[Ivan Pribicevic]

Hi everybody,

I’m happy to find this post cause it could be very interesting in many reasons for all low end Resolve concepts.

The thing is that some weird situation is happening. Just to underline one thing.We do have already some regular Resolve system working for almost year and half (MacPro/12Gb/Raid/HD Extreme 3D/FX4800…etc.).I must say we are perfectly happy with it. So we gave our best already in buying expensive stuff(not the 100K of course)

In the mean time I was experimenting with a lot of different low/high end motherboards for PC and with a lot’s of GPU’s at the same time using Intensity pro and Decklink Extreme 3 (not the 3D).

I got the same problem about frame rate with just turned Decklink cars for monitoring. Frame rate goes down to 17,18 Fps. When I turn of the Decklink this problem goes off. I even succeeded to put DUAL GTX560Ti to work together giving an incredible performance (almost 18-20 complex nodes working in real time spinning all of GPU fans to the maximum.). All of this goes down by just clicking the Video Monitoring ON (keep in mind that Intensity Pro and HD Extreme 3D have the same low frame rate). You end up by having just 17 Fps without a single one of nodes. Equals some bottleneck in communication between GUI and Framebuffer. This must be the issue. Correct me if I’m wrong

One thing more about this weird situation. If you put just one GTX560Ti with even the Intensity Pro (slowest possible card) you can work in realtime (30 Fps) perfectly (non listed/worst configuration in general). GTX560Ti is after all a very fast card even with a single GPU divided to a GUI and CUDA (it can work both ways :)… This particular non preferable PC configuration+Intensity Pro (around 1000Eur) works almost fast as a MacPro+HD Extreme 3D (around 4000 Eur). I excluded a RAID system in this observation of course. But to mention one SSD=250 Gb 500 Mb/sec works in real time as the more expensive at least 6 HDD in hardware RAID configuration. Space in Tb is an issue but for someone trying to learn the skills of color correction (The main idea of our guru Grant Petty) shouldn’t be a bottleneck. Let everyone who is talented be a part of this big change. 😉 So let’s give them a push.

So, how come that just turning on the Decklink in each one of these combinations except just one GPU lowers the performance so much. Much more than 10 nodes.

Some would say that the motherboard PCIe capacity is in stake having so many card on one place. I have tried 3 GPU System without Decklink and it works in full lane speeds (8for GUI, double 16 for GPU) equals many, many, many nodes in real time. So the motherboard is not a big issue. Specially not having a RAID card to suck some lanes (using 6Gb/sec SSD for benchmark).

One more thing. DPX is always slightly faster than ProRes and Red. Sucking some CPU or GPU? I must say that particulary Prores is not a big friend of Windows in general. But since the DPX is also affected by the same frame rate issue we shouldn’t mess up our minds.:) I’m trying to eliminate all of interesting soulutions for this if you don’t mind.

There must be some strange incompatibility between more than one Graphic card in the system and the Decklink cards. Some little thing is missing and I sure of it. It might came up that not all of the card are good for GUI…What about that? Read the post in the link down there.

I am absolutely sure that each of the preferable configurations will work, but is there some way to figure out why other configurations with very good spec. has this problem (more is less unless it’s in the book 🙂

Many thanks for anyone finding a energy to answer in this long forgotten thread :). To be honest I feel a bit free telling this to a metronome of minds. I am a big fan of Cow.

All the best,
Ivan