You still need the hotfixes. It is a problem with the x2's and opterons. Here is what you need to do to install the drivers correctly.
1 - Install the amd drivers, download it from
here
2 - read this website and download the hotfix....READ
here ........Download
here
3 - Edit your registry to enable the HOTFIX, follow these steps.
a. Click Start, click Run, type regedit in the Open box, and then click OK.
b. Right-click HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Session Manager, point to New, and then click Key.
c. Type Throttle for the new key name.
d. Right-click Throttle, point to New, and then click DWORD Value.
e. Type PerfEnablePackageIdle for the value name.
f. Right-click PerfEnablePackageIdle, and then click Modify.
g. In the Edit DWORD Value box, type 1. In the Value data box, make sure that Hexadecimal is selected, and then click OK.
h. Quit Registry Editor.
4 - Make sure your BOOT.ini has this command in it, /usepmtimer to check, right click on My Computer go to properties, click on the ADVANCE tab, then under startup and recovery click on settings, then click on EDIT....make sure your boot.ini looks like this
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOW S
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect /usepmtimer