Tom's Hardware > Forum > Windows XP > Configuration & Customize > [Solved] Win XP - Boot.ini question
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Best answer from pat mcgroin.

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Jibs   10-16-2009 at 09:50:19 AM

Hi all,

While looking at the boot.ini file to enable 3gb switch, I noticed /TUTag=QDGH28 at the end of the line.
Ive tried looking up what it does, but it isn't listed here
http://technet.microsoft.com/en-us [...] 63892.aspx
nor anywhere else, so I am unaware as to what it does.
Anyone have any ideas?

Copy of Boot.ini:

[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect /TUTag=QDGH28


Also, would anybody know if enabling the 3gb switch in windows xp, with a high video card ram, has any effect on
performance?

Thanks

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Best answer from pat mcgroin
The TuTag portion has to do with the program Tune Up Utilities.
It may or may not be on the system currently.
If it isnt on your system you can delete the entry.

As for the performance question the fairest answer is no it wont affect it.
The 3G switch is only helpful in some specific situations and a program need to be written correctly to use it.
Some examples are Photoshop, Flight Sim X and large data bases.
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reyoung01   10-20-2009 at 11:30:23 PM

What 3 GB switch are you refering to?

Reply to reyoung01
Jibs   10-21-2009 at 02:30:39 PM

Quote :

What 3 GB switch are you refering to?



From the Microsoft website.

http://www.microsoft.com/whdc/syst [...] AEmem.mspx

Quote :

The virtual address space of processes and applications is still limited to 2 GB unless the /3GB switch is used in the Boot.ini file.
The /3GB switch allocates 3 GB of virtual address space to an application that uses IMAGE_FILE_LARGE_ADDRESS_AWARE in the process header. This switch allows applications to address 1 GB of additional virtual address space above 2 GB.

The virtual address space of processes and applications is still limited to 2 GB, unless the /3GB switch is used in the Boot.ini file. The following example shows how to add the /3GB parameter in the Boot.ini file to enable application memory tuning:

Reply to Jibs
pat mcgroin   10-21-2009 at 03:49:25 PM
Best answer

The TuTag portion has to do with the program Tune Up Utilities.
It may or may not be on the system currently.
If it isnt on your system you can delete the entry.

As for the performance question the fairest answer is no it wont affect it.
The 3G switch is only helpful in some specific situations and a program need to be written correctly to use it.
Some examples are Photoshop, Flight Sim X and large data bases.

Reply to pat mcgroin
Jibs   10-21-2009 at 04:52:49 PM

Quote :

The TuTag portion has to do with the program Tune Up Utilities.
It may or may not be on the system currently.
If it isnt on your system you can delete the entry.



^ Thank you very much for that, couldn't find the answer anywhere.

I had figured that /3b switch would be used for an overall system boost, allowing it to use more memory, but if that is not the case, I
think I'll refrain from using it, Thanks again Pat

Reply to Jibs
pat mcgroin   10-22-2009 at 03:50:03 PM

Yeah that just the thing, it doesnt create more memory. It creates address space.
Think of it as an apartment complex with one giant room as compared to one with 30 apartments. You still have the same amount of room but with more addresses.

Reply to pat mcgroin
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