Can only activate 1 out of 2 GTX580 cards

[Gaz]

Hi All,

I have just installed the latest demo (12 April) on 64bit Win7 with 2 x 3GB GTX580 cards.

Both cards are recognised by octane. I can see them both in CUDA preferences. By one card is active and the other inactive. When I click 'Add' to activate the second card, it just swaps places with the active card.

In other words, I can only active one or the other card. It won't allow me to active both cards at the same time.

Is this a limitation in the demo, or is something strange going on?

Thanks!
Gareth

[Gaz]

I may have answered my own question:

Sorry, but we had to take the multi-GPU functionality out of the current demo version. We did this to reduce the confusion about the different CUDA versions. This allowed us to release CUDA 3.2 builds only. When the new multi-GPU framework is set up and runs properly on CUDA 3.2 or 4, we will release another demo with multi-GPU enabled again.

Cheers,
Marcus

With respect, if this is the case, it rather defeats the object of the exercise

[abstrax]

I may have answered my own question:

Sorry, but we had to take the multi-GPU functionality out of the current demo version. We did this to reduce the confusion about the different CUDA versions. This allowed us to release CUDA 3.2 builds only. When the new multi-GPU framework is set up and runs properly on CUDA 3.2 or 4, we will release another demo with multi-GPU enabled again.

Cheers,
Marcus

With respect, if this is the case, it rather defeats the object of the exercise

Believe me, it does not, because getting Octane to run on more than one GPU can be quite tricky, depending on the OS and GPUs. And the demo downloads page explicitely states that multi-GPU functionality was taken out.

Cheers,
Marcus