When it was all flattened to one layer it was about 650Mb, but when I was working on it, with 100+ layers at some stages, it could be over 2 Gig, but then I have got 64 Gig of ram.
I wonder if/when Adobe will upgrade Photoshop to take advantage of the 2 graphics cards. Anyone know? I don't ever plan on doing any video stuff so I got the mid-range graphics option, but I did get the 1Tb internal drive.
The one thing you tend to overlook is the extra stuff you have to buy with this new machine - I've got most of my work on a LaCie 3TB dual drive raid Thunderbolt drive + I bought a Pegasus thunderbolt box that will hold 4 x 3.5" drives. All that was stuffed inside my 'old' Mac Pro tower - it's still there with lots of my work on it on my network. I also got a new Apple monitor, but I'd love a 4K one some time.