[ahmadyan]

Google is your friend: https://www.apple.com/mac-studio/specs/

Apple M3 Ultra chip 819GB/s memory bandwidth

They have 96, 128, 256, and 512GB variants my friend.

[icedchai]

They stopped selling anything greater than the 96 gig variant a while back. If you want more RAM, be prepared to bid high on ebay.