Realtek 898 (on asus rampage iv extreme) NO SOUND #iATKOS #ML2

hello,







i installed os x 10.8.4 with your help on my pc...thanks for that,







but now there are some little problems and i dont know how to fix it...







the first and biggest problem is...whatever i do i cant get no sound from the realtek 898 soundchip on my motherboard...and all the programs (iTunes, quicktime, youtube etc...) dont play anything...







i can press on "play" but the timer is not running...the only way to get some sound is my usb wireless headset and then ONLY by quicktime...if i change the sound output it stops and sometimes crash for a moment...







kext for the soundchip is installed and S/L/E is repared and new cache (kext wizard)...but what else i have to do ??











the next is....i only can boot with "GraphicsEnabler=No" how can i fix this ?? or doas this make no disadvantages ??







the system know my nvidia gtx 660...











and last is about my cpu...in systeminfo-details there is my i7 3930k with all 6 cores but in "about this mac" ther is only 3,2 GHZ Unknown" is that normal ??











(sry for my bad english)







thanks for your help !!