Hi, I have a similar problem with the same board:
OS X 10.7.3 Lion
ASUS Sabertooth P67 Rev.3
Intel Core i7-2600K
8 GB Corsair DDR3 1600
Sapphire Radeon HD 5870 Vapor-X OC Rev. 2
Crucial M4 256GB SATA-600
Bios 2103 with sleep hex edit
SpeedStepper AICPUPM patch
No NullCPUPowerManagement.kext
DSDT with just HDMI-Audio edit
So my Hack goes into sleep and wakes up, and the whole machine is freezing instantly so I can see the desktop but nothing is working.
Any help is highly appreciated.
DSDT.aml.zip