Based on the info you posted, one has the AX240 radiator, the other has the EX240 rad, the AX will cost more but isn't worth it performancewise,
and you really want more than a 240 anyway, way more
Check out the W/c sticky to learn how to calculate your TDP, and from that you will know how much rad you need, if you want a quieter system then you add more rad on top of that number,
and is that card the classified edition or another variant?
Moto