Everything runs smoothly.
Temp of my CPU (i7 4770k) = 55C-59C
Temp of my GPU (MSI GTX 770 twin frozr) = 61C-70C
Both without overclocking.

I only used MSI Afterburner to increased the Fan speed of the GPU to 70% and the temp is holding stable at 62C (default would be 42% at 71C).
Power of GPU = 60%
GPU use = 88%
All while 3 screens are connected.
27" at 1920x1080 on DVI port
24" at 1920x1200 on VGA port
22" at 1680x1050 on HDMI port (using a HAMA HDMI-VGA interface)

Running 2 projects. GPUGRID (1 task) and rosetta@home (7 tasks)

The system has been running non-stop between jan 31, 14:55 and feb 3, 16:54 and completed 7 long run tasks.

I've tried the default overclocking mode of my processor (4GHz in stead of 3.5GHz). The CPU fans and the case fans are running faster and of course a little more noise. and the CPU temp rised to 69C.

(I'm sorry that I've posted this in the wrong topic before)