Originally Posted by ThomasMW
I do not want to clutter up this thread, but since I am new to overclocking I would like to ask you a few questions.
I think I have successfully overclocked my i7-8700k to 4.7GHz.
MB: Asrock Z370 Taichi
Turbo 4.7 settings
CPU cache ratio 37
AVX offset ratio 2
fixed voltage @ 1.210
LLC - level 2
Someone told me to use offset voltage instead of fixed, but due to my habit I always run Windows with High Performance mode and therefore it seems I would not benefit from offset mode at all.
The questions are:
1. Is it bad for CPU to run Windows with High Performance mode 24/7?
2. Is it bad for CPU to run with fixed voltage 24/7 assuming the temperature and voltage is within safe ranges (e.g. not above 80°C under 100% load and up to 1.350)?
The offset is whats referred to as adaptive voltage or sometimes called offset. It can help you find a better balance of voltage with the built-in voltage regulator of the CPU. The offset can help you manually tune a voltage to be exactly in the area of where you want to be. If for example you know 1.25 is good, you can use an offset + or - to add or subtract voltage from what your CPU determines. This can help with lower voltages on idle and allow more when you need it on load. In simple terms, it takes your auto voltage and allows you to offset it + or -.
To answer your questions, it is fine to use high performance 24/7 as long as you are not above 80 deg Celsius, in my opinion, others may argue more. On the 8700K don't go above 1.35 and don't do 1.4 unless you have exotic custom cooling. 1.4 is the absolute limit. So as long as you have a safe stable overclock and voltage, high-performance power plan just means it will run at your overclock settings all the time. 4.7 GHz 24/7 for your example.
A fixed voltage is fine and means your CPU runs at that voltage no matter what load or idle conditions your CPU uses. That is why most people use CPU C-States. It can help reduce the load on your CPU when it's not necessary. That is why adaptive voltage or offset is good because it helps lower the voltage when idle. Lot of things to consider with a static voltage like VDROOP though.LLC Level 2 is a good start on ASRock boards.
Simple answer, it is fine to use static voltage 24/7, just keep an eye on temperatures, and while it does degrade the lifespan of your CPU to use more voltage, it should be fine 24/7 with adequate cooling. I would also enable C-States to help lower CPU speed when idle. If you use static or fixed voltage, just know your CPU stays at or around that number depending on your LLC. If you want lower voltage when idle, you need to use offset or adaptive.