Can I use Sapphire R7 250 gddr5 to my A6 5400k?

Solution
Assuming it fits, and that you have a half-decent (or better) 300W+ PSU, then you can use a R7 250. If you can afford it, as voyboyfan suggests, get a GTX750 or GTX750Ti, which are both much stronger and use about the same amount of power (most versions of any of these three cards do not need auxiliary PCIe power cables).
Assuming it fits, and that you have a half-decent (or better) 300W+ PSU, then you can use a R7 250. If you can afford it, as voyboyfan suggests, get a GTX750 or GTX750Ti, which are both much stronger and use about the same amount of power (most versions of any of these three cards do not need auxiliary PCIe power cables).
 
Solution