From this Phoronix article, the A10-7850K loses or just keeps up with a 54 W Haswell i3 while other tests show it's comparable to an i5. 80% of that isn't going to make things better. Of course, I need to figure out how it translates to what I plan on doing. I started clicking on the Open Benchmark links to see what these tests do but I'm still having a hard time due to some descriptions being too vague for people like me who are unfamiliar with such software. I plan on making a mini-ITX PC that replaces a micro-ATX one. Right now, the current PC not just acts as an HTPC but as a NAS, video transcoder (HandBrakeCLI since I'm not a video expert), archives/backs up data in .tar.xz that currently can take a pretty long time (I use Pixz because it support multi-threaded decompression), backs up stuff to Amazon S3 (aws-cli) and runs a VMware VM or 2. Of course, all of these aren't likely to run at the same time but several of them can be.
I don't keep up much with CPU performance until I plan on upgrading but so far, I may get more bang for my buck with an Intel chip. Do you know how much an A8-7600 chip is going to cost?