Snow and Boot Camp and Windows 7 64 Bit and 8GB RAM

So - here is my problem...
I hab my MacBook Pro 4,1 (early 2008) running with 4 GB RAM and Leo 10.5.8. I used Leo Boot Camp to have my Vista 32 Bit running for my office things. Everything worked fine.
Then I decided to do two things.
- Upgrade to Snow Leopard and install Windows 7 Ultimate 64 Bit. (I have it already.)
- Upgrade memory to 8 GB RAM
Step 1.
I did the upgrade to SL. No problems. Then I did the installation of Windows 7 64 bit. No problems. The machine is running stable.
Step 2:
I upgraded the memory to 8 GB RAM. SL boots without any problems and shows 8 GB RAM. But Windows 7 no refuses to boot. So I tried to install Windows Server 64 Bit. No sucess. I tried Vista 64 Bit - no sucess. I even tried Linux 64 Bit - no sucess.
And here are the funny details:
1. SL works fine with the 8 GB of RAM.
2. Windows 7 64 Bit refuses to boot with 8 GB of RAM.
3. Windows 7 64 Bit works stable with 6 GB of RAM.
4. Windows 7 64 Bit works stable with 4 GB of RAM.
What is the reason? I thought it could be an EFI problem. Just like EFI ist in 32 Bit (but Windows works with 6 GB of RAM). Or do I make a stupid user error???
Should I press a certain key while booting the machine with boot camp? Do I need an EFI patch?
Please help!
Robert.

Actually you don't need an EFI64 ROM to support 8 GBs of RAM. That is determined by the bus size and the memory controller. The ROM only determines the maximum amount of RAM that the OS can address. None of the Macs currently in production can support even the maximum supported by the 32-bit kernel. None have a wide enough memory bus. Of course newer models may support larger amounts of RAM when they are released, but for now there's not much need for using the 64-bit kernel except if you are developing 64-bit software and need to test its compatibility with the 64-bit ROM.

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It puzzles me that on my 2nd iMac under "Bluetooth Devices"
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Typing the body of the thread message in the title, huh? -)
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