This is an old motherboard made for intel core 4th generation processors.
With this motherboard you can connect any graphics card up to GTX 1660 super.
But
With this motherboard you can't able to play games more than 1080p resolution.
So the recommendation is that you should not purchase a high graphics card with it.
Even the Budget graphics card called GTX 1650 with the processor supported.
Good options
Maximum GTX 1650 or GTX 1050ti will be good option for your motherboard.
Still check the price difference between both.
If the price difference is too much then GTX 1050ti will be good option.
But if the the price difference is not that much then GTX 1650 will be a option. As you can combine it in future with your new motherboard also.
You can now buy new or refurbished Dell Optiplex 3020 LGA1155 Motherboard 0VHWTR 040DDP at best price in India.