Hey marco,
But hes not talking about the rendering. He's talking about using it. And the computer dedicating the gpu to the app, WILL help him!

But, its still unclear, frenchys question needs an answer.

1 = 5 gb file? 16gb of ram will be woefully inadequate.

2 = 5 million poly's? Thats pushing his system pretty good. Probably could do some optimizing to make it usable...