You are mixing and matching.
Updating the bios won't hurt there are over 20 versions.
First you say Vista now you say XP.
Ata Mode vs AHCI mode is a different issue.
SSD server drives DIE VERY VERY SOON.
Not wanting to hear that XP and Vista Do not support SSD's without tweaks is another issue but it is not supported by Dell. This is not the 3rd party SSD server drive support forum.
The IDE Driver in all versions of windows is the DEFAULT Driver that comes with windows.
The AHCI Driver on the other hand is an F6 install driver.
There is also a "Fix" for windows 7 to enable the Driver and prevent the
STOP 0x0000007B INACCESSABLE_BOOT_DEVICE
http://support.microsoft.com/kb/922976
Fix this problem
Microsoft Fix it 50470
There are several BIOS updates for the Dell Optiplex 755 system.
http://downloads-us.dell.com/FOLDER00200504M/1/O755-A21.exe
The updates includes an AMT firmware and resolves security issues.
| A19 | 6/30/2011 3:47:09 AM |
| A16 | 1/20/2010 3:49:22 PM |
| A15 | 9/17/2009 10:58:37 PM |
| A14 | 6/24/2009 4:59:20 AM |
| A13 | 3/6/2009 4:01:14 AM |
| A09 | 3/27/2008 1:01:56 AM |
| A03 | 10/9/2007 1:20:55 PM |
| A01 | 9/7/2007 9:11:50 AM |
Intel's X25-M G2 disk loses data approximately 25% of the time when the disk loses power, even when the disk is instructed to flush its cache (write barriers on the ext4 file system), or with the write cache disabled. While disabling the cache doesn't solve the problem, it does make it more rare. With an error that occur's in the event log every few seconds a Drive can become toast in as little as a few hours.
Chipset - Driver
| Description | Importance | Version | Released | Supported OS | Download |
| Intel AMT SOL/ LMS, v.3.2.20.1049 PV, A02 SOL/LMS Driver 3.2.20.1049 PV w/ Win7 support | Recommended | 3.2.20.1049 PV | 1/22/2010 | Windows Vista 32-bit Windows 7 32-bit Windows 7 64-bit Windows XP Windows Vista 64-bit Windows XP x64 |  |
| Intel AMT HECI, v.3.2.20.1049 PV, A02 HECI Driver 3.2.20.1049 PV w/ Win7 support | Recommended | 3.2.20.1049 PV | 1/22/2010 | Windows 7 32-bit Windows Vista 64-bit Windows XP Windows 7 64-bit Windows Vista 32-bit Windows XP x64 | |
| Intel Chipset Software Installation Utility, v.8.3.0.1013, A21 Software support for Intel Chipsets. | Recommended | 8.3.0.1013 | 7/11/2008 | Windows Vista 64-bit Windows Vista 32-bit Windows XP Windows XP x64 | |