Very odd that increasing your resolution via dsr didn't help increase your gpu usage. Could you try testing the card in another computer?

Yea, something isn't connecting...
 
This is all I have in terms of computers (apart from some ancient ones). - But what could I look at in terms of hardware?
Or maybe something in the BIOS-settings?... I don't know what changed.
I got this card like a year ago. It was fine, then I didn't really use it for games for a while. Now that I get back into it, performance is lower.

Since you don't have another computer try running unigine heaven 4.0 on max settings for me and tell me if your gpu utilization ever reaches 99%. 

 
It does seem to it with that. - Just not sure if still the performance is as good as I benchmarked it last year.
What would be going on with some of the games I've been testing with?... Especially the Source Engine ones should be no problem.

Maybe it's time to reinstall windows? http://forums.evga.com/GT...PU-usage-m2243734.aspx

Could be. But it's not that easy because there's more than just games on this system.
 
But if it is known that reinstalling Windows has a big chance to fix something like this, can't the culprit in the system be found?
What gets "fixed" or re-appears in the system, by re-installing, that it makes it work correctly?... What automatically/unintentionally messes up over time?...
 

Good questions. Don't know as I've never had the problem myself.