I have started testing Mavericks DP1 and installed it on spare USB drive.
Dual Xeon 5530
Nvidia GTX 570
From Mountain Lion installation I already know that this motherboard won't work properly W/O replacing AppleACPIPlatform and IOPCIFamily kexts (freezing etc.). So, I have installed as usual with -x, installation went smoothly, but when I replace those two kexts and reboot all my HDDs are missing.
In verbose mode I see that com.apple.driver.AHCIPort has failed to load because of some error ..... I suppose that we'll need updated AppleACPIPlatform and IOPCIFamily kexts for Mavericks?