My motherboard is an Asus M3N-H/HDMI BIOS Revision 2603. I bought a huge Scythe Ninja 3 cooler. RAM is DDR2-667 BIOS configuration:
After booting with this configurations I was able to enable CoolnQuiet and C1E, and this still works. Tested with Prime no crashes (run for hours). This configuration gives stable 3600Mhz speed to an originally 3000MHz processor. With this I can play Mario Kart wii with dolphin.