I'm in the market for a new gaming laptop. Because you can't easily upgrade the components in laptops, I'd ideally like to buy one that has the potential to run VR. However, my day to day needs do not demand that much GPU power, so I'd like to buy the minimum hardware spec I can get away with.
I know I could wait until the headsets come out and a new generation of GPUs is around to support them, but I'd prefer to make the purchase now if possible, as it'll save me a bit of tax.
So I've done a bit of research and my understanding is that Oculus are suggesting desktop grade GTX970 is the minimum. That would suggest that a 980M ought, in practice, to be able to support an Oculus Rift. However, I believe I'm right in saying that the 980M is still integrated rather than a separate board, and that it uses Nvidia Optimus. To be frank, I don't entirely understand what this is, nor why it's a problem for VR.
I also know that there's a new desktop grade 980 out, suitable for laptops. This is expensive and doesn't have wide distribution. I also don't know whether this is board mounted/uses optimus or not. I also don't know if it's G-Sync enabled, as this seems to be a good idea for VR.
I was originally looking at the Asus ROG G752VT as it seems to offer excellent value for money. But it's got a 970M, which I suspect isn't going to be enough and is going to run into the optimus problem.
So the baseline question is: what's the mininum specification I need to get a laptop-ready VR.
Bonus points if you'd be kind enough to break this down into:
What's Nvidia Optimus and why is it a problem for VR?
Is the "desktop" 980 significantly better for VR than the 980M, and is it Optimus/G-Sync/separate card?
Will my preferred option of the Asus ROG be enough, at a push, for a Rift?