That board should be fine. It has an onboard headphone amp and the DT 990s are on the easier to drive side of being 250 ohm.
https
/www.asus.com/us/Motherboards/MAXIMUS-VIII-HERO/overview/
"ROG provides you with the very best gaming-audio inputs and outputs, with special shielded designs, and a collection of carefully selected professional-grade audio components, including an ESS ES9023P digital-to-analog converter (DAC) with Hyperstream™ technology, ultra-low-jitter clock, Nichicon capacitors,
2Vrms headphone amp, and Sonic SenseAmp that automatically detects and optimizes any headset (32-600 ohms) for purest sound quality. SupremeFX 2015 also features intuitive Sonic Studio II for you to apply and enjoy different audio effects for perfect entertainment, plus Perfect Noise noise-cancellation technology for team conversations with total clarity."