Eu não tenho dual core, mas isso é um "bug" já conhecido em jogos, você tem que instalar os drivers se não me engano, você encontra eles no site da amd.
é bug sim, teve um topico sobre isso mes passado, o cara resolveu o problema com o driver mais recente da AMD
Que driver é esse?
eh esse aqui: http://www.amd.com/us-en/assets/content_type/utilities/amdcpusetup.exe(somente para AMD 64 Dual Core)
...e esse eh o "optimizer" do dual core: http://www.amd.com/us-en/assets/content_type/utilities/Setup.exe
FONTE: http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182_871_13118,00.html
PLEASE BACKUP YOUR REGISTRY FIRST!!
1 - Install the amd drivers, download it from here... http://www.amd.com/us-en/Processors/..._13118,00.html
2 - read this website and download the hotfix....READ here http://support.microsoft.com/?id=896256 ........Download here http://www.amdzone.com/files/WinXPdualcorehotfix.exe
3 - Edit your registry to enable the HOTFIX, follow these steps.
1. Click Start, click Run, type regedit in the Open box, and then click OK.
2. Right-click HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Session Manager, point to New, and then click Key.
3. Type Throttle for the new key name.
4. Right-click Throttle, point to New, and then click DWORD Value.
5. Type PerfEnablePackageIdle for the value name.
6. Right-click PerfEnablePackageIdle, and then click Modify.
7. In the Edit DWORD Value box, type 1. In the Value data box, make sure that Hexadecimal is selected, and then click OK.
8. 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....
5 - Install the NEW AMD Dual Core Optimizer.......from here.....http://www.amd.com/us-en/Processors/...1_9706,00.html
Your Boot.ini should look something like this now..............
[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
Finally your done, if anyone has any questions feel free to PM me.
(...)
1 - Uninstall the Hotfix, go into ad/remove programs, click on show updates and remove update numbered KB896256
2 - Reverse the registry entry.
3 - Uninstall the AMD drivers.
4 - Uninstall the AMD Dual Core Optimizer.
5 - Done.