dpi (in fact ppi, pixels per inch) has no effect at all on anything here. It only tells that, when printed, each inch will have 300 pixels. Or 72 and be a bit more than four times larges than at 300ppi). What counts is the file size. 1600x1200 is not large. I have rendered 4500x6000 pixels. When you're having trouble here: 1/ check for spyware 2/ see that all is closed that is not needed. 3/ run defrag 4/ get more ram. Poser renders horrendously slow, so you may think it has frozen, but it hasn't. Just take care when your uter goes into sleep mode as this can influence things.

I have tried prudent planning long enough. From now I'll be mad. (Rumi)