eh? Didn’t you just ask this?Amp for dt880 600 ohm My answer for competitive headphones would remain the same in that price budget. Atom is fine but recommended upgrading if going with the 600 ohm it won’t sound it’s best. Amp like asgard 3 or others in the $200 range bring out it’s sound just fine. Other headphones remain the same in that recommendation. In the $300 price range. You would have to get up into the $400-$500 which is usually what I consider the maximum for gaming based gear.
There is a difference in sound between the ohms. 600 ohm sounds better. Not as peaky not as sibilant more smooth more detail it’s much more refined when it’s properly powered
Edit: here perhaps these will help you more. these are two trusted guides one thorough and goes through it based on budget and performance the other is zeos’s review based on low-fi mid-fi and hi-fi sound and their respective budgets