Vista interfering with MacOSX graphics via BootCamp

Question

I'm new to the MacOSX platform and love it. Won't be going back to regular PC hardware unless absolutely necessary.
I have the newest fully loaded iMac (3.06Ghz, 4GB Ram, 8800GS video) and I'm having an issue with running Vista under bootcamp when rebooting back to OSX. Every time I'm in Vista, then reboot in OSX, the graphics seemed to be under-clocked in OSX. Its seems to be rendering at a power saver setting speed, so games and effects within OSX are slower (by as much as 75%).
My assumption is that Vista's power settings profile is forcing the GPU to down-clock, but it weird cause this still happens if the profile in Vista is set to High Performance. The only fix I've found is to manually re-force the power settings by changing the power scheme in Vista to power saver or balanced, then force it back to High Performance, then immediately reboot back into OSX. Even if it's already set to the High Performance setting, re-forcing this power profile is the only way I can get the full GPU back when rebooting back into OSX.
Does anyone know of a fix (even if it's command line) that will force the GPU back to full clock speeds in OSX in case I forget to apply this sudo fix before rebooting?
Thanks!
Hardware
24" iMac (3.06Ghz)
4GB RAM
8800GS 512MB
Software
Issue occurred on 10.5.2 and is still occurring in 10.5.3

Answer 1

Ok I think you've missed the point of what's occurring here entirely...
First, show me where it says any of the Intel Mac computers have both a BIOS chip and an EFI ROM in them. To my knowledge, they don't, they only have an EFI ROM. So your statement that bootcamp by-passes the EFI ROM to interface with a Windows BIOS doesn't hold water, cause Mac's don't have a BIOS at all. If it had a BIOS chip, wouldn't I be able to use a PC program like SpinRite (www.grc.com) on an iMac to repair hard drive sector problems, just like I can with every other PC that has a BIOS chip?
Also, I have rEFIt bootloader installed allowing me to choose which partition it boots into, OSX or Windows, without the assistance of Bootcamp Assistant.
Second, I will say it again, I'm well aware the OS's run independently of each other. I know none of the OSX software or drivers are running when Windows is loaded and vise versa. None the less, when Windows loads its ACPI power scheme settings to the hardware within the iMac, the setting settings ARE being translating over to the OSX side.
I'll post a video of it if you don't believe me. World of Warcaft in OSX runs normally at 160-220fps in Ironforge when the GPU is running at full speed. However, if I go into Windows Vista, let the OS sit idle for 5-10mins, then reboot into OSX, then run WoW, the fps drops to 60 max. Areas that run at 60-80fps are crippled to 15-20 max. Also, all OSX effects like spaces are choppy. This occurs regardless of what power scheme setting is loaded in Vista, and the power scheme must be forced to High Performance JUST BEFORE A REBOOT in order for OSX to run the GPU at full power again.
Not to be insulting, but I again and would appreciated an explanation from you or from someone that actually knows how Mac hardware work on how the power scheme settings, from an OS that is supposedly running completely independently from OSX, are being transposed over to OSX AFTER A REBOOT.
The only explanation I can think of is that the settings are being placed onto the GPU ROM by Vista's ACPI and OSX is not resetting these settings (due to bad driver writers) during boot. Every other *nix system I've worked with would reset the GPU settings during boot up, so why isn't Mac?.
I don't know how much more clearer I can make this issue.