Upgraded CPU cooler is this normal?

[Dave85]

So my stock I5 heatsink died and upon taking it off I found there must have been an air bubble or something and it the paste only smudged at one side so must have been making rubbish contact. That might explain the idle temp of 48c and gaming temp of 70c

However I picked up a replacement from purple shirts as it was urgent I was surprised to find a decent cooler the ARCTIC COOLING Freezer 7 Pro Rev.2 CPU Cooler - 92mm

Idle now 26 to 30c and gaming under 50c so much better but whats worrying me is that on boot after being off for a good 5 hours it wont even start the cpu fan according to the bios and Asus AI Suite its 0RPM but when I open the case its clearly spinning and the temperature is only 2 or 3 degrees ambient. It does appear to start up the fan as the temperature increases and usually sits around 600 to 800 rpm just freaks me out on startup.

Is that sort of behavior normal when using the mobo to control to the temperatures etc fan profile is set to standard or does it sound like a faulty fan not sending the signal to mobo

 

[SeraphX]

It's perfectly normal IMO, I didn't have that with my Freezer 7 pro, but did with a Silver Arrow and a Thermolabs Baram

 

[IC3]

Did you plug it to correct socket? I had same issue

 

[Dave85]

After mucking about with it think it has something to do with the Asus Fan Expert as part of AI Suite 2 the profile set to standard puts the fan off until the cpu temperature is above 35C as this cooler is so good compared to stock it idles at 26C for a good 5 minutes with the fan spinning at what appears to be about 10% but obviously to low for the mobo to pick up the rpm.

Going to uninstall it so its the motherboard and qfan that decides on the speed and will see if that sorts it.