> cos it won't look any worse, but using HLSL or GLSL it'll look a fuckload bettah.
Seconding that. If stuff like crt simulation shaders are your thing the higher resolution the better indeed.
Honestly even 1920x1200, which is the first step up full-hd, already shows a difference with more details and realism.
2560x1440 is commonly a favourite. 4K I wouldn't recommend without a fairly decent and up-to-date pc setup.
> MAME isn't about playing the games anyway.