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I think IRAY on your GPU is 23 minutes and IRAY on your CPU is two hours. That is what I was talking about. There seems to be lots of misunderstanding taking place.
Wow, now you have me wondering. How do I discover whether it's rendering on the CPU or GPU?!
Well if your CPU usage is continuously 99-100% (look in Task Manager) while it is rendering, it must be using CPU.
Also the log file (from Help - Troubleshooting - View Log) will show whether it is using the GPU or has fallen back to CPU.
https://www.techpowerup.com/gpuz/
The render progress window will also tell you.
MelanieL, I looked at the log file after most renders. I get a bit lost. I saw where it said iRay rendering, but missed any references to using the CPU. But that's not surprising for me. My eyes are easily fatigued. scorpio, thanks for the link. I'll investigate it further, once I wake up!
I've redone some of my earlier renders, with spectacular results. All the renders are done within a few minutes. I'm not sure why. All the improvements happened after I moved the computer over to the large computer desk. I used a brand new HDMI cable. Perhaps the old cable wasn't inserted properly?! Also, I am using a 45" TV for a monitor now. The old setup had a 39" TV for a monitor. I don't think the monitor size affects the render performance. But I really appreciate the larger screen size.
First, check your render settings.
Render -> Advanced -> Uncheck CPU and check GPU (GeForce GTX 1660 in your case) and uncheck Allow CPU Fallback
After that any render that doesn't run on your GPU should fail completely.
Ken, thanks for the info. I followed your advice.
So anyway, CTRL-ALT-Delete doesn't restart the computer anymore. It brings up a menu. And one of the options in that menu is the Task Manager. And it has tabs for all kinds of things. One of those things is CPU usage. I like to click on the View menu and choose "Group by type".
OK, thanks
Also, once you get the "Performance" tab of the "Task Manager" visible, and select the "CPU" graph, then move your cursor onto the body of the CPU graph and right-click to get a short menu which lets you "Change Graph To" and select "Logical Processors" which will show all of your multiple CPU Threads separately instead of as single combined averaged value.