Biostar

Due to Intel new release CPU(i5-2380P, i5-2450P and i5-2550K) do not have intergrate Graphic, please install a PCI-E VGA card to boot up system. 

For Windows XP user, please go to Control Panel > Add or remove program to uninstall BiosNotice.exe file.

For Windows Vista/7 users, please go to Control Panel > Program and Features to uninstall BiosNotice .exe file.

After next system boot up, BIOS Notice utility will be removed.

Due to VGA card design limitation, ATI Radeon 6xxx series VGA card cannot use DVI to D-Sub converter to use D-Sub monitor.

N68 series motherboard will not support AHCI function. It's due to chipset support limitation.

However, RAID function will support properly.

Please refer the detail information from AMD website for the VGA card support list.

http://sites.amd.com/us/game/technology/Pages/crossfirex.aspx

Due to AMD AM3+ specification, two cores combined in one module. So you will only see "Compute 0" and "Compute 1"  in BIOS menu. Each of them will control two CPU cores. 

Please insert VGA cards on two white slot PEX16_1 and PEX16_2 for support SLI function.

Please press Delete key in POST screen to go to CMOS setup.

Then go to Chipset> Low MMIO Align and set to 64MB.

It will help to release some memory space for the Windows XP and system should support to 3.0G memory size.

Yes, motherboard's HDMI port will support 5.1 channel audio output.

However, please be sure to use source disk (DVD/Blue Ray), media player and HMDI audio decoder with 5.1 channel support.

Yes, on-board SPDIF will be able to support 7.1 channel audio output.