Quietly and efficiently; but beware!

I operate the power supply in my gaming pc from a GTX690 dual GPU card, an ASUS Z97 motherboard, an Intel processor and I7-4790k multiple disks is. My old 750W PSU came to its limits here.
The Corsair RM1000 manages the loading and playing is still comparatively quiet.
The fan in the power supply to function only in case of need brings me to this point, however, no benefits. My graphics card is generally quite warm and the other fan in the housing have to compensate for the lack of air circulation of the power supply fan.
This is my PC a total of about as loud as my old PSU, ran the fan permanently.
But for me it does not matter, and the point can not be attributed also to the power supply.

Very Important:
my old PSU was indeed from another manufacturer, but also modular and I wanted to take over the old power cord set. This can lead to problems. After I connected everything, the PC did not turn only. It shone only one onboard control LED; that was it but also already. In my case the problem was due to the cable, which also supplies the CPU. It was only when I was using the cable supplied by Corsair, the PC was on. Although the connectors of modular power supplies are standardized uniform, the occupation may differ apparently. Therefore, the urgent recommendation: Although it initially might mean a bit more work, not take the old power cable, but uses the new, the power supply unit supplied (especially in the power supply for board and processor).
Since I did that, everything runs smoothly.

mfg
Sven