I don't see much advantage in upgrading the A10 6800K CPU, ever... as their would be a very small increase in performance, like 10%
http://wccftech.com/amd-a10-7850k-performance-previewed/
n terms of CPU performance, the A10-7850K is overall an improvement over the A10-6800K. Especially in PCMark 08, the A10-7850K was about 10% faster than the A10-6800K. Our GeekBench benchmark indicated lower single-core performance, but as more and more programs use multi-core technology, that is really not even much of an issue.
The A10-7850K is the fastest A-series APU currently available, yet the CPU performance is much lower than even the Intel Core i5-4440 which is only a mid-range Intel CPU
I'd put my money into a GPU today. When you want a CPU upgrade, replace the Motherboard and CPU will be you only real choice for a Big performance boost.