[Lauri Laidna]

I understand that you are only using 1 GPU for both UI and GPU? From my experience when I only had one 1GB GTX285 installed, it did get slower and slower and slower. I think the memory (1GB) ran out. After restarting Resolve it was fast again for a while. With additional GPU for UI the same GTX285 does not show such problem.

I think this is your case also. So please use 2 GPU cards like suggeste by DaVinci.

Also try different output types (containers/codecs). Just did a test. Quicktime H264 got me 15fps, while Avid DNxHD 1080p 36 got 50-60fps rendering speed! Find your (or program) bottlenecks and try to avoid them. I hadn’t rendered out to H264 before from Resolve – this looks to be very slow and not optimized yet, CPUs were very little utilezed.

Have Task Manager runnig at all times and GPU-Z for GPU monitoring. This way you will see what is maxing out on your system.

[Lauri Laidna]

Sadly seems so. Render our to something else and then backround render those files into ProRes (on a Mac or a Virtual Machine running OS X). If there’s a lot of footage it might be wise…

[Lauri Laidna]

Start the rendering and then check cpu, gpu and hdd usage – and you’ll see where the slowdown is coming from.

For GPU usage download small free program called GPU-Z. You can open multiple instances of it to see all GPU-s side-by-side. Check for MEM and GPU USAGE. And for CPU/Disk use Windows’ own Task Manager and Resource Monitor.

I hope you have at least 2-way RAID0 setup. Also try taking media from one drive and rendering to another.

Hope these will help. I have no experience with ProRes on PC.

[Lauri Laidna]

Yes. All the grading, noise reduction etc is done by the GPU(s). Feeding the frames to Resolve including codec decoding is done by CPU. It depends on the task, what becomes your system’s bottleneck.

The good thing is that Resolve uses multi-core CPUs efficiently and has good performance on Windows.

The priority should be to be able to work realtime and with 1080p this isn’t a problem. And do you really need more than 2x realtime final render out performance? 🙂

[Lauri Laidna]

I’m getting around 35-50fps (DNxHD 1080p source and output) with different complexity grades on them. It’s basically up to 2x real time all the way. R3D Half Resolution Good quality debayer with grades on them I get above realtime without RedRocket. R3D debayering is done solely by the CPU if you don’t have RedRocket.

With only one GTX285 graphics card running both GPU+GUI I had some issues. The performance did go down after some work. I think the 1GB of memory ran out. After restartting Resolve it was up to speed again until it got slower again after some time. GPU memory usage was maxed out. So always go with 2 graphics card!

So I get enough performace out already. Next step for me would be to upgrade to GTX580. I don’t think you’d need multi-GPU solution when working with 1080p.

Windows Professional, GTX285 as GPU, GTX280 as GUI, 3930K @ 4.4GHz, 32GB RAM

[Lauri Laidna]

I see what you are wondering there. I tested the Zoom (under Color tab) quality with some regular 4K and 5K RED material. I zoomed in to get as close as 1:1 pixel ratio in Resolve (output 1080p) and then compared the image with 1:1 pixel ratio 4K and 5K images. The results were subjectivly very good. Sadly didn’t have any resolution chart material available. So I wouldn’t worry about the image quality, just use Zoom setting cause its so easy to use if you have mixed resolution material.

1080 devided by 854 equals 1,26463700234192 zoom factor. You can put it in as a zoom value.

PS. Let us know if you figure out better workflow to the problem.

[Lauri Laidna]

If you need something bigger then consider Samsung 2011 line of TVs. Anything higher than D6000 has 10-point white balance option! I’ve calibrated few of them and you can get them extremely accurate! The beauty is that you can calibrate them internally with a remote control in the menu. So you get accurate image from whatever video source – DVD, Camera, editing application which does not have LUT correction etc.

37″ doesn’t have Samsung panel, but smaller and bigger versions (UE32D6000 or higher, UE40D6000 or higher) do have.

I think this ise the best good-enough solution out there. Of course this is only REC709 colorspace, which is also quite accurate! I couldn’t imagine working with clients with only 22-24″ screen, so perfect thing for second screen for the clients. The only issue is some light bleeding from sides if you work in very dark room.

I think such solution beats low-end grading monitors, if you can’t afford LUT-based calibration or the monitor doesn’t have good integrated calibration.

[Lauri Laidna]

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

[Lauri Laidna]

Thanks! I totally missed that… Hope more codecs will follow soon for PC.

[Lauri Laidna]

Add the media directory to Resolve’s “Preferences” > “Media Storage Volumes” and then restart the app. Go to BROWSE and add all the media to Media Pool and only then Load the AAF. You can then uncheck the “Automatically import source clips into media pool”. After the AAF is loaded Resolve fins the media from Media Pool.

This seems to work better.