Skip to main content

memory limit - How to check if PAE is enabled? (Windows 7 32 bits)


How to tell for sure if PAE (Physical Address Extensions) is enabled or not?
There is a SPECIFIC command I can use? I can read a registry value or something? (Windows 7 32 bits)


I have found this on Internet but it doesn't answer my question:



If your server has hot-add memory ability (ability to add more memory without shutting down the server !!) or data execution prevention (DEP) is enabled then PAE will be enabled automatically !!



It only reformulate the question as "does my Qosmio x505 laptop support hot-add memory?"



Answer




How to tell for sure if PAE (Physical Address Extensions) is enabled or not?



On any modern Intel/AMD (x86/x64) system with hardware-level DEP, PAE is enabled out of the box on Windows XP (SP2?) and up, since it's required for the DEP feature to work.



"does my Qosmio x505 laptop support hot-add memory?"



No, it most assuredly does not.


Hot-add RAM is generally only found on high-end server hardware.


Edit:


According to MSDN Entry for PAE, it's enabled by default under certain (common) conditions:



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.



So, if the system is booted with PAE force-enabled or supports hardware DEP, PAE is on. That's every single system that's come with Vista or Windows 7 pre-installed, and a significant number of XP systems as well (late P4, Core Solo/Duo, Core 2 systems). The only caveat is if someone has gone out of their way to force disable it by editing the boot.ini file (for XP) or modify the BCD (for Vista/7).


As for how to see that it's enabled, I'm not sure. In XP, if you right click on My Computer and select Properties, the General tab will say Physical Address Extension at the bottom if PAE is enabled. 64-bit Win 7 systems don't seem to say, probably because PAE is always enabled on such systems. 32-bit Win 7 may say something similar in the System Control Panel, but until I can check my home laptop, I can't tell you for sure -- it's the only 32-bit Win 7 system I have access to, all my others are 64-bit.


There doesn't seem to be any registry entry that tells whether or not it's on.


Ultimately, the point is that it's safe to assume it's on unless you have a good reason to believe it's not. If you're writing code that depends on it, use the IsProcessorFeaturePresent function, that's what it's there for.


Comments

Post a Comment

Popular Posts

Use Google instead of Bing with Windows 10 search

I want to use Google Chrome and Google search instead of Bing when I search in Windows 10. Google Chrome is launched when I click on web, but it's Bing search. (My default search engine on Google and Edge is http://www.google.com ) I haven't found how to configure that. Someone can help me ? Answer There is no way to change the default in Cortana itself but you can redirect it in Chrome. You said that it opens the results in the Chrome browser but it used Bing search right? There's a Chrome extension now that will redirect Bing to Google, DuckDuckGo, or Yahoo , whichever you prefer. More information on that in the second link.
Post a Comment
Read more

linux - Using an index to make grep faster?

I find myself grepping the same codebase over and over. While it works great, each command takes about 10 seconds, so I am thinking about ways to make it faster. So can grep use some sort of index? I understand an index probably won't help for complicated regexps, but I use mostly very simple patters. Does an indexer exist for this case? EDIT: I know about ctags and the like, but I would like to do full-text search. Answer what about cscope , does this match your shoes? Allows searching code for: all references to a symbol global definitions functions called by a function functions calling a function text string regular expression pattern a file files including a file
Post a Comment
Read more

How do I transmit a single hexadecimal value serial data in PuTTY using an Alt code?

I am trying to sent a specific hexadecimal value across a serial COM port using PuTTY. Specifically, I want to send the hex codes 9C, B6, FC, and 8B. I have looked up the Alt codes for these and they are 156, 182, 252, and 139 respectively. However, whenever I input the Alt codes, a preceding hex value of C2 is sent before 9C, B6, and 8B so the values that are sent are C2 9C, C2 B6, and C2 8B. The value for FC is changed to C3 FC. Why are these values being placed before the hex value and why is FC being changed altogether? To me, it seems like there is a problem internally converting the Alt code to hex. Is there a way to directly input hex values without using Alt codes in PuTTY? Answer What you're seeing is just ordinary text character set conversion. As far as PuTTY is concerned, you are typing (and reading) text , not raw binary data, therefore it has to convert the text to bytes in whatever configured character set before sending it over the wire. In other words, when y
Post a Comment
Read more

networking - Windows 10, can ping other PC but cannot access shared folders! What gives?

I have a computer running Windows 7 that shares a Git repo on drive D. Let's call this PC " win7 ". This repo is the origin of a project that we push to and pull from. The network is a wireless network. One PC on this network is running on Windows 10. Let's call this PC " win10 ". Win10 can ping every other PC on the network including win7 . Win7 can ping win10 . Win7 can access all shared files on win10 . Neither of the PCs have passwords. Problem : Win10 cannot access any shared files on win7 , not from Explorer, nor from Git Bash or any other Git management system (E-Git on Eclipse or Visual Studio). So, win10 cannot pull/push. Every other PC on the network can access win7 shared files and push/pull to/from the shared Git origin. What's wrong with Windows 10? I have tried these: Control Panel\All Control Panel Items\Network and Sharing Center\Advanced sharing settings\ File sharing is on, Discovery is on, Password protected sharing is off Adapte
Post a Comment
Read more