Well U Need To Upgrade Ur Cpu . Ur Ram Is Ok Ur Gpu Upgraded Well . So I Suggest U (2 Options) :
If u Have Money In Budget Go For Intel Mobo And Get A Better Intel Processors
If U Dont Have Enough Money U Should Afford A Better Cpu In The Same Socket :
https://pcpartpicker.com/product/CjyxFT/amd-cpu-ad787kxdjcbox
But I See About 5% More performance With This Cpu So I Extremely Dont Waste Ur Money Buying This Cpu
U Can Overclock Ur Cpu Too To See Lower Bottleneck Until U Got Enough Money To Change Ur Mobo
The AMD Athlon x4 860K has an unlocked CPU multiplier. You simply raise the multiplier to over-clock the CPU. The clock speed of your CPU is determined by the multiplier times the clock speed.
For a stable OC, you should disable 'Turbo' and take manual control of your CPU voltage -- that's pretty much it. Use AMD OverDrive to monitor your CPU temps and test for stability.
Keep your volts as low as possible -- higher volts = more heat. Good aftermarket cooling can help keep your temps down and increase your OC.
U may See Instability Higher Than 4.2 Ghz So You should likely take manual control of your voltages, and keep then as low as possible.
Regards