Hi Nance, I've tried it again, checking the windows system monitor.

Everything closed down except systray & explorer - 213.8Mb

Poser Pro loaded with empty document window - 257Mb

Vicky 2 Loaded - 280.3Mb

SDMAT chainmail full (Daz Gothic Armour) - 287.3Mb

Vicky 2 fully armoured in Gothic Armour - 324.6Mb

Render at 530 x 600 pixels, 351.9Mb while rendering.

So, Poser Pro Loaded = 43.2Mb

Vicky 2 Loaded = 23.3Mb

Vicky 2 & SDMAT = 30.3Mb

Vicky 2 & SDMAT & Full Gothic Armour = 67.6Mb

Does this sound about right?