How do I use a EM64T processor?

I just bought an Intel Pentium 4 640+ processor (3.2GHz 800MHz FSB 2MB Cache) with EM64T.

I have an Asus P5WD2 motherboard and the manual says that it "has a BIOS file that supports EM64T". I guess that means that the motherboad will allow this cpu to run at 64 bit?

I have 2 questions:
1. Can I still run the processor in 32-bit mode in case I don't want to buy a 64-bit OS?
2. How do I get the 64-bit part of the processor to work?


Thanks alot

Zach

1. Yes
2. Install at 64bit operating system and run 64bit apps.

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Ah, the joys of (almost) 100% backward compatability.

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To my knowledge, no. AMD trademarked "AMD 64" and Intel trademarked "EM64T". (Which I still prefer to reorder to EMT64 in favor of the image of emergency medical technicians coming to Intel's rescue to patch the up the P4.)

But hey, why ask me when you can ask the US Patent and Trademark Office? They have an online search for a reason.

Let's seee, according to the USPTO, AMD started filing for a trademark on "X86-64" pertaining to computer hardware, etc. on April 21, 2000. But then they abandoned it March 30, 2001. So its status is dead now. ("AMD 64" by the way was trademarked by AMD on August 11, 2003 and it still live today. So it looks like AMD went for two years without any 64-bit trademarks.)

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