You really shouldn't try to overclock Geforce GT 730, that card doesn't even have a connector to the PSU, overclocking make your card consume more power, and the power provided by PCIe slot isn't enough. Modern GPU's and CPU's have builtin automatic thermal protection that automatically disconnects power if its temperature is too high, because GPU's and CPU's have an upper limit of temperature at which it can safely operate, beyond the temperature the circuits will be damaged by the heat. Modern CPU's and GPU's have hundreds of millions of transistors over a small area, that switches on and off billions (what Giga- means) of times per second, this is how most of the heat is generated, and faster clock frequency means more electricity consumption, and physics dictates the usage of electricity creates heat, heat dissipation is the factor that limits us to 5 GHz CPU's. Graphics card generate huge amounts of heat, what do you think those fans on the cards are used for? The more calculating power the more heat it generates. If MSI Afterburner can do that, then all the people buy better graphics card are fools, why should they buy better cards if MSI Afterburner can magically boost their cards by hundreds of megahertz's and achieve the same results for free? So unfortunately, the hard truth is, overclocking can't really make your games run faster if your graphics card is low-end, do you really expect MSI Afterburner can make your GPU run continuously at Core frequency at 870 MHz and memory at 980 MHz without frying your Graphics card? I used GpuTest on that card and the results were ugly, so I replaced it with Geforce GTX 1050 Ti, and now only the Piano test has beaten my card, this card is still not top notch, however it should be enough to handle games from before 2015 at 1080p and games after 2015 at 1080p at low settings.

Just upgrade your graphics card, I used MSI Afterburner on my previous card Geforce GT 730 not long ago, mine has Core base clock at 910 MHz, and I can't even add 200MHz without it crashing.

Msi afterburner gpu overclock