high revving

It revs up when i start my computer (fully start or from hibernation). Then gradually slows down to normal. But sometimes it stays a notch above normal. I know its not an heating issue cause same behaviour happened with earlier power supply hence i changed it; also it revs up at the start when...

I know colored coolant used to have a major problem of clogging both tubes and blocks, but is that still a thing in 2018 or can I comfortably put EKWB's red coolant in my $3250 PC's custom loop? First time making a custom loop so I don't really know anything other than the basics and that...