AFAIK the "dual core optimizer" is not meant to be installed on Opteron based systems. It's just for Athlon X2 based systems.
If you check the AMD website for OPTERON drivers:
(The links under "AMD Opteron Processor") You won't find the "dual core optimizer".
PLEASE read the annotations for the drivers before you install everything you can find just because someone said so.
AMD Athlontm 64 X2 Dual Core Processor Utilities & Updates
AMD Dual-Core Optimizer - The AMD Dual-Core Optimizer can help improve some PC gaming video performance by compensating for those applications that bypass the Windows API for timing by directly using the RDTSC (Read Time Stamp Counter) instruction. Applications that rely on RDTSC do not benefit from the logic in the operating system to properly account for the affect of power management mechanisms on the rate at which a processor core's Time Stamp Counter (TSC) is incremented. The AMD Dual-Core Optimizer helps to correct the resulting video performance effects or other incorrect timing effects that these applications may experience on dual-core processor systems, by periodically adjusting the core time-stamp-counters, so that they are synchronized.
AMD Athlontm 64 X2 Dual Core Processor Driver for Windows XP and Windows Server 2003 Version (x86 and x64 exe) 220.127.116.11 - Allows the system to automatically adjust the CPU speed, voltage and power combination that match the instantaneous user performance need. Download this Setup Installation program (EXE) to automatically update all the files necessary for installation. This package is recommended for users whom desire a graphical user interface for installation. This .EXE driver is a user friendly localized software installation of the driver designed for end-users. This driver supports AMD Athlontm 64 X2 Dual Core processors on Windows XP SP2, Windows 2003 SP1 x84 and x64 Editions.
Just some sections taken from www.amd.com with copy&paste to think about.
Ghostrider·CPUs - 2*Opteron 246
·Mainboard - Tyan Thunder K8W S2885ANRF
·RAM - 4*Corsair TwinX1024RE-3200LL (4GB, 8*512MB, DDR400, 2-3-2)
·Graphics - HIS IceQ-II X800Pro
·HDD - Western Digital Raptor WD740GD, 74GB, 10k
·RAID - 3Ware 7850, 64bit PCI, 8chn hardware RAID
·RAID-HDDs - 5*WD800JB
·Optical - 1*SlimSize CD-ROM; 1*NEC7441 DVD-RW
·Sound - Creative SoundBlaster X-Fi Elite Pro
06:56 PM by