4u2ges (8/8/2018)
Pretty darn amazing! Even with ~200 s/px, which is what you probably got for the mirror shot. And mirror it's usually hardest as those fireflies is hard to get rid off fast.
I would personally settle for 15-30 sec per frame for animation (given that the scene build up would use smarter algorithm than Indigo did).
I am now thinking about adding a second GPU (probably external). Need to do a little research in this matter.
Alright, then look no further. Yes, get another GPU. Get 3 more. It will be expensive, yes, but will be worth it. Get 5 more.
I have a mobo with a (1) Titan X as the lead video card, (2) a Titan Xp on Mobo, and then 2 Amfeltec splitters for 6 more Titan X Pascal (not Xp). 8 cards total.
So, my speeds are totally biased in that it is not a simple 1 card set up. With iClone, I only use my main card, the other cards go unused.
But in Octane land, this many cards is commonplace for the most part, and I get to use all of them.
With an expectation of 15-30 seconds, you will see good results. And if you have a multi-GPU rig, with denoising,with 4-5 Nvidia 1080s, renders @1080p will be easy in that timeframe.
(Octane has a firefly reducer slider, it really helps greatly. Otherwise, like you say, you will need more samples to knock them out, even with denoiser. The mirror one was 80 s/px.)