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22fps Limit with BMD UltraStudio SDI or Intensity Pro Enabled :(
This is a follow-up to my previous post at https://forums.creativecow.net/readpost/277/13226
One week ago I upgraded from the Intensity Pro (unsupported) to the UltraStudio SDI (supported) and I still cannot get > 22.5 fps as long as a BMD device is enabled in Resolve. This is the case even with no grades applied.
If I disable the BMD device in Resolve then I can get at least 30fps with full-green GPU bars without a problem even with fairly complex grades.
Only one of the BMD hardware devices has been installed in the machine at any one time. These results are the same whether Desktop Video v9 OR the drivers that ship with Resolve are installed.
I’m running Resolve Lite. Hardware specs are listed in my profile.
Is anyone using either of these BMD devices getting full FPS?
Tim
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12 Replies
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What is your GUI GPU and what slot speed is it running at? It needs to be Q600/Q4000 or better, and needs to be in a x16 PCI-E 2.0 slot.
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GUI GPU is a GTX 460
Resolve GPU is a GTX 570If I had an inferior GPU, wouldn’t that affect playback with and without the BMD hardware?
I only experience slow playback when the BMD interface is linked to Resolve.
Tim
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The load on the GUI card, and bus speed is significantly more when you are using video monitoring. I suspect your GUI card is not running at full x16 speed, and this is causing the issue.
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Both my nVidia cards are in 16x slots.
Is there a way I can check that they’re running optimally?
Tim
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Could you please give details on which motherboard you are using, which CPU, how much RAM, and which slots have which cards?
Some of the motherboards like the X79 chipset only support x16 speeds in a certain PCI-E configuration. When you start adding more cards, the bus drops to x8, etc.
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x8 is fast enough for even the most high-end graphics cards and games. x8 vs x16 shouldn’t be an issue at all with Resolve.
UltraStudio SDI is USB3.0 right? Maybe the problem is there. Might it be sharing bandwidth with something? Are you using integrated USB3.0 controller on PCI-E add-on card?
Download CPU-Z and check the memory usage and GPU usage of both graphics cards and your CPU usage. Maybe it tells you something.
just my 2 cents
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Hardware specs are at https://my.creativecow.net/Tim-Tyler/about
The UltraStudio SDI is the only device using the USB3 connections on my motherboard.
Tim
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What file types are you dealing with? DPX? ProRes? MXF?
Maybe try some different media types, might just be a bandwith issue over the USB 3 as previously mentioned.
Jack Jones
Freelance Nucoda/Baselight/DaVinci Colourist
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https://www.jackjonescolourist.com -
Thanks to the DaVinci support team for trying to solve this problem with me.
Unfortunately it appears as if my GPU’s just don’t have enough punch to monitor realtime 10-bit through the UltraStudio SDI.
The good news is that 8-bit monitoring works amazingly fast without dropped frames or GPU stress.
I did learn that Resolve uses the GUI GPU for image display and Decklink monitoring. I assumed the math was happening in my UltraStudio.
If installed, a separate CUDA GPU will be used by Resolve for node processing while the GUI GPU handles output monitoring.
FWIW – The GPU cards are the only cards in my system, and I rearranged them in every possible configuration using the x16 and x8 PCIe slots available on my motherboard. Resolve’s performance was unaffected with any of the configurations.
Tim
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I guess this is the down side on pc and win version as the system is more heavy and
there can be really big mess really fast as users can make custom system
that will give problems.I urge everyone to follow config guide to get consistent results.
I have seen that on capture cards, people put together
god knows what in machine and then nothing works.So there is a reason for config guide 🙂
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Margus
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