I figured that out through trial and error. What it does, if you enable it, I believe, is to make AMD SATA6G port 4 and 5, act like IDE ports. If you disable it, all six AMD SATA6G ports act as native SATA ports.
This is useful for putting your SATA DVD drive on port 4 or 5, and then enable SATA IDE combined mode, and then you can use boot discs that were programmed for IDE drives instead of SATA DVD drives.
The Marvell SATA6G ports are controlled by a seperate BIOS setting.
Neither one of those settings will have any effect on your HighPoint SATA card. You need to load the Windows drivers for that card, before any device on it can be detected in Windows.
Edit: I have that exact motherboard, the ASRock 990FX Extreme4, as does a friend of mine.
He mentioned a problem, if you connect an IDE HD to the onboard IDE port, and a SATA HD to an AMD SATA port, that you cannot boot the system for some reason. Something to do with boot options not being properly available. I don't know if he updated to the latest BIOS though. I've only ever had an IDE DVD drive connected to the IDE port, and that did work to boot from, even with a SATA HD.
I couldn't figure out how to enable HotPlug support though. With either the MS AHCI drives, or the AMD AHCI drivers, either way I couldn't get HDs plugged into my Rosewill Blackhawk's top SATA dock to show up in "Safely Remove Hardware", like I can with the same case and my Gigabyte P35-DS3R v1.0 with ICH9R.
Rig(s) not listed, because I change computers, like some people change their socks.
ATX is for poor people. And 'gamers.' - phucheneh
haswell is bulldozer... - aigomorla
"DON'T BUY INTEL, they will send secret signals down the internet, which
will considerably slow down your computer". - SOFTengCOMPelec
Last edited by VirtualLarry; 08-13-2012 at 09:01 PM.