Neat Video detects 3x GPU, Resolve detects only 1x GPU!

Hello everyone,
I am about to finish building a system with the following specs:

Supermicro x10DAX
2x 2683 V3 14-core Xeon
32GB Ram
Toshiba 480GB M.2 PCIe 3.0x4
3x RX480 8GB
Windows 10
Full Davinci license

The OS can see the 3x GPUs, Neat Video can see the 3x GPUs,
but Davinci Resolve only shows 1x GPU
prefs:
Use GPU for debayer: enabled
Use display GPU for compute: enabled

BTW I had a similar problem when testing 2x Quadro M6000
on a completely different system, so I may just be doing something wrong
in Davinci.

I did several tests and got quite good results without Neat Video.
Realtime 25fps playback of 6K 6144x4140 timeline, 6K 50fps R3D clip in Full Res Premium 10-bit after a bit of tweaking with the bios (turbo boost on).

With Neat Video, I got good results within the preferences>performance tab, up to 5.75 fps on a 4K timeline.
(This is much better than the 1.2fps Quadro M6000 or 0.7fps GTX 1070 that I tested btw!)

However, in actual playback, it would get me 1-2fps, maybe 3fps, but grind to a halt halfway through the clip.
This may be because Davinci doesn't see all of the GPUs?

By grind to a halt, I mean Resolve becomes unresponsive, I can't select other clips to play back, nothing works properly anymore and I need to quit Resolve and restart it.

AMD panel shows one GPU as Primary, with the other two showing up but marked as (disabled).
GPU-Z and system manager show no issues.

notes:
GPU usage during the neatvideo test averaged no more than 15%, CPU usage on turbo only 54%
RAM only 8GB of usage with 24GB free

But you have the studio version, do you?

Yes I do. As listed in the specs. Full license with dongle running on studio version of davinci 12.5.1

Have you checked that the preallocated memory in Resolve is set to 4000m?

Are the GPUs configured with SLI? Davinci Resolve doesn't use SLI.

-

Do you have any monitors plugged into your GPU compute cards?

jPo

Have you checked that the preallocated memory in Resolve is set to 4000m?

Yes, set to 4000m (default)

Are the GPUs configured with SLI? Davinci Resolve doesn't use SLI.

-

no SLI or crossfire

Do you have any monitors plugged into your GPU compute cards?

jPo

Had only one monitor connected to one display card

I assume you've also tried moving the GPU's in to different slots as different slots go through different CPU's on that motherboard, and checked you have the latest BIOS

I assume you've also tried moving the GPU's in to different slots as different slots go through different CPU's on that motherboard, and checked you have the latest BIOS

I tried 1 GPU plugged in, 2x GPUs and 3x GPUs. There was no other way to plug in 3x GPUs on the board as far as I remember but will check.

Latest BIOS and Radeon drivers, re-install of drivers after 2x GPUs plugged in.
Anyone with Radeon experience know why it says (disabled) only in the Radeon config panel?
But no issues reported elsewhere (control panel, etc)

I assume you've also tried moving the GPU's in to different slots as different slots go through different CPU's on that motherboard, and checked you have the latest BIOS

I tried 1 GPU plugged in, 2x GPUs and 3x GPUs. There was no other way to plug in 3x GPUs on the board as far as I remember but will check.

Latest BIOS and Radeon drivers, re-install of drivers after 2x GPUs plugged in.
Anyone with Radeon experience know why it says (disabled) only in the Radeon config panel?
But no issues reported elsewhere (control panel, etc)

I have the exact same problem man. No idea what it is. Thought my pcie on my mobo was dying originally. I might try rolling back to 11/12 for davinci.


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I know this is probably a dumb question, but you do have both the 8 pin power connectors connected to the top of the motherboard? People sometimes miss that it needs 2

What PSU are you using?

I know this is probably a dumb question, but you do have both the 8 pin power connectors connected to the top of the motherboard? People sometimes miss that it needs 2

What PSU are you using?

PSU cougar 1050W

I had one power connector that forked to two GPUs and one direct power cable to the third GPU. Should they all have their own power cable?

I'm sure I could be making a stupid mistake somewhere. Been on Mac for a while, I haven't used PCs for almost 4 years so have to get back into it.

The power connectors direct to the GPU should be fine, I was referring to the ones that connect to the motherboard. There are 3 power sockets on the mother board. 2x 8 pin connectors and a 24 pin connector all 3 are up on the top right

If it helps everything on my computer is hooked up fine and does not make a difference.


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If it helps everything on my computer is hooked up fine and does not make a difference.


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Is your machine the same as his? If not then it could be a different issue. Others on here have had Resolve working with 3 RX480's so it's more likely(but not exclusively) to be down to system compatibility issues.

If it helps everything on my computer is hooked up fine and does not make a difference.


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Is your machine the same as his? If not then it could be a different issue. Others on here have had Resolve working with 3 RX480's so it's more likely(but not exclusively) to be down to system compatibility issues.

Yeah it's not. Sorry.


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The power connectors direct to the GPU should be fine, I was referring to the ones that connect to the motherboard. There are 3 power sockets on the mother board. 2x 8 pin connectors and a 24 pin connector all 3 are up on the top right

I just went back to the shop where they are assembling for me. The ports on the supermicro board look occupied, but they told me the cards only connect straight to the power supply.

As I said it wasn't the ones going to the GPU that I was asking about, but looking at the top picture they have connected all 3 power connectors to the motherboard.

The reason I asked is because you need both those 8 pins on the motherboard to supply enough power to the PCI-e sockets, without that the GPU's wouldn't run properly as they draw power through the PCI-e sockets as well as the 8 pin direct connector.

I also assume that they have RAM sticks in against both CPU's

So this looks correct then?

Power wise yes, but looking at the pictures they only appear to have ram in against 1 CPU which can affect how the other CPU works.
Ideally you should have 4 sticks per CPU on that board to get it to run in quad channel

Thanks for your help so far, Adam.
I have 2x 16GB, one in each CPU panel (sorry don't know the word for it)
The CPU seems to be performing well, considering my 6K timeline real time result at 54% CPU load?
It's the GPU's not showing up in Resolve that I would like to solve

I've never tried to run a Xeon with only 1 stick against each CPU, that may well affect how it works as they are really designed to work in quad channel.

So which sockets do you have the RAM sticks in?

it looks like it's slot 1 on the CPU on the left, and slot 6 on the right.
I don't know either if this will work but the technicians at the shop said it
has to go this way.

Well going by the numbering of the slots I would have expected the RAM to go in the top slot on the right hand (CPU 1) socket up next to all the power connectors marked 'P1DIMMA1' and the bottom one on the left hand (CPU 2)marked 'P2DIMME1'

I'd also check just to make sure you are on the latest BIOS version should be R2.0a

Hi
Is "use gpu" in Neat video preference panel enable?

Yes I have tested several combinations and also ran the optimisation tool. Neat video sees all GPUs. But Davinci Resolve does not for some reason.

According to Rslv12 config guide, all pcie slots must be disabled in bios, with the exception of the one that has the gui card installed (the one with the gui monitor attached)- see page 25.
Have you done this?

Cheers, B.

Just to be sure, you are using the Studio version of Resolve?

Hi Frank, yes Studio version with Dongle.

no idea if it will help but if a driver needs to be re installed ? Anyway, doing nothing solves nothing:
- Download all update from windows update (windows anniversary update?) ,
- Download the latest version of the ATI drivers 480
- Download DDU (http://www.guru3d.com/files-tags/download-ddu.html)
- Make a full backup of the OS/HDD,
- Unzip DDU
- launch DDU and choose Safe Mode by restarting
- Once in safe mode, select ATI drivers and all clean
- Re start to end in normal mode
(DDU prevent automatic download of drivers for windows)
- Re install the ATI drivers + reboot
- Test the system and Davinci Resolve.

I can not help more, I am with Nvidia. Sorry

do you have in resolve settings some extra line that force to use opencl/Cuda and those lines cask for only one gpu?

also, if you look at the logs, does resolve call for the gpu three times?

The log says only 1 display GPU found
But it 'sees' 2x OpenCL boards

here is the log file:
https://www.dropbox.com/s/x0txehpq7wjuc ... e.log?dl=0

Just thought I'd mention updating to 12.5.2 and updating my amd drivers to 16.9.1 I can now see all my graphics cards in preferences

This is without display gpu for compute, when I switch it on I only see one gpu but as far as I know this is normal.

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Thanks for that John, I did not see the update. Will try that. Have to wait for new RAM to arrive first, as I returned the 2x 16GB and ordered 8x 16GB instead (different supplier).

There are also some new settings for the GPU. There's an option for Auto, OpenCL or CUDA, then if you choose either OpenCL or CUDA you can leave it as 'Auto' for the GPU or choose which GPU's to use

Thanks for that John, I did not see the update. Will try that. Have to wait for new RAM to arrive first, as I returned the 2x 16GB and ordered 8x 16GB instead (different supplier).

Hopefully it makes a difference! I should have done one by one to see which it was but was a bit rushed, sorry!


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There are also some new settings for the GPU. There's an option for Auto, OpenCL or CUDA, then if you choose either OpenCL or CUDA you can leave it as 'Auto' for the GPU or choose which GPU's to use

Excellent! Good to know !

There are also some new settings for the GPU. There's an option for Auto, OpenCL or CUDA, then if you choose either OpenCL or CUDA you can leave it as 'Auto' for the GPU or choose which GPU's to use

Excellent! Good to know !

It would be if I hadn't come across this problem

viewtopic.php?f=21&t=51721

Inevitably, it is better to wait ...