For those curious we tested with a Phenom II X3 720 BE which does feature a fourth core and when we enabled ACC in the BIOS it did detect it and it worked great with the ASRock 1.01 BIOS. We're not sure how long this will work or what batch of processors have a fourth core but in our case it worked with this board and our CPU.

Another unique feature to this board is ASRock's instant boot which is basically an enhanced S3/S4 mode. After you shutdown the system reboots automatically and goes into suspend mode so you have basically a fresh running computer when you boot back up from suspend. Here's ASRock's chart on this.

Overclocking the HyperTransport bus we hit 2.3GHz stable which is a good overclock. We also overclocked the GPU of the 790GX and topped out around 900MHz which is pretty standard for this chipset.