Octane Trial License One GPU Limit, what about NVLink?

Diaspora

So, maybe this is wishful thinking but let's say I had dual 3090's connected to each other via NVlink? Would Octane see the GPU's as one single GPU?

nicstt

That would still be 2 GPU. The NVlink links 2 GPUs

TheMysteryIsThePoint

Physically. But it is reasonable to ask how the driver presents linked devices to applications logically. You may ultimately be absolutely correct, but it's at least a question worth asking; the driver could very well fool usermode applications into thinking that there is just one GPU with twice the cores and VRAM.

DrunkMonkeyProductions

From what i get from the octane forums, no, octane still sees the gpus as individual.

There's some weirdness with octane, standalone or plugins, and nvlink where certain things have to be enabled, such as out of core memory, just to utilize the additional ram, and the scene has to exceed the base ram of the cards, then it starts pooling.

overall, it seems nvlink and octane is a bit of a mess.

 

 

nicstt

TheMysteryIsThePoint said:

Physically. But it is reasonable to ask how the driver presents linked devices to applications logically. You may ultimately be absolutely correct, but it's at least a question worth asking; the driver could very well fool usermode applications into thinking that there is just one GPU with twice the cores and VRAM.

If that was the case, I'd expect it to get fixed!

TheMysteryIsThePoint

nicstt said:

TheMysteryIsThePoint said:

Physically. But it is reasonable to ask how the driver presents linked devices to applications logically. You may ultimately be absolutely correct, but it's at least a question worth asking; the driver could very well fool usermode applications into thinking that there is just one GPU with twice the cores and VRAM.

If that was the case, I'd expect it to get fixed!

It could be considered a good thing... then applications don't need any specific changes to support NVLink; the driver is doing all the work. I bring that up because in a conversation I was having with the guy that wrote E-Cycles, in a different context, he said that E-Cycles will just respect whatever the driver reports to it. But it was for Linux, and I'm not sure what the Windows NVidia driver does.