Comments on: Enabling more than 4 GB of RAM in Vista: Myth or truth? http://www.webtlk.com/2008/12/10/enabling-more-than-4-gb-of-ram-in-vista-myth-or-truth/ Concise and Accurate News Everyday Thu, 29 Jul 2010 07:11:03 +0000 hourly 1 http://wordpress.org/?v=3.0 By: 32bit OS not recognising RAM greater than 4GB?? - Page 3 http://www.webtlk.com/2008/12/10/enabling-more-than-4-gb-of-ram-in-vista-myth-or-truth/comment-page-1/#comment-3526 32bit OS not recognising RAM greater than 4GB?? - Page 3 Wed, 08 Jul 2009 23:53:30 +0000 http://www.webtlk.com/?p=3420#comment-3526 [...] allow you to use up to 4GB of memory (the upper limit in XP Pro). not even gonna explain it. http://www.webtlk.com/2008/12/10/ena...myth-or-truth/ __________________ Intel Q6600 @ 3.00 Ghz COOLER MASTER RL-EUL-GBU1-GP Watercooling ASUS P5Q SE [...] [...] allow you to use up to 4GB of memory (the upper limit in XP Pro). not even gonna explain it. http://www.webtlk.com/2008/12/10/ena…myth-or-truth/ __________________ Intel Q6600 @ 3.00 Ghz COOLER MASTER RL-EUL-GBU1-GP Watercooling ASUS P5Q SE [...]

]]> By: Web Talk http://www.webtlk.com/2008/12/10/enabling-more-than-4-gb-of-ram-in-vista-myth-or-truth/comment-page-1/#comment-2432 Web Talk Fri, 06 Mar 2009 07:14:09 +0000 http://www.webtlk.com/?p=3420#comment-2432 Thanks Larry for your interesting comment. The topic is quite old but what it stirrs and arises continue to be quite....fresh! May be Windows 7 is going to solve this issue? Thanks Larry for your interesting comment. The topic is quite old but what it stirrs and arises continue to be quite….fresh! May be Windows 7 is going to solve this issue?

]]> By: Larry Miller http://www.webtlk.com/2008/12/10/enabling-more-than-4-gb-of-ram-in-vista-myth-or-truth/comment-page-1/#comment-2416 Larry Miller Thu, 05 Mar 2009 19:57:04 +0000 http://www.webtlk.com/?p=3420#comment-2416 The article is quite good but has some errors. The entire 4GB RAM is not useable because the address space must be shared by memory mapped hardware devices. The devices themselves use very little memory. All modern intel processors have 36 address lines, allowing access to 64GB of RAM. PAE allows access to RAM beyond 4GB, but only in server systems. In client systems maximum RAM is limited to 4GB. There is nothing unusual about how RAM above 4GB is used. All processes see a 4GB virtual address space. The lower 2GB is private to each process while the upper 2GB is reserved for system use. Each process has it's own private 2GB space. Note: this address space is virtual and is completely independent of the amount of RAM in the system. RAM is mapped into a processes virtual space as needed. The method is the same for any section of RAM, above or below 4GB. PAE changes some of the details but the basic principles remain the same. When PAE is enabled it is always used, even for RAM below 4GB. Larry Miller Microsoft MCSA The article is quite good but has some errors. The entire 4GB RAM is not useable because the address space must be shared by memory mapped hardware devices. The devices themselves use very little memory.

All modern intel processors have 36 address lines, allowing access to 64GB of RAM. PAE allows access to RAM beyond 4GB, but only in server systems. In client systems maximum RAM is limited to 4GB.

There is nothing unusual about how RAM above 4GB is used. All processes see a 4GB virtual address space. The lower 2GB is private to each process while the upper 2GB is reserved for system use. Each process has it’s own private 2GB space. Note: this address space is virtual and is completely independent of the amount of RAM in the system.

RAM is mapped into a processes virtual space as needed. The method is the same for any section of RAM, above or below 4GB. PAE changes some of the details but the basic principles remain the same. When PAE is enabled it is always used, even for RAM below 4GB.

Larry Miller
Microsoft MCSA

]]> By: Web Talk http://www.webtlk.com/2008/12/10/enabling-more-than-4-gb-of-ram-in-vista-myth-or-truth/comment-page-1/#comment-1831 Web Talk Thu, 11 Dec 2008 07:22:23 +0000 http://www.webtlk.com/?p=3420#comment-1831 Hello techie007, You are right, you should have provided real infos but as you see I posted your nickname under your comment! If you are going to write a comment which is, let's say, more than 10 lines long, I advice you to use the "Submit" link. Your comment will become a post entry! This advice is also true for all Web Talk's readers. By the way, Nice comment! ;) Hello techie007,
You are right, you should have provided real infos but as you see I posted your nickname under your comment! If you are going to write a comment which is, let’s say, more than 10 lines long, I advice you to use the “Submit” link. Your comment will become a post entry! This advice is also true for all Web Talk’s readers. By the way, Nice comment! ;)

]]> By: 3GB limit my butt. http://www.webtlk.com/2008/12/10/enabling-more-than-4-gb-of-ram-in-vista-myth-or-truth/comment-page-1/#comment-1828 3GB limit my butt. Wed, 10 Dec 2008 22:39:19 +0000 http://www.webtlk.com/?p=3420#comment-1828 Cool I made it to a new blog entry! :) I guess I should've used some real information. ;) Anyhow, thanks for enjoying my explanation, hopefully it helps clear up some of the mystery. Even though this is an aging subject by now it still seems to keep cropping up -- i.e: the new "Tweak UI" for Vista seems to use this PAE fake out to "allow more than 4GB", which is what (somehow) led me to surf into this blog earlier today. :) techie007 aka "3GB limit my butt." Cool I made it to a new blog entry! :) I guess I should’ve used some real information. ;)

Anyhow, thanks for enjoying my explanation, hopefully it helps clear up some of the mystery. Even though this is an aging subject by now it still seems to keep cropping up — i.e: the new “Tweak UI” for Vista seems to use this PAE fake out to “allow more than 4GB”, which is what (somehow) led me to surf into this blog earlier today. :)

techie007 aka “3GB limit my butt.”

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