have only done a very quick test, so don't read too much into it - looks like it's just using around 550-600MB for the most part, peaks to 800MB when starting the waste-disposal training mission and reduces again ... how representative is that right now though? probably not very... There'll be lots more ship types flying around at the same time and other future assets so usage is likely to increase I'd think... Also it's possible that resources are being held directly on graphics card too rather than local memory, so what may seem like low system memory requirement might be helped by my system having 2gb on the video card now.
It seems you've more memory on the way though, so you should be fine on that front once it arrives. Btw, if you've got 4 slots on your motherboard and it hadn't crossed your mind, are you able to add the 2x2gb cards as well as the 1x2gb for 6gb total... you've got win7 64bit so the more the merrier to give the OS and anything else elbow space!
I'll do a more thorough test on memory usage when I'm actually sitting at my PC playing a proper session... just been experimenting tonight with Steam streaming to my laptop - as this is likely how I'll have to play without 'the other half' leaving me, lol.
Need to figure out how to get my controller working but otherwise seems to run smoothly @1440x900 over WIFI (N) to my 5yr old laptop (4GB, upgraded to 2.5ghz T9300 core duo, 9600M GT mxm2 video and can't handle lowest settings right now). But I get 40-50fps streaming to it at this lower resolution, response seems pretty much instant, so I'll be chuffed to bits if I can 'be sociable' and do some trading at a weekend while pretending to watch that x-factor nonsense