First,changing IDE->ahci
Seems its a little different for windows 8
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It is slightly different in Windows 8:
Exit all applications
Go to the start screen and type in regedit.
If you see the UAC (User Account Control) dialogue box, just click continue.
Locate the the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\storahci\startoverride
In the right pane, right-click Start in the Name column, and then click Modify.
In the Value data box, type 0, and then click OK.
On the File menu, click Exit to close Registry Editor.
Restart and enable AHCI in your system BIOS
I followed these steps and got endless reboots in my Windows 8 partition only I had to get into recovery mode and do a full reset.
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Found this:
http://answers.microsoft.com/en-us/windows/forum/windows_8-performance/how-to-change-sata-config-from-ide-to-achi-in-win/1cb3350f-22ff-4775-969e-876e1fd5c4ed
http://superuser.com/questions/471102/change-from-ide-to-ahci-after-installing-windows-8
On Scores
1) 450 -> low 500s is about right if on a SATA II Intel Port.
2) On Intel Sata III port the M4 and Samsung 830 overall score is low to mid 700s
3) Reference the Marvel sata III controller for older Intel systems - don't bother, it is NOT much (if any) better for a SATA III SSD. at least Intel has updated drivers.
NOTE: I have M4, Samsung 830s, samsung 840 Pro and (Ugh) Agility III (traded one of my agility IIIs even up for a Samsung 840 Pro).
For my i5-750 which has Intel sata II and a marvel controller for SATA III. I just use a SATA II 120 Gig Pheonix Pro (OS) + and Intel G2 for Some data(files) I most often use.