autechre is the only place you will find this sound.
Boards is completely different, a separate musical world.
Aphex Twin, Selected Ambient Works: Vol. II is awesome though.
Quaristice remains like, one of my favourite recent ae albums; it's just kind of a fun piss-take in some ways. It feels really casual and peripatetic, which I really like; lot's of good ideas, loads of crazy dense reverb.
I remember when this was released in 2008, I was in Tokyo, such fond memories. The Japanese love Autechre, so much so weeks prior to the Albums release they were blasting Gantz Graf on the streets of Shibuya on the big video screens. Amazing.
Incunabula = 3~6 years ahead of its time
Tri Repetae = 10~15 years ahead of its time
Confield = 100~200 years ahead of its time
Quaristice = 1000~2000 years ahead of its time
Autechre = music from the remote future
I heard that this album was born of some jamming, and it does sound like it. In some ways that's a good thing, though. Autechre is often revered for their ability to make very cold, mechanical, and fascinating sounds; that they can take that expertise and make something that sounds organic, soft, and warm, without sounding like they TRIED to, is fantastic. That's one thing that always struck me about Autechre: how effortless their music sounds. No tropes, no typical chords, just brilliance. Wow.