probably, but not by so much that it will cause major problems. It would still likely outperform the a10 + 7870 combo so the bottleneck probably won't be that bad. especially if you don't mind trying to overclock a bit to reduce it.
In cpu dependent games you will see a few less frames but if you decide to overclock the stock cooler is not up to the task. Even with the igfx disabled running discrete. The 7950 is about the best card you can get for the price,