This bios was discovered by someone on abxzone.com. Myself and a few others have installed it with no issues. It appears to fix's Speed Step, overvolting in bios and provides more DRAM multiplier options. Also, the splash screen is that of the AiLife box cover.

Don't know if this is a beta bios or final but it appears to work fine.

ftp://ftp.downloadbase.de/p5wd2_0408.zip

ps. I loaded the Bios update using the Windows Asus Update program