AMD A10-5800K overclocking???

I have an AMD A10-5800K and have it clocked to 4.3GHZ with 1.3438 CPU voltage and the ram speed is 2133 at 1.60 volts,the CPU stays below 40 degrees celsius under load and around 10 degrees at idle.I used AMD Overdrive to overclock it and ran Burnin test twice to check if it was going to be stable and it showed no errors.Is this a reasonable speed to keep running it or is it too much of an overclock?

It has some more room, 4.5 or 4.6 shouldn't take too much effort but you'll probably hit a voltage wall somewhere around there

There's no way that's too much. You can push it even further like people already said

Raise the voltage to 1.4V and try. Also don't forget to stress test.

Anything 1.4-1.45V should be okay.... but >1.5V is basically going to cause damage.

OH and it also depends on your motherboard... I found much more stable results in BIOS settings than I did with AMD Overdrive.