so a graphics card will let me use this monitor via hdmi cable ?Buy a cheap graphics card , 1500 - 2000 Rs , instead of buying new motherboard .
no gamingIf you're investing in a 29" monitor, at least get a 7-8k Graphics card. NO point changing motherboard, a good graphics card will be best for making the best out of your monitor.
Just out of curiosity, why are you going for this 30k monitor? I hope you realize that gaming won;t be quite good on this and the aspect ratio will lead to black bars in HD movies. What's your main reason for this monitor?