I do not believe that an upgrade is worthwhile and might not even be possible. The A10-7800 is an socket FM2+ APU, the fastest FM2+ APU is the A10-7890K and the fastest CPU is the Athlon X4 880K. Moving to either one of these is not a significant improvement
https://www.cpubenchmark.net/cpu.php?cpu=AMD+A10-7800+APU&id=2262
https://www.cpubenchmark.net/cpu.php?cpu=AMD+A10-7890K&id=2744
https://www.cpubenchmark.net/cpu.php?cpu=AMD+Athlon+X4+880K&id=2747.
In this chart you will find the 7800 and 880K as tier 4 CPU's, a significant upgrade would either be tier 2 or tier 1. Tier 2 CPU's are really all old models so you would likely be looking at a tier 1.
http://www.tomshardware.com/reviews/cpu-hierarchy,4312.html
So do you want to proceed with designing a build and if you do, can you supply your budget, country of purchase, any preferred online vendors and state if you will need any of the following: Operating System (OS), Monitor, keyboard/mouse, Wifi/bluetooth connectivity.
We should also look at your current components, likely we will be able to salvage some of them. If you are not sure what they are you can download either of these safe, free programs to inspect your hardware.
CPU-Z
https://www.cpuid.com/softwares/cpu-z.html
HWinfo64
https://www.hwinfo.com/download.php