All the 32bit versions of windows can handle a maximum of 4GB ram, whereas the 64bit version can handle more than 4GB of ram. Adding to this, there some versions of windows such as the Windows 7 Starter Edition, which can only supports 2 GB of installed memory. Physical memory limits in Windows 7. To help cut through the confusion, I've taken a careful look at memory usage on a handful of Windows 7 systems here, with installed RAM ranging from 1 GB to 10 GB. So I have just upgraded my laptop from 2GB RAM to 4GB on a 32-bit Vista installation. I may move to 64-bit at some point, possibly as part of an upgrade to windows 7, but my maximum memory use is closer to 3GB than 3 1/2 GB, so there’s just no pressing need at the moment. Windows 7 will take the maximum amount of supported system memory well beyond the limits of Windows Vista.In this regard, the high-end edition of the upcoming Windows client will play nice with.
You can simulate a low-memory environment for testing without changing the amount of physical memory on the computer. Instead, you can limit the memory available to the operating system by using truncatememory or removememory options with the BCDedit /set Spices assessment tool pdf. command.
The /maxmem parameter specifies the maximum amount of memory available to Windows. It is calibrated in megabytes (MB). Set the value to any amount less than the actual physical memory on the computer.
The /maxmem parameter actually determines the largest memory address available to Windows. Due to gaps in the mapping of physical memory, Windows might receive somewhat less memory than the value of /maxmem. For more precision, use /burnmemory.
The truncatememory or removememory options are available in Windows 7 and later. The truncatememory option disregards all memory at or above the specified physical address. The removememory option reduces memory available to Windows by the specified amount (measured in MB). Both options reduce memory, but the removememory option is better at restricting the operating system to use the specified memory while accounting for memory gaps.
Boot Parameters to Test in a Low-memory Environment in Windows
To simulate a low-memory environment, use the BCDedit /set command and the removememory option to modify a boot entry. Set the value of removememory to the amount of physical memory on the system minus the desired memory size for this test.
For example, to limit the memory of a computer with 2 GB of physical memory to a maximum of 512 MB of available memory, set the value of the removememory parameter to 1536 (2 GB (2048 MB) - 512 MB = 1536 MB).
The following example shows a BCDEdit command used to remove 1536 MB of memory from the total available to the system for the specified boot entry.
You can also use the truncatememory option with the bcdedit /set command to achieve the same result. When you use this option, Windows ignores all memory at or above the specified physical address. Specify the address in bytes. For example, the following command sets the physical address limit at 1 GB for the specified boot entry. You can specify the address in decimal (1073741824) or hexadecimal (0x40000000).
Because the removememory option makes more efficient use of system memory, its use is recommended instead of truncatememory.
When you are finished testing, you can remove the removememory and truncatememory boot entry options using the BCDEdit /deletevalue command.
Most of us are now probably using a 64-bit Microsoft Operating System like Windows 7 x64 or Windows Vista x64, which allows the computer to address more than 3GB of RAM. Did you know, however, that any 32-bit applications you run are still limited to making use of only 2GB of RAM? This includes many games and probably the version of Microsoft Office you have installed, unless you specifically opted to install the 64-bit version.
Windows 7 Limit Memory Usage By Application
You might wonder why this is a problem. Well, obviously if your system has more than 2GB of RAM, it’d be great to allow your applications or games to make use of it. Furthermore, some applications actually crash when they hit this limit, or start popping up boxes with out of memory errors. If you work on large excel files (500,000 rows+) then you’ll know what I’m talking about.
32-bit Windows 7 Memory LimitThe Solution
Thankfully, there’s a solution! A great coder by the name of Daniel Pistelli has written a little patching application that will modify your 32-bit programs, and allow them to address up to 4GB of RAM. It’s important to remember that this utility is only useful if you are running a 64-bit OS. If you don’t know what I’m talking about, then here’s an easy way to check:
To edit a macro, you use the Visual Basic Editor. On the Developer tab, under Visual Basic, click Macros. If the Developer tab is not available. On the right side of the ribbon, click. Edit macros in word 2013. Click on the Office button on the top left corner of the window. Choose “Word Options” at the bottom of the list on the right. Click on the “Disable all macros with notification” option so that the macros will be disabled but you will receive a popup window asking if you want to enable macros individually.
1. Go to Control Panel, and click view by “small icons” in the top right hand corner
2. Click System 3. As per the image below, next to System Type, it should say 64-bit operating system. If it doesn’t then this utility is of no use to you.
The second thing to remember is that this utility can only be used on 32-bit applications. If you are unsure if an application you are running is 32-bit, run task manager by pressing CTRL-SHIFT-ESCAPE. Click the tab for processes. A list of currently running programs will load. Find your application in the list, and look to see if it has *32 next to it. The example image below illustrates what I mean.
Using the patch
Assuming that you’ve followed the previous two points and now wish to patch your 32-bit application, first backup the executable file of the program you wish to patch. If the patching process fails, or if you need to download an update for the program you are patching, you may need to revert to the original file. Remember, you only need to backup the executable file for the program (i.e. the file with a .exe extension), not the entire program folder itself. Once you’ve done this, download the patching utility from here. Run it, and it will ask you to select your program. Simply select the executable file you wish to patch and the utility will work its magic. Upon completion, it will ask you if you wish to patch another file. If you do, go ahead, if not, quit!
Conclusion
If all goes well, your application should now be able to make use of up to 4GB of RAM. Obviously this will be most useful for resource-intensive applications, and you’ll probably see the greatest benefits with games. Some productivity software will also benefit, assuming you aren’t utilising the 64-bit versions of these (e.g. Excel, Photoshop, 3D Studio Max, and so on.)
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