Now that's very clear, it seems obvious when it's well explained !...
Looking forward for instancing support (users are always waiting for something more, don't they ?)

Ok, I get it now, thanks for taking the time to clarify.
Btw, that lowest common denominator thing is a pity, is it a cuda or an octane limitation ?

mmmh, this is confusing !
So, to put it clear : if I plug the 2gb GTS430 as my main card, and the 1gb GTX560 as the secondary one, octane will use 2gb ram and the processing power of both cards, right ?
And in general, the GTS430 will become the main card used by my system, and the GTX560 would only ...

Sorry to hijack this thread, but it's probably not worth opening a new one for the same kind of question :
I already have a GTX560 with only 1GB of ram. It's very fast, unfortunately a bit short ram-wise for octane.
So, I spotted a cheap 430 GTS with 2Gb of ram that I would like to use as a ...

Thanks for the hint, I was looking forward to achieve this.