Your idle temperatures seem perfectly normal for an RTX 4080. Mine typically idles around 47°C, and that's with a decent case airflow setup. The RTX 4080 is designed to handle higher temperatures due to its performance capabilities.

Don't forget that these GPUs are built with thermal limits in mind. NVIDIA sets the maximum safe operating temperatures, and as long as you're well below those (usually around 83°C to 85°C under load), idle temps in the 45°C to 55°C range are fine.

If you're still concerned, you could:

• Check Fan Settings: Sometimes adjusting the fan curve to be a bit more aggressive at lower temperatures can help reduce idle temps.
• Ensure Proper Ventilation: Make sure your case isn't tucked away in a confined space, and that there's enough room for heat to dissipate.
• Monitor Software: Keep an eye on any software that might be using the GPU in the background, like certain browsers or applications.

But overall, sounds like your system is running just as it should!

A good idle temperature range for most GPUs is 30-50°C. Anything under 60°C is generally considered normal during idle conditions. Some key things to keep in mind:

• Idle temperature can vary depending on factors like your GPU model, case airflow, ambient temperature, etc. What's important is the difference between idle temp and load temp.

• Pay attention to sudden spikes or changes in idle temp rather than the specific number. A 20°C jump could indicate an airflow or fan issue.

• Lower idle temperatures are better, but don't worry unless your GPU starts exceeding 60-70°C at idle or shows a drastic rise over its usual baseline temp.

• Newer GPUs also tend to run slightly hotter than older ones, even at idle. This is because they have higher power draws and tighter transistor densities.

So in summary, 30-50°C is a reasonable target, but focus more on relative changes and load temps rather than chasing a particular idle number. Keep an eye out for unusual spikes!

Idle temps around 35-45°C are typically considered normal. If you're seeing temperatures much higher than that at idle, you might want to check your case airflow or GPU fan settings.

My RTX 3080 idles around 38-42°C with decent airflow, which is perfectly fine. Anything under 50°C at idle shouldn't be a concern. What matters more is your load temperatures during gaming or rendering.