Finally I made myself to write this relation of my build. (It's really a challenge for me to write in English.)
Well, I couldn't wait any longer for that Xigmatek cooler and ordered a Scythe Ninja plus instead.
So I applied MX-2 paste using the "line method", recommended by Arctic Cooling for quads. I had to mount the cooler two times because at first it was wrongly oriented. The fan is mounted vertically and it blows air through the heatsink towards the rear exhaust fan. And the cooler is rather big: the fan overhangs the ram slots and actually rests on one memory stick. So if I had bought Ballistix tracers or OCZ Reapers I wouldn't be able to mount the fan vertically.
After installing the CPU and cooler and memory, I put the motherboard into the case and screwed it in. Then I installed the PSU and realized that there is no way to connect the 12V power connector to the mobo! There was no room for fingers because of that big Ninja. I had to unscrew the mobo, take it a little away of the top of the case, plug the connector and screw it back.
Then I installed the graphics card and connected all the cables. I must say that CM 690 is a really nice case and cable management was a real fun to do. I'm a complete beginner and yet I managed to do it pretty neatly IMHO. Sorry, I don't have a camera so I can't provide any pictures.
With beating heart I pushed the power button. Nothing. Blank screen. The fans were spinning but there was apparently no video signal. I turned it off and on two or three times with no result. And then accidentally I pushed the reset button. And what do you say - the monitor lighted up and I saw my board doing the POST! But then, after turning is off and on again it's the same. No video until I hit reset button. Very strange. After a while it turned out that the graphics card was not fully seated in the slot. Don't know how it could happen, I was very careful installing it.
Then I put the hard drives and DVD in without further problems. The whole thing took me some 12 hours and it was fun.
Here are the screenshots with temps:
First when the system was idle:
And running prime95's Small FFT (four threads):
What do you think, are those good temps? The ambient temperature was 23C (73F).
Also, there is a problem with one of the hard drives. It works fine but very often, maybe even most of the time there can be heard some tapping noise at regular intervals of about half a second. When I touch the drive then I can feel the shocks. Do you think I should try to RMA it?