It will bottle neck it to some degree but what gpu do you have installed now ? the e 7400 is a older intel dual core while it was fast in its day its showing age so its like saying I have a 32 ford with a flat head v 8 im going to put a new tranny in from a 2012 mustang and see what happens im sure any card you have now will be slower then the newer card but it all depends on the CPU