Microsoft debuts 64-bit Windows XP Preview OS

“Microsoft now offers a public preview of its 64-bit operating system for computers based on Advanced Micro Devices’ Athlon 64 and Opteron processors. The program is designed to offer an early look at Windows XP 64-bit Edition for 64-bit Extended Systems, for computers based on the two relatively new AMD chips, Microsoft’s Web site said,” John G. Spooner reports for CNET

“While the OS has been in the hands of beta testers for some time, the preview will allow businesses to experiment with it and prepare for the final version, which is still under development, the site said. Using Microsoft’s Web site, people with computers based on either the the Athlon 64 or the Opteron can register to download the 450MB preview file for free or receive it on a CD for a shipping and handling fee. The preview version will expire after 360 days,” Spooner reports.

Full article here.


  1. The achilles’ heel of this is that you must reboot back and forth between 32 & 64 bit modes unless you run an emulator. Otherwise, if you are in 64-bit Windows and need to run a 32-bit app, you must reboot. This may have changed, but not to my knowledge. Compare this to Mac OS X, which allows you to run 64-bit apps on the 32-bit OS alongside 32-bit apps.

  2. So viruses runs 64 times faster? So it has 64 times more security holes and they are 64 times bigger? It will explode after 36 days.. sorry after 360 days?
    The Os has been in the hands of beta testers for some time after that they had to wash their hands…
    The Os has been in the hands of beta testers for some time more than our previous programs.. Totally whopping 5 seconds.

  3. Windows has done it again. Extended 8 bit system to 16 bit system to 32 bit system to 64 bit system ” width=”19″ height=”19″ alt=”smile” style=”border:0;” /> How did they do it? Did they count those 8 bits 8 times?

  4. Expires after 360 days? That’s got to be the biggest plus I’ve ever seen!

    How long will it take to download that 450MB file on my 56k modem? ” width=”19″ height=”19″ alt=”wink” style=”border:0;” />

  5. I believe that Panther itself is 32-bit, but with added ability to address in a 48-bit memory space. The 32/64bit XOR for windows is a limitation of the chip, not necessarily an M$ problem.

    The advantage of the G5 is that it can run both existing 32-bit instructions OR 64-bit instructions, depending on what comes down the pipe. That means it can run 32-bit apps AND 64-bit apps without needing a reboot and a poke around in the BIOS. (BIOS? HA!)

    I may be wrong, but I think some aspects of Final Cut Pro have been tweaked to take advantage of the G5, so there may be a few 64-bit routines in there for rendering already.

    The OS itself maybe doesn’t need to be 64-bit anyway.

  6. Using Internet Download Manager 3.18, which found 11 servers to connect to, it took 17 minutes to download the beta, with cable. Now to find a guinea pig with $300 and a need to upgrade his box. This will be hairpulling fun I can tell.

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