use the extra shader -rrb- this be more of a slight disapointment than a deal breaker . other than the initial issue the card seem to be run and perform solid . I will continue run the card and report back if I have any additional issue .