I have a Thinkpad X1 Extreme laptop with 64GB RAM, I7 CPU and a Nvidia 3070 TI GPU. When I start Rhino 7/8 WIP the temperature of the GPU goes 10 C up just by having Rhino open. There is no rendering, no shading no modelling.
When I open Blender the GPU temperature reacts when rendering or shading models. Else the GPU temperature doesn’t rise. For me this seems to be some kind of (mis)use of the GPU that makes it compute something though it isn’t necessary because nothing is visible happening on the screen. The strange thing is that the GPU doesn’t seem to compute anything or allocate extra memory when Rhino is started. The temperature just goes up and the GPU-fan spins much faster.
I also have a laptop with a a Nvidia 3070 TI GPU which behaves similarly. When I start Rhino 7 but do nothing in Rhino the GPU temperature initially goes up by about 5 degrees, and then reaches an increase of 10 degrees. This is both the overall GPU and “Hot Spot” temperatures as reported by HWMonitor.
Ok now I’m positive that this is a Rhino problem. I spoke with a chat supporter from Nvidia that checked the GPU-log and couldn’t find anything wrong with the card. I had to install a very handy utility called GPU-Z which has a lot of information about the GPU besides the temperature.
I compared Rhino to Blender and from what I could see Rhino is handling the GPU as if Rhino needed full ressources from it all the time.
In the moment I open Rhino the clock and memory allocation goes from 210 Mhz and 101 Mhz to 1000 and 1600 where it stays.
In Blender when ever using the Viewport to orbit or model or change something the clock speed rises a bit depending on what you are doing but in the moment you release the mouse and stop viewing and changing things the clock speed goes back to 210 Mhz and 101 Mhz as you would expect since the GPU should ony be called and ressources allocated when there’s need for it.
Are you using a custom startup template? If so, does the problem go away if you assign no template at start up?
When you open Rhino and you see the temperature and GPU usage go up, can you you please open Windows task manager, find the Rhino process in the list, right click and choose ‘Create dump file’ The file will be enormous. Please zip and upload to Rhino - Upload to Support to my attention.
This is on Windows, correct?
When you launch Rhino and see the viewports appear, a template has been loaded - even if nothing is specified in the options.
In your Rhino Options -> Files settings, what does it say for default template?