Mar 26, 2014 Let’s talk how to enable PAE mode on 32-bit Windows 8.1 and to activate all available RAM for using. Patch for enable PAE, which allows to activate all memory on Windows 8.1 x86. It is impossible to enable PAE mode in Windows 8.1 (Windows.

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Physical Address Extension (PAE) is a processor feature that enables x86 processors to access more than 4 GB of physical memory on capable versions of Windows. Certain 32-bit versions of Windows Server running on x86-based systems can use PAE to access up to 64 GB or 128 GB of physical memory, depending on the physical address size of the processor. For details, see Memory Limits for Windows Releases.

The Intel Itanium and x64 processor architectures can access more than 4 GB of physical memory natively and therefore do not provide the equivalent of PAE. PAE is used only by 32-bit versions of Windows running on x86-based systems.

With PAE, the operating system moves from two-level linear address translation to three-level address translation. Instead of a linear address being split into three separate fields for indexing into memory tables, it is split into four separate fields: a 2-bit bitfield, two 9-bit bitfields, and a 12-bit bitfield that corresponds to the page size implemented by Intel architecture (4 KB). The size of page table entries (PTEs) and page directory entries (PDEs) in PAE mode is increased from 32 to 64 bits. The additional bits allow an operating system PTE or PDE to reference physical memory above 4 GB.

In 32-bit Windows running on x64-based systems, PAE also enables several advanced system and processor features, including hardware-enabled Data Execution Prevention (DEP), non-uniform memory access (NUMA), and the ability to add memory to a system while it is running (hot-add memory).

PAE does not change the amount of virtual address space available to a process. Each process running in 32-bit Windows is still limited to a 4 GB virtual address space.

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System Support for PAE

PAE is supported only on the following 32-bit versions of Windows running on x86-based systems:

Windows 7 (32 bit only)
Windows Server 2008 (32-bit only)
Windows Vista (32-bit only)
Windows Server 2003 (32-bit only)
Windows XP (32-bit only)

Enabling PAE

Windows automatically enables PAE if DEP is enabled on a computer that supports hardware-enabled DEP, or if the computer is configured for hot-add memory devices in memory ranges beyond 4 GB. If the computer does not support hardware-enabled DEP or is not configured for hot-add memory devices in memory ranges beyond 4 GB, PAE must be explicitly enabled.

To explicitly enable PAE, use the following BCDEdit /set command to set the pae boot entry option:

**bcdedit /set [{ID}] pae ForceEnable**

IF DEP is enabled, PAE cannot be disabled. Use the following BCDEdit /set commands to disable both DEP and PAE:

**bcdedit /set [{ID}] nx AlwaysOff** **bcdedit /set [{ID}] pae ForceDisable**

Windows Server 2003 and Windows XP: To enable PAE, use the /PAE switch in the boot.ini file. To disable PAE, use the /NOPAE switch. To disable DEP, use the /EXECUTE switch.

Comparing PAE and other Large Memory Support

PAE, 4-gigabyte tuning (4GT), and Address Windowing Extensions (AWE) serve different purposes and can be used independently of each other:

PAE allows the operating system to access and use more than 4 GB of physical memory.
4GT increases the portion of the virtual address space that is available to a process from 2 GB to up to 3 GB.
AWE is a set of APIs that allows a process to allocate nonpaged physical memory and then dynamically map portions of this memory into the virtual address space of the process.

When neither 4GT nor AWE are being used, the amount of physical memory that a single 32-bit process can use is limited by the size of its address space (2 GB). In this case, a PAE-enabled system can still make use of more than 4 GB of RAM to run multiple processes at the same time or to cache file data in memory.

4GT can be used with or without PAE. However, some versions of Windows limit the maximum amount of physical memory that can be supported when 4GT is used. On such systems, booting with 4GT enabled causes the operating system to ignore any memory in excess of the limit.

AWE does not require PAE or 4GT but is often used together with PAE to allocate more than 4 GB of physical memory from a single 32-bit process.

How-To Geek Forums / Windows XP

How much RAM can an XP computer handle? I want to upgrade my 2GB to 4GB RAM, as my computer is excessively slow.

Computer specs for RAM DDR2 PC2-5300, DDR2 PC2-6400, DDR2 PC2-8500, DDR2 (non-ECC)

Also is there any other way to make my computer faster?

Motherboards vary as to the amount of ram they hold. Best is to go to Crucial.com and run their System Scanner. It will tell you exactly how much and what type you can use.

Esta16, if with 2gb ram in XP is running slow then something else is wrong.
I think you are running on the limit @ 2gb for XP so an upgrade seems pretty useless.

I'd be looking at stopping processes and startups that are unneeded.

Uninstall unused software.

The only other thing that springs to mind of course is that your hard drive might be failing.

Mike

Esta16, hi :)

Just to add to Xhi's post, you can speed up your pc by minimizing the # of startup programs by going to;

Start > Run > type 'msconfig' (w/out quotes) > click the 'Startup' tab.

Uncheck as many programs as possible except for your anti-virus to prevent them from running in the background hogging up your RAM.

I found that older XP installations get very slow over time. For several friends (I have no XP myself) I have therefore reinstalled the XP and it made a world of difference.

If you do reinstall, make sure you save your own data first.

And I agree, 2GB should be ample for XP. More RAM will buy you nothing.

Windows XP 32 Bit can use at most 3 GB of RAM. If you increase your RAM to 4 GB, XP will be able to use inly 3GB of it.

As stated previously, for extreme deterioration of system speed, back up your data and do a reinstall of XP. This will speed your computer up the most. Of course, once you install your needed programs back you will notice a minor slowdown. Try to keep your installed applications and tool bars to a minimum.

I've been troubled with slow-running PCs for years and I've never found the final solution. But there are several steps you could take. All of these can be done with freeware or maybe even better with some selected quality software.
Try cleaning up your registry. CCleaner and TweakUI could get you started. Control programs running at startup. WinPatrol could help. Defrag: Mydefrag is thorough and Auslogics is quick. Deal with programs like RealPlayer and Adobe that want to take over your computer and faff about just to make sure that THEY are all shipshape.
Download Soluto to find out what's going on under the hood. If you could upgrade with more memory, Crucial will tell you how much you extra you can add.
Check that your C drive isn't seized up. If it's overfull download Treesize and find out what's going on in C drive.

For starters.

Russell