No, you have to disable gtx 440 for octane if you want to use it for display only.
If you use both cards for octane the the smallest VRAM is used by octane, in this case 1280 MB from GTX 570.
I have GTX 260 892 MB and GTX 550Ti 2GB.
If I use both cards for rendering I get a speed boost about 30-40 ...

Hi

I am planing to buy this two cards the GT440 4GB GDDR3 and Asus GTX 570. The GT440 4GB GDDR3 is for the display and the Asus GTX 570 is for GPU rendering.

If I select the GT440 4GB GDDR3 for my display it means that the Software detects the 4gb of ram in my system?

Please help

Thanks
Chill