Crashing: GTX1080 vs Titan Xp vs Vega 64 Frontier Edition

I want to tell you guys about something that surprised me... In a nutshell, it's that Resolve seems to run more reliably for me when using a Radeon Vega 64 Frontier Edition GPU. I'll explain.

Since Version 14 was released, I've been having issues with Resolve crashing very frequently. Way too often. I didn't have this problem with ver. 14 Beta though. Just each version of the full release. I think that was my first experience with a beta version of anything being more reliable than the final release. Anywho...

I was originally running an Asus Turbo GTX1080 8GB GPU. I figured the problem could be that I didn't have enough VRAM so I bought a Radeon Vega 64 Frontier Edition card simply because it's chock full of VRAM -- 16GB of it. Problem Solved. Resolve didn't crash at all and once I played with the drivers for a bit, it seemed that the Vega was providing roughly the same performance as my GTX1080. I can accept that.

But then I got curious... Was the problem actually the amount of VRAM I had or was it an issue with the NVIDIA card vs. the Radeon card? Or both? In order to satisfy my curiosity I ordered a new Titan Xp with 12GB of VRAM to see if it would be as stable as the Vega. Guess what? It crashes too.

So my next question is: is the 12GB of VRAM on board the Titan Xp simply still not enough for a stable Resolve or is it something to do with the NVIDIA card/drivers? Would twin Titans totaling 24GB VRAM solve the problem? Someone weigh in, because I don't think I can spend another 1200.00 on a second Titan just to test my updated theory...

My system:

Intel 6900K 8-core
32GB RAM
Titan Xp 12GB

System Info 2.PNG (56.59 KiB) Viewed 2469 times

System Info.PNG (72.39 KiB) Viewed 2469 times

Adding a second Titan will not increase your VRAM, it is not additive. 12GB should be plenty comfortable for UHD work, so unless you're doing some insane stuff, my guess is that you have a driver issue, or other system issue. Try using DDU to uninstall your display drivers, and install the latest Nvidia release.

I blew away the Nvidia drivers when I installed the Vega, so when the Titan went in, it also got a fresh install of the latest drivers. I'm wondering is anyone else is having this problem and not realizing that it could be a GPU issue.

So if the VRAM isn't additive, then how does Resolve split up the work if you have two GPUs installed? I didn't realize that was the case.

Adding a second Titan will not increase your VRAM, it is not additive. 12GB should be plenty comfortable for UHD work, so unless you're doing some insane stuff, my guess is that you have a driver issue, or other system issue. Try using DDU to uninstall your display drivers, and install the latest Nvidia release.

So if the VRAM isn't additive, then how does Resolve split up the work if you have two GPUs installed? I didn't realize that was the case.

Same data is stored in VRAM of both cards and processed, as far as I understand. There is not a fast enough connection between the two cards to pool the VRAM effectively. Nvidia has NVLink on their (super expensive) niche products for this purpose, but I believe it requires implementation in software to be used.

[Peter Chamberlain]

I blew away the Nvidia drivers when I installed the Vega, so when the Titan went in, it also got a fresh install of the latest drivers. I'm wondering is anyone else is having this problem and not realizing that it could be a GPU issue.

So if the VRAM isn't additive, then how does Resolve split up the work if you have two GPUs installed? I didn't realize that was the case.

Adding a second Titan will not increase your VRAM, it is not additive. 12GB should be plenty comfortable for UHD work, so unless you're doing some insane stuff, my guess is that you have a driver issue, or other system issue. Try using DDU to uninstall your display drivers, and install the latest Nvidia release.

You need to have the correct CUDA and Nvidia drivers for the card installed. We get good and reliable performance from the Xp so its a setup issue you have.

Resolve accesses the GPUs at a much deeper level than most apps and was written for multiple GPU operation 10 years ago with consistent performance updates over the years. The GPU memory is fully used on each GPU separately and so there are no shared resources.

Peter-- Can you please let me know which version of the Titan Xp drivers you are running? I'm running the latest version (currently 390.77) but I've been having the same problem with every version, and each Nvidia card I've tried (Titan Xp & GTX1080) since ver. 14 came out of beta. I'm only aware of one set of drivers for the Titan Xp, so if there are some others that I should try please let me know. I should reiterate that when I swap out the Titan Xp for the Vega64 FE (running "gaming" set, not "pro" set of drivers -- gaming drivers run faster in Resolve), the problem goes away completely and Resolve is rock solid. With the Nvidia cards installed, I literally have to save after everything I do in Resolve, because it's going to crash. Any idea what else I can try to make it stable?

Best,

D

I blew away the Nvidia drivers when I installed the Vega, so when the Titan went in, it also got a fresh install of the latest drivers. I'm wondering is anyone else is having this problem and not realizing that it could be a GPU issue.

So if the VRAM isn't additive, then how does Resolve split up the work if you have two GPUs installed? I didn't realize that was the case.

Adding a second Titan will not increase your VRAM, it is not additive. 12GB should be plenty comfortable for UHD work, so unless you're doing some insane stuff, my guess is that you have a driver issue, or other system issue. Try using DDU to uninstall your display drivers, and install the latest Nvidia release.

You need to have the correct CUDA and Nvidia drivers for the card installed. We get good and reliable performance from the Xp so its a setup issue you have.

Resolve accesses the GPUs at a much deeper level than most apps and was written for multiple GPU operation 10 years ago with consistent performance updates over the years. The GPU memory is fully used on each GPU separately and so there are no shared resources.

One thing I would suggest is checking your motherboard's user guide and be sure that you are installing the video card into the correct slot. I was having problems with my system and realized that I had installed my card in the wrong slot (I read the mobo's manual incorrectly). Once I moved it, the problem went away.

Just an idea.

Also, can you post a link to Resolve crash logs?

The card is indeed installed into the correct slot, which in this case is #1 16x. Status in BIOS confirms running in 16x mode.

I'll try to post a crash log in a few minutes.

D

One thing I would suggest is checking your motherboard's user guide and be sure that you are installing the video card into the correct slot. I was having problems with my system and realized that I had installed my card in the wrong slot (I read the mobo's manual incorrectly). Once I moved it, the problem went away.

Just an idea.

Also, can you post a link to Resolve crash logs?

Here is a link to logs that I just generated. Not sure if this is what is needed?

https://www.dropbox.com/s/8wje6rwutyjw5 ... 7.zip?dl=0

Have your tried explicitly setting Resolve to use CUDA by going into DaVinci Resolve... Preferences... Hardware Configuration... System and changing the GPU processing mode from Auto to CUDA?

Yes, it's on manual setting.

Have your tried explicitly setting Resolve to use CUDA by going into DaVinci Resolve... Preferences... Hardware Configuration... System and changing the GPU processing mode from Auto to CUDA?