With a closed case, the GPU was running 54-58 ...I don't remember the core. All fans are running. With the open case and (vintage) fan on it (see photo and smile). It started a couple of weeks ago. No moving, blowing out, anything. Installing something new...could have been, but I don't have a clue what. I scanned like crazy and it stopped, then started this again late last week. I didn't have anything serious running (AutoCAD, etc) when it happened. It seemed to be early in the morning the first times (it would start up and shut down several times and then work the rest of the day). I removed a Blue SnoBall microphone, thinking that was the last thing I connected, but it didn't help. The usage didn't go back up to 300,000 after that, but it's hanging at 196,000. Thanks much.