Beyerdynamic dt990 250Ohm help.

[XxCyrexX]

Hello everyone I am new to the forum but I have been following for quite a while now. I have a simple question and that is I have a new pair of dt990 pro 250Ohm headphones from beyerdynamic and I was wondering what would be my best option for an amp. Currently I have an Asus Maximus V Formula with the Supreme FX IV on it which says it can power up to 300Ohm headphones, I also have an old Asus Xonar Xense that has a 600Ohm Headphone amp in it which is just lying around, and last I have a new Creative SoundBlaster Z which also has a 600Ohm headphone amp in it. Out of those options which would you guys recommend me using for my headphones.

[needmorewood]

its doesnt really matter i dont think
would just go with onboard so you can deal with less drivers and software
worse case scenario if you feel like they dont get loud enough you can stick one of the other sound cards in but i doubt you will have to do that

[Lauen]

The onboard should be fine, but if it doesn't get loud enough or there's crackling, just put in that Xense card. 

[ShearMe]

What the guys above said.