Resolume Forum

Dear all:

I am using dual nvidia 1070 (z370) + 8700k, macOS: 10.13.6, using arena 6.1.1 for mac

I am using 3 monitors on each graphic card, total 6, (each 1920x1080), playing hap video, 4k

when using arena alone, the video played quite smooth, without any problem.

but when using syphon output to other app, the video is stalling, even can be noticed just in arena preview window

if using just one GPU, the stalling is disappeared, all went well again.

Please help~~ is it my hardware's problem, or syphon is not support two nvidia gpu cards?

Dual nvidia hackintosh... you're brave

Any reason you're not using the latest 6.1.4 Arena?

Sorry, I did not notice the newer version, will try it tomorrow.

Meanwhile, i used windows 10 and arena 6.1.1 for win, spout to another app, if using dual Nvidia 1070 output, got stalling too, but smooth with single GPU output

I will try 6.1.4 and 7, but i don't think that is the answer.

Yeah, it's probably the apps rendering and sharing the textures on different GPU-s.
Do you have both programs assigned to the same GPU for sure?

Alternatively if your other app supports NDI, you could try that as a workaround.

The 8700K is probably your bottleneck:

Intel 8700K Expansion Options
Scalability:1S Only
PCI Express Revision: 3.0
PCI Express Configurations: Up to 1x16, 2x8, 1x8+2x4
Max # of PCI Express Lanes: 16

You mean the number of PCIe lanes ? I am using x8 + x8 now. maybe x16 + x16 should work?

The issue is that your main GPU (the one with the UI) is doing the rendering for both GPUs, and right now you're using it at half speed so in essence, it's doing twice the work with half the power so you're at 25% return on your investment!

The ideal way to do what you're trying to do would be to use a Datapath FX4 or even an older X4 so that you can get UI, +2 from GPU, +1 from GPU to 4 on Datapath.

Also, do yourself a favor and convert all your media to DXV3!

for that, Datapath FX4 is not directly sold in my country, using some agent to buy needs at least 3k us dollars for one

I am now trying quadhead2go, but it still not releases 1.0 firmware (0.9 beta is also works, btw)

for now, I will try PCIe4.0 8x+8x while waiting the 1.0 firmware

also, if not using spout to other app, the video is played quit smooth by arena when using six output (dual GPU)

so it is not the first gpu do twice while bandwidth 50%

BTW: using newest version of arena, still get stalling

I think is the apps i use to receive spout / syphon, did not process video data / texture like arena, which using main GPU alone