Different Windows editions have had different upper maximum RAM limits. 64-bit Windows support different amounts of memory as a SKU differentiating feature, with the low end being 512MB for Windows XP Starter to 128GB for Vista Ultimate and 192GB for Windows 7 Ultimate.
All 32-bit Windows client SKUs, however, including Windows Vista, Windows XP and Windows 2000 Professional, support a maximum of 4GB of physical memory. 4GB is the highest physical address accessible with the standard x86 memory management mode. Hardware Specifications for Windows 7 lays down the minimum memory (RAM) requirements.
How to Increase Java Memory in Windows 7. This wikiHow teaches you how to increase the amount of memory (RAM) that your Windows 7 computer's Java program can use. Increasing the amount of RAM that Java can use will allow it to run quicker. All 32 bit versions of Windows 8.1 – 4GB; Memory Limits for the various versions of Windows 8: Windows 8 – 128GB; Windows 8 Pro – 512 GB; Windows 8 Enterprise – 512GB; All 32 but versions of Windows 8 – 4GB; Memory Limits for the various versions of Windows 7: Windows 7 Starter Edition – 2GB (Note: there is no 64 bit version of Win 7 Starter Edition).
Read: Difference between 64-bit and 32-bit Windows.
Maximum memory (RAM) limits
So, while the maximum RAM limit for 32-bit Windows 7 / 8 editions is 4GB, when it comes to the 64-bit editions, the amount of memory that the OS can address depends on which edition you are running.
Here are the upper RAM limits for the different editions of Windows 7 64-bit:
- Starter : 2GB
- Home Basic : 8GB
- Home Premium : 16GB
- Professional: 192GB
- Enterprise : 192GB
- Ultimate : 192GB
These limits are similar to those for Windows Vista editions, except that Vista Enterprise and Vista Ultimate have had their upper limits raised from 128GB to 192GB.
Windows 8 and Windows 8.1, 64-bit has different memory limits depending on the edition.
- Windows 8: 128GB
- Windows 8 Professional: 512GB
- Windows 8 Enterprise: 512GB.
For Windows Server 2008 R2 Enterprise edition, the limit could extend to even 2 TB.
Hope this helps.
Further reading:
- Physical Memory Limits for Windows 7.
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When building and running an application under Windows*, you need to be aware of the limitations on the size of code and data your program can declare and use. This article is written for users of Intel C++ and Intel Fortran compilers, but is not specific to those compilers.
In this article, '32-bit' will refer to an application built with a compiler 'for applications running on IA-32', even if it is run on a 64-bit version of Windows. In the Visual Studio* environment, this is a 'Win32' platform target. '64-bit' refers to an application built with a compiler 'for applications running on Intel 64' and run on an 'x64' variant of Windows. In the Visual Studio environment, this is an 'x64' platform target. Note that 64-bit applications will not run on a 32-bit variant of Windows.
There are three kinds of memory limits:
- Static code and data - this is all the compiled code plus all static data. In C or C++, static data is generally created by variables and structs declared at 'file scope', outside of a procedure. In Fortran, COMMON and module variables are always static. (POINTER and ALLOCATABLE module variables have their 'descriptor' static, but any allocated data is dynamic.) Variables declared in main programs and in procedures may or may not be static - by default, non-ALLOCATABLE/POINTER arrays are static and scalars are not. Any variable marked as SAVE or) exceeds maximum allowable size (80000000)Another possibility is that the application will appear to link successfully, but when run you will see:<program-name> is not a valid Win32 applicationIt is important to note that these are Windows operating system limits and are not constraints imposed by the compilers.Nfs car games download. Resolving the ProblemIf you are running a 32-bit application, you will need to switch to a 64-bit build and run on a 64-bit variant of Windows. But even on a 64-bit variant, you must reduce the size of static data. The best way to do that is to change to dynamic allocation for large arrays. In C and C++ this is done with pointers and malloc. In Fortran, replace large static arrays with ALLOCATABLE arrays and allocate them to the desired size at the start of the program. In many cases, you can replace COMMON declarations with variables declared in a module, and USE that module where you would have included the COMMON statements. Note that you cannot use data-initialization for ALLOCATABLE arrays - such initialization must be in executable code.If you have questions about appropriate techniques, please ask them in our user forums.
Max Memory Win 7
For more complete information about compiler optimizations, see our Optimization Notice.