Tested on both vray next for 3ds max and standalone
PC1 - 32core 128Gb RAM 1080TI
PC2 - 8core 64Gb RAM 980TI
10Gbit LAN, both pc same vray 4.1 and same nvidia 417.22
4k frame on PC1 - 5m 12s
4k frame on PC2 - 7m 35s
4k frame PC1+PC2 - 6:09
So adding extra machine with another GPU made the render slower. lol.
I`ve tried dozens of render setting adjustments trying to figure out what`s going on, but nothing. Both GPUs are running at 100% load all the time(checked with GPUz), scene is only geometry and lights, no textures, only gray material, no displacement, no motion blur or dof. There is no excessive traffic over LAN or stuff like that.
Running distributed, with just the PC2(use local host unchecked) works as expected. But when both of them run together, it`s, uh, eh..useless 
As it scales well here with the scenes that we have tested with, having the scene will help us greatly figuring out what is going on.
Best,
Blago.
I uploaded this sample scene for you, archive name is : TheCrew_HarryGarage_BenchScene_Ver01_GPU_VR.rar , hope you can find it on your ftp, pm me if something is not clear. good luck 
Some of our QAs will check it up, @matanov @Margarita.Stoeva and get back to you.
Thanks!
Best,
Blago.
It’s reproducible here. Will get back after some investigation, thanks for the scene!
BTW the DR version of the image seems a lot cleaner which sounds logical since it takes more time to render but something’s definitely not right here.
my suspicion was that you are calling standalone in server mode to pick up the distibuted job, and bucket GPU settings are not being passed correctly from max app to standalone…, but that`s just wild guess. You know better
I’m comparing local standalone vs DR, so that’s not the case (unfortunately).
@matanov Hi, just checking if you found out what the issue was and if it was fixed in any late builds/nighlies… thank you.