Hi Nick,
what do you think about this? I´ve read it in
http://orbxsystems.com/forums/index.php?topic=5553.30page 2 from "faser"
Here's a detailed howto I found on SimForums.com. There's plenty of similar articles if you google "FSX XP OOM 2560".
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I use WinXP; not sure about Vista. The instructions below reference WinXP Pro, but I've done this on WinXP Home.
The two steps are below. Remember, you do this at your own risk. Also do searches on this forum and Avsim's FS9 forum for "/3GB switch", "OOM", and "Out of Memory" to learn more. And search google for "/3GB switch" and "/userva" and you'll find the Microsoft tech pages describing this stuff.
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STEP 1 -
Here's how to enable the 3GB switch (thanx to Michael Swannick):
Adding the 3GB switch is very simple. You first need to locate your machines Boot.ini file which should be located in the root of your main system drive. (Be aware that this file may be hidden and marked as read-only initially.) You will want to open this file in a program such as Notepad to edit it properly.
Before adding the 3GB switch though it is important to note that the switch is very picky, and requires that every device and driver on your system be fully WinXP compatible in order to work at all. If anything in the system is not compatible, Windows will not load at all when restarting with the 3GB switch activated. The only way to then remove the switch from the Boot.ini file so that Windows can load is to either mount the drive in another system and manually change the boot.ini file, or reformat the drive and re-install Windows. Both solutions are far from ideal.
To safely add the 3GB switch we recommend adding a second instance of the OS in the boot.ini, and add the /3GB switch to that second version.
----- default boot.ini without 3GB Switch -----
This is what a default boot.ini file will look like. (This may differ from system to system.)
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Pro"
----- updated boot.ini with 3GB Switch -----
This is what the updated version should look like. Notice the /3GB that has been added to the second instance of the OS line.
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Pro"
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Pro with /3GB" /3GB
And if you have a 512MB or greater video card, you'll need to add the /Userva=? also. I have a 512MB card, and 2560 works for me so:
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Pro with /3GB" /3GB /Userva=2560
If you have a 640MB or 768MB card, you'll need to experiment.
Once you have updated your boot.ini file accordingly and have saved the changes, simply restart your system for the changes to take affect. When your system reboots you will be given the option to choose either the standard Windows XP version or the 3GB switch enabled Windows XP version. If you choose the 3GB version and it fails to allow Windows to properly load, just restart your system and you will be given the two options once again, where you can then choose the standard Windows XP version to load. Either way, if it works or doesn't, you can then remove whatever line you don't need in the boot.ini file. Alternately, you may wish to leave both settings so that you can choose to boot without the 3GB switch should you ever have problems with drivers installed in the future. The boot loader will default to the first option listed in the file. So you may want to put the /3GB option first. You may also wish to lower the timeout value to something quicker so that you don't have to wait for 30 seconds or press enter with each boot.
Is to add the 3GB term necessary? I believe you more than others, therfore the question.
Thank´s for your reply and comments
Cheers Rainer