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Just for fun I let my Titan X render a simple scene with latest Maxwell 4.1.1.1

I know that GPU engine isn't finished yet, but so far I found in GPU version:
- much more blurred caustics (pretty obvious)
- blurred (or little bit moved?) shadow - quickly swap between images and you will spot the difference
- small cross artifacts (if you zoom in you can spot them)
- dark spots (maybe ray depth limitation ?)
- resume MXI doesn't work - reported also here

CPU - SL 13.01 time 7m 12s, benchmark 1316.68 (dual Xeon E5-2680v2)



GPU - SL 29.20 time 20h 06m 25s, benchmark 5628.90 (Titan X 12GB Maxwell architecture)

The shadow difference can be related with antialiasing. The main change, as we know, is that gpu engine can do caustics trough glass. Still CPU has some caustics on the right side that disappears on GPU.

Interesting test, thanks T0M0! I very much like the visible caustics through glass version of the GPU render but of course not the blurring. Would be curious to see what both look like and time if you let them render to SL 20.

Thanks Mihai, here they are both rendered to SL20.

@luis: Will be caustics quality improved in GPU engine in next release ?
Related to caustics through dielectrics, will be CPU engine improved too in future ?

CPU - SL 20.01 time 2h 12m 36s, benchmark 1227.73



GPU - SL 20.07 time 30m 06s, benchmark 5542.86

Answer is no to both, at lest in short time. Caustics are difficult on gpu, as gpu engine is a PT, no BPT, so we can try to improve some scenarios, but the technique itself make it difficult.