Will ddr4 mother board support ddr3 graphics card

Solution
Well, comparing to the HD530 Intel integrated graphics, the 730 is still better and if the card is already bought, plug it in:
https://www.youtube.com/watch?v=gyXCt8CgSm0

If not bought yet, better get a GT1030, if budget is very small.

So it´s a bit dependeing on which CPU and motherboard you will get or have. Please tell us those two components.

Yes, there is no requirement for the motherboard to support any particular type of memory in a graphics card.

The 'DDR4' refers to the type of system memory that you need to buy for plugging into the actual motherboard. The graphics card itself can have whatever type of memory built into it (DDR3, GDDR5 etc.)