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Guys, something's been bothering me

Why does my hardware (I can't tell if CPU or GPU) go crazy when playing some DOSbox games? What I mean is that the fans start spinning a whole lot, some heat gets bulit up too, but the task manager doesn't show any spikes in usage, the crazy spinning stops as soon as I switch to a different window, and it apparently isn't a matter of what's being shown on the screen as you can see the game window in the background but no spinning is happening. And it sure as heck is no hardware demanding game. Also happens only to some games. No viruses, legit games from GOG.

Same thing also happens with some older Windows games, like the original Shogun. Too much noise, spinning, and heat for an oldie game. Why is this happening? Is it because the computer gets confused over overpowered GPU or too many CPU cores when running a thing that is so old it didn't count for this?

It doesn't happen with new games that are made for new computers, like I had no unnecessary heat/spinning/noise when playing Due Sex: Mankind Divided for example, or Witcher 3.

What I mean like starting up Mission Critical, a fairly old adventure game running on DOSbox, and the fans go crazy. Some unusual fan spinning activity in Stonekeep too, but not like non stop spinning that happens with Mission Critical. No usage spikes etc. and when I switch to a different window the spinning stops. Also, crazy spinning with Life is Strange even though it's just ye olde Unreal engine and turning Vsync on does nothing (turning on Vsync helped with a lot of new games in which GPU decided to go all in unless Vsync told it to chill).

Can it also be part to stretching those oldie resolution games into wide screen monitor fullscreen? Since I don't know much about computers, I really have no idea, but I'd prefer my hardware not overact too much because I'd like it to last at least some years. And I'd especially prefer that it doesn't overact when it doesn't really do anything (running a dosbox game or generally something not demanding with no high usage as seen in task manager usage graphs).

If it's old dosbox games getting confused about multiple CPU cores or something, what can I do about it?
Post edited January 26, 2020 by XYCat
My guess:
(I don't know why that's the case for you) These old games are using all processing power to render as many fps as possible.
Try limiting fps to 60 fps (or your monitor's refresh rate) in you GPU control panel... pick DOSBox, and other problematic games and enable VSync.
I know how to do that for my Nvidia card, but you haven't mentioned any of your specifications.