Regarding the reported bug, I’m still investigating, but at least using an HDRi from HDRi haven (as I don’t have pro lightning skies) on RTX cards and even using the 2.8 april beta with scrambling distance, it looks the about the same in buildbots and E-Cycles:
master:
E-cycles even has a firefly less.
the only thing i dont like about E-cycles is that i haven’t used it earlier
Classroom
Official Master 2.8 01-04-19 16x16
1x 2080ti 1:34.82 289M = 1x
2x 2080ti 0:49.80 289M = 1x
= 1,90 Dual Gpu Ratio
E_cycles_2.8_v20190402_win_multi_gpu
1x 2080ti 1:00.11 298M = 1.57x faster than 2.8 Master
2x 2080ti 0:33.70 298M = 1,47x faster than 2.8 Master
= 1,81 Dual Gpu Ratio
2.79 27_beta_april_feature_update
1x 2080ti 0:44.88 288M = 2,11x faster than 2.8 master
2x 2080ti 0:24.98 288M = 1,99x faster than 2.8 master
= 1,79 Dual Gpu Ratio
good work, can’t wait to see thoses result in 2.8
and with RTX its going to be a massacre
Thx for the times!
Since you have 2 2080Ti’s: Have you tried connecting them via NVLink to join the Vram ?
(2x 11GB => 1x 22GB) Is this even possible from the get go?
its possible but it need a programmer to code that.
i dont think that this functionnality will ever be implemented because its too niche.
Transforming a 980Ti into a 2080Ti for 42€ is possible 
Thanks a lot for the very serious test and the full logs. Very precious for in depth analysis on different architectures. It definitely helped to make E-Cycles even better 
Actually, to be correct, the 980Ti is even 16% faster than the 2080Ti.
Some of you asked for a video of a render session. As there was a lot of post today, I add it here again. Real render time without screen recording and compression is around 8sec per frame with one GPU only. It uses the preprocessing option of 2.79x.
2.8x with 50% off is still available for some hours with this coupon https://gum.co/tsTuV/gumroadday, 2.79x with this coupon https://gum.co/SeYhy/gumroadday
and if you want the 2x speedup and the AI denoising node on top of a branch of your choice like Mantaflow or Fracture modifier branch, you can learn to make your own Blender here https://gum.co/ecycle/gumroadday (with 30% off today)
EVERMOTION 09 BENCHES
Official Master 2.8 01-04-19 16x16
2x 2080ti 3:35.47 = 1x
E_cycles_2.8_v20190402_win_multi_gpu
2x 2080ti 2:08.78 = 1,67x faster than 2.8 master
2.79 27_beta_april_feature_update
2x 2080ti 1:56.36 = 1,85x faster than 2.8 master
carreful with interpreting this benchmark, e-cycles scale a bit less than 2.8 master, two gpu for my case in master is +1.9x power, e-cycles is 10% less, so for a single gpu the result would be better up there
the april update is still really good !
still in beta and 2.79 only tho
The beta is also available for 2.8x.
oooooooooooooooooh didnt see, i will update every benchmark with the added result of 2.8 april beta
Bought a copy of E-Cycles this morning to show some support.
Very appreciated
Glad you find it useful! The big benchmark using the Evermotion scenes is still coming!
Hum I am not seen any speed up here. All I see is the great Intel denoiser in action.With exactly same settings it is slower than Cycles. And to me Cycles have less firefly. Or am I missing something?
I would need the number and model of GPUs, and CPU if you activated one as well as the exact name of the build you used. I already hear problems of people having D-Noise activated in parallel. To avoid conflicts, it’s always good to try with factory default, then only activate the new AI denoiser addon and the GPUs without CPU.
ok, set scrambling distance at 0 (to get the E-cycles sampling, doc is coming) or at 0.02 for speed and clamp at 0 too.
1x 1060 + 1x 1070 + 1x 1080 working superb with Cycles. CPU is Ryzen 1700 but not enabled for rendering.
The new parameter can be tricky to use (scrambling distance) I will add a doc to explain how to use it soon. In the mean time, you can use the presets and set the spp as you wish or set scrambling distance to simply 0.1 and it should work in most cases.
If you still have problems, please provide a file and the steps to reproduce, I’ll have a look asap.
The doc will be my priority tomorrow to explain all the new functionality of the April beta
