I want to get the 250 ohm version of Beyerdynamic DT990
I currently own Fiio E07K. Will it be enough for this headphones?
You posted the same thread 3 times in different equipment forums here, that's not good practice.
Also if you would have used the search function you would have found at least these three threads answering your question:
Asking you question a bit "nicer" will as well enhance your chances of someone spending their free time helping you.