Installing Windows 7 on 2009 iMac with Radeon 4850 graphics (Guide)

Howdy
(This was originally posted in the iMac forum by me as a reply to a Windows 7 question, but I figured it may be useful here too. This may be adjustable to work on other 2009 series macs, but I make no promises. If anyone has any tips on how to get the things working that I mentioned as not, feel free to reply. I would love keyboard volume control specifically :p)
I was able to get Windows 7 64bit installed on my 2009 iMac. I was expecting it not to work, but in the end it did (with surprisingly little effort)
I have the following iMac:
Early 2009 iMac
3.06 GHz
4GB Ram
Radeon 4850
How to get video to work:
1) Download latest "desktop" video drivers from ATI's site (I used catalyst 9.7)
32 bit: http://game.amd.com/us-en/drivers_catalyst.aspx?p=win7/windows-7-32bit
64 bit: http://game.amd.com/us-en/drivers_catalyst.aspx?p=win7/windows-7-64bit
2) Run MobilityModder from the following link: http://www.driverheaven.net/modtool.php
3) Follow the directions on the page (When it sais Vista only, that means Win7 too)
How to get audio to work:
1) Download exe installer from the following page: http://www.realtek.com.tw/downloads/downloadsCheck.aspx?Langid=1&PNid=24&PFid=24 &Level=4&Conn=3&DownTypeID=3&GetDown=false
2) Run the installer
Things that do work
Video (Built in version isn't the best, follow directions above)
Audio (Built in version doesn't work, follow directions above)
Wireless Internet (Built in)
Wired Internet (Built in)
Bluetooth (mouse and keyboard) (Built in)
Things that I haven't figured out
1) How to get the 64bit apple software frontend to install (the taskbar icon)
2) How to get volume keys to work (the apple keyboard driver actually is worse than default)
3) Things like changing brightness (but I would assume this would go with getting the apple frontend software to work)
Comments
1) It is blazing fast
2) While this works on 64bit, I don't think 32bit would be much different to setup
3) Using the latest ATI drivers are important because they support the new Windows 7 driver model (WDDM 1.1). While older versions may work (like bootcamp 2.1), they won't be the most advanced or fastest performing.
4) While I haven't been able to install the bootcamp software (Win7 warns that it is incompatible), from what I've read (all the posts about DPC latency), it is probably better off for performance
5) Your mileage may vary, I haven't tested this on anything other than my 24" radeon 4850 iMac. I also haven't tested it on 32bit, so don't blame me if something doesn't work right. Basically, if you break something it isn't my fault
6) Bluetooth pairing is somewhat quirky, it usually goes pretty quickly for the mouse. Sometimes it will take multiple tries (canceling out, and starting again, etc) especially for the keyboard. Once everything is paired though it works perfect without any extra drivers.
7) Remember this isn't supported by Apple yet.

Hi Beta_,
If you are looking for assistance in setting up Windows 7 in Bootcamp on your iMac running Mavericks, you may find the following articles helpful:
Mac Basics: Using Windows on your Mac via Boot Camp
http://support.apple.com/kb/ht1461
OS X Mavericks: Use Windows 7 or Windows 8 on your Mac
http://support.apple.com/kb/PH14129
Regards,
- Brenden

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