Superflower Platinum 850w. How hot?

[jamieboo]

Hello folks
Just breaking in my new x99 build and checking for teething problems.
I have a lovely Superflower Leadex Platinum 850w PSU, and I'm just wondering how hot it should get?
I'm certainly not overburdening it. It's a 5820K system with just one 770GTX.
I was playing Elite Dangerous just now for about an hour when I noticed some heat coming from the machine. I expected it to be either the CPU of GPU, but it was the PSU. Quite a bit of heat pouring out of it's back grill which was hot to touch.
I hadn't been looking at the PSU is a source of potential problems, but I'll be keeping an eye on it from now on.
Does that kind of temperature seem normal?

 

[jamieboo]

After testing further, I think I know what's going on here.
This PSU has a fan control switch. When set to 'Eco' - the default position - the fan doesn't spin at all unless a thermal threshold is hit. (I think around 55 degrees)
I think that's what happened here. I was gaming and the temperature was quietly building up but was basically contained within the unit. Suddenly the fan spins up pushing the accumulated hot air through the grill. I think that was sufficient to heat the grill and generally give the impression of suddenly high temperatures. Very soon after this the heat is dissipated and everything cools down, and then at a certain point the fan shuts off again.
I think that's what's going on.
Anyone else got a Superflower?