I’ve found that disabling VSync in games entirely and then letting MangoHud do the limiting works a bit better. Some of that will be because I’m using Proton on Linux, which has DXVK as a translation layer. Games will be trying to limit their frames the DirectX way, whereas MangoHud is limiting them the Vulkan way and is ‘closer to the monitor’ for keeping the pace right.

Also, MangoHud has an ability to set fps_limit in a per-game way that generally results in much smoother frame-pacing than most games achieve by default. That’s awesome for eg. Dark Souls / Elden Ring, which are stuttery at 60 fps but buttery at 59 for some reason, but also for random strategy games which would be just fine at 30 fps but instead have all the fans roaring to render at 144.

“Double it and add thirty” is accurate enough for ambient temperatures, and easier to do in your head. If you need scientific accuracy then you wouldn’t be using Fahrenheit anyway.