Compressor 3 + 8Core Mac Pro + Frame controls = Do your encoding overnight?

So as many others have mentioned here mysteriously a g5 can often times outperform an 8 core intel mac on certain compression jobs. I have figured out something which some of you may want to confirm but it appears very interesting to me the culprit appears to be frame controls.
Heres how came to this conclusion:
Took a DP G5 Power Mac and a 8core Mac Pro, put the same source movie on both machines and ran a standard apple setting on them (h.264 800K for download), results Mac Pro is about 5x faster then the Power Mac. Next step turn frame controls on (no adjustments just turn them on). Thats it, now the Power Mac is about 2x faster then the Mac Pro so what i make of this?
Sounds like apple needs to come out with a software update.

so have some more information for any of you who are interested. the real culprit seems to be the adaptive details enabling this option makes my encodings on the macpro go approximately 20x slower. For comparison the power mac only slows down by a factor of 3 (for reference the macpro is a 2x4x3 Ghz w/ 9G Ram, the G5 is a 2x2.7 Ghz w/ 2.5 G Ram).
Some strange facts:
Negating the effects of the adaptive details option, even though the mac pro should theoretically be at least 4.4 times as fast for encoding processes, the fastest i have been able to achieve in compressor without the use of virtual clustering is 3.5 times as fast, the slowest was a mere 20 percent faster. with virtual clustering and segmenting on the range i have for compressor performance is 94 percent G5 speed on the slow end and 6x on the fast end.

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    Connection Speed: Unknown
    Unknown Device:
    Manufacturer: Unknown
    Model: Unknown
    Maximum Speed: Up to 400 Mb/sec
    Connection Speed: Unknown
    Unknown Device:
    Manufacturer: Unknown
    Model: Unknown
    Maximum Speed: Up to 400 Mb/sec
    Connection Speed: Unknown
    Unknown Device:
    Manufacturer: Unknown
    Model: Unknown
    Maximum Speed: Up to 800 Mb/sec
    Connection Speed: Unknown
    Unknown Device:
    Manufacturer: Unknown
    Model: Unknown
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    Connection Speed: Unknown
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    Please do things right before updating OS X in order to avoid problems.
    A. Repair Hard Drive and Permissions
    Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger and Leopard.) After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now restart normally.
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    B. Clone Using Restore Option of Disk Utility
    1. Open Disk Utility from the Utilities folder.
    2. Select the destination volume from the left side list.
    3. Click on the Erase tab in the DU main window. Set the format type to Mac OS Extended (journaled, if available) and click on the Erase button. This step can be skipped if the destination has already been freshly erased.
    4. Click on the Restore tab in the DU main window.
    5. Select the destination volume from the left side list and drag it to the Destination entry field.
    6. Select the source volume from the left side list and drag it to the Source entry field.
    7. Double-check you got it right, then click on the Restore button.
    Destination means your backup drive (should be erased first.)
    Source means your startup drive or volume.
    C. Download the Standalone Combo Updater from Apple.
    Be sure you quit all running applications and disconnect all peripherals (except original keyboard and mouse) before running the installer. When the installer is running do not use the computer in any way other than to respond to an installer dialog.
    Install the update by double-clicking on the installer package icon. When the installation is completed Restart the computer. Your computer will boot twice - this is normal. Upon completion of the update use Disk Utility to repair permissions. Not all permissions will seem repaired. You will get spurious reports regarding permissions related to iTunes, Front Row. These can be ignored. They will appear every time you repair permissions.
    Following these basic steps should prevent most if not all updating problems. Note that if you have unrepairable disk problems reported in Step A then DO NOT update your system until those problems are resolved.
    If you find that you did not follow these suggestions, then you might consider reinstalling OS X and going about the process properly in the hope of a successful result:
    How to Perform an Archive and Install
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    1. Be sure to use Disk Utility first to repair the disk before performing the Archive and Install.
    Repairing the Hard Drive and Permissions
    Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger.) After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported, then quit DU and return to the installer.
    2. Do not proceed with an Archive and Install if DU reports errors it cannot fix. In that case use Disk Warrior and/or TechTool Pro to repair the hard drive. If neither can repair the drive, then you will have to erase the drive and reinstall from scratch.
    3. Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When you reach the screen to select a destination drive click once on the destination drive then click on the Option button. Select the Archive and Install option. You have an option to preserve users and network preferences. Only select this option if you are sure you have no corrupted files in your user accounts. Otherwise leave this option unchecked. Click on the OK button and continue with the OS X Installation.
    4. Upon completion of the Archive and Install you will have a Previous System Folder in the root directory. You should retain the PSF until you are sure you do not need to manually transfer any items from the PSF to your newly installed system.
    5. After moving any items you want to keep from the PSF you should delete it. You can back it up if you prefer, but you must delete it from the hard drive.
    6. You can now download a Combo Updater directly from Apple's download site to update your new system to the desired version as well as install any security or other updates. You can also do this using Software Update.

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