I'm in the process of upgrading my PC's sound output somewhat.
For years I've been using a succession of budget soundcards (Live 5.1 => Audigy something => x-Fi Titanium) cinched to a JVC MX-J500 stereo that drinks and votes by now. So I still have the x-Fi Titanium PCIE (non-HD) I bought years...
As per title. Obviously just about any potato will provide enough volume (like listening to the 400SEs straight from a phone or laptop), but I'm talking about the Hifiman planars reaching their true potential and transforming from underamped ugly ducklings into whatever they were meant to be...