Hmm, for some reason IE wont let me use the board's quote function. So, anyway.......
I had suspected that I could use the EFI partition for both UEFI and BIOS booting, since my PC's seems to imply that it's possible. Unless there's some other info Wonko hasn't made known. To clarify, I'd like to test real UEFI booting (already tested without DUET a few hours ago, it works fine and Windows installs/boots in UEFI mode), while leaving open the possibility of *ALSO* booting Windows in BIOS mode as well. Which is where milind's approach will be useful. I neither need nor have to do this, I'm just doing it because I can. For the learning experience. I could just continue booting in UEFI mode and forget all this. This thread wasn't entirely useless, at the time I originally posted I really believed that real UEFI wasn't possible on my hardware, since the BIOS made mention of it nowhere. But now that I know the truth, I do still feel that I've learned a bit, so not an entirely useless thread. I'll still post my exact instructions later. I might even install DUET in the EFI/protective MBR anyway, just to continue playing with it.
Cdob, did you bother to read my above posts? I have no need for DUET anymore, it turns out Dell had hidden my BIOS's UEFI functionally in menus that only become visible if you flash a hacked BIOS (what I did). My motherboard was capable of UEFI all along, Dell just left on/off switch hidden, to the point that only advanced users would find it. None of their official BIOSes for my model mention UEFI anywhere. The last BIOS release was A08, and that was several years ago. Did you ever get around to trying Rod Smith's DUET approach? Follow it to a tee, see if your AMD is still unable to boot. He does also mention that some people will need to use the slightly older EDK duet-install, which doesn't support AHCI (only IDE, I think). There is a switch for it in the DUET-install scripts, by default the script installs whatever the newest is (what I used). That may work for you.
I know about the fast startup thing, it cause problems in Linux, Linux can only access the Windows volume in read only only, since it's in a sort of hibernation/sleep. Disabling fast startup stops that. It's another UEFI feature that's nice if you only use Windows, but I personally have no need for it.
Thanks for the booting tips, I'm going to see if your advice would work for booting Windows in BIOS mode on GPT. But I don't think it will, I'll probably have to resort to using one of the floppy-variant methods for BIOS booting.
As for the RAM upgrade, I know 8GB is what is officially supported by Dell on my PC. I'll have to research if 16GB is possible. My main interest is in being able to install a game or 2 in a RAM drive for faster performance (and faster than running them from an SSD, too). But I could care less what the manufacturers want me to do with my electronics, or what they support. Support or no supports, if something works, then it just does. When I buy hardware, I have the full expectation that I can and will do what I wish with it, since it is my personal property. I already root all my Android phones and do asinine stuff on my PCs that most others wont try.
My processor is an i7, I'm pretty sure I have 2 memory slots.