8800gts with a gtx card

[havensole]

If you're going to use both cards for rendering you will see better performance by using two of the same generation, but if you're just using one for display (the 8800gts) and the other for rendering it doesn't matter. You just need to tell the device manager to use the second card and remove the 8800gts.

[radiance]

i'd recommend you add a GTX400 series card as a 2nd headless card for octane render, and keep the 8000 as your display card.

Radiance

[arexma]

You should use *only* the 400 series card for rendering, and remove the 8800 from the renderer.

The 8800 has only 320MB VRAM, so that will be the maximum available no matter how much VRAM the second card has.
And the 8800 will slow down the 400 series card running in mixed generation mode with such a performance gap between the two cards.

[3drealism.com]

Hi,

I have a 9800GT as my non-render card. I am getting a GTX460 2GB card for rendering. If in the future I buy another 2GB card but faster say a GTX480(if it does become available as a 2GB card in the future) - will these 2 cards at different speeds work happily together for rendering?

Theo

[kubo]

yeap, they'll work fine together, just keep in mind, that when combined your vram will be that of the gpu's that has less quantity, say if you combine the 460 2Gb and the 480 1,5Gb you'll be able to use only 1,5Gb, since Octane needs to upload the whole scene to each GPU involved the one that has less will limit the rest. But topping that much vram is not so common as it may seem, so in most cases you'll be fine and you'll gain a lot of speed.