Here's what Asus has to say...
"Core i5-3570K (3.4G,L3:6M,iGPU,4C,77W,rev.E1)
If your motherboard BIOS version number is greater than the BIOS version listed above (801), then you will not need to flash your BIOS. However, if your BIOS version is smaller than the version listed above, then you will need to select and download the latest BIOS to update your system. We kindly remind you that there is a certain risk level involved in BIOS flashing, please refer to "BIOS Flashing Method". If you still have doubts, we will strongly advise you to consult with a PC Professional or your PC dealer for further assistance."
The latest version is 906 dated... 2012.03.30 update avaiable here http://www.asus.com/Motherboards/Intel_Socket_1155/SABE...
Hope that helps.... says it addresses stability issues and ram compatibility issues