Windows 7 Forums

Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: Why Win 7 64bit has a limit of 192Gb RAM?

01 Aug 2012   #1
antares

Windows XP Professional SP3/Windows 7 Ultimate x64
 
 
Why Win 7 64bit has a limit of 192Gb RAM?

If a 64bit OS can use up to 8Tb, why is it that Win7 64bit can only use up to 192Gb and not 8Tb?


My System SpecsSystem Spec
.
01 Aug 2012   #2
DustSailor

Microsoft Windows 8.1 Pro 64-bit
 
 

Because it is a software limitation.

Are you getting RAM confused with virtual address space? - http://en.wikipedia.org/wiki/Virtual_address_space

Besides that, you won't find any home-user motherboard with enough space for that much RAM. Nor will you ever need it. If 8GB is 'really fast' today, and 2GB was 'really fast' some time ago, think just how long it would take in years for 8TB to be useful as a 'really fast' gaming system. Not in your lifetime, nor your childrens'.


Quote:
  • 8 TB of "user mode" virtual address space per process. A x64 program can use all of this, subject of course to backing-store limits on the system, and provided it is linked with the "large address aware" option.[53] This is a 4096-fold increase over the default 2 GB user-mode virtual address space offered by 32-bit Windows.[54][55]
  • 8 TB of kernel mode virtual address space for the operating system.[54] As with the user mode address space, this is a 4096-fold increase over 32-bit Windows versions. The increased space primarily benefits the file-system cache and kernel-mode "heaps" (non-paged pool and paged pool). Windows only uses a total of 16 TB out of the 256 TB implemented by the processors because early AMD64 processors lacked a CMPXCHG16B instruction.[56]
Windows Server 2012 can use up to 4TB RAM

x86-64 - Wikipedia, the free encyclopedia
My System SpecsSystem Spec
01 Aug 2012   #3
dejavecue

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by antares View Post
If a 64bit OS can use up to 8Tb, why is it that Win7 64bit can only use up to 192Gb and not 8Tb?

Just because something can be done, does not mean it makes sense (at this time). That is why you don't see overclocked CPUs with liquid nitrogen cooling in any computer store. Yes, it allows for extremely high clock speeds, but it just plain is not useful.

When we get around to 192GB of RAM as a normal amount of RAM in home computers, I doubt we will still use Windows 7. And even then Microsoft could probably just patch it out. For now it's just senseless to ask for this kind of RAM amount.
My System SpecsSystem Spec
.

01 Aug 2012   #4
yehuda

windows 7 ultimate 64 bit
 
 

Lol. 16Gb starting to be expensive. And the 32Gb are expensive can't imangine how much cost 192Gb not mantion have no clue why do you need that number.
My System SpecsSystem Spec
01 Aug 2012   #5
antares

Windows XP Professional SP3/Windows 7 Ultimate x64
 
 

Hi all, not that I need 8Tb RAM lol, I was just curious from a theoretical viewpoint as to why that limitation was imposed in Win7 or if it was an actual technical hurdle. Anyway, I only have 2Gb currently in an 11 year old P4 XP PC. I would be more than happy with 16Gb RAM.
My System SpecsSystem Spec
01 Aug 2012   #6
rraod

MS Windows 7 Ultimate 64-bit SP1
 
 

Dell offers PC that packs 192GB of DDR3 RAM [not a typo]

Estimated cost of this PC is around $50,000 !!!
My System SpecsSystem Spec
01 Aug 2012   #7
antares

Windows XP Professional SP3/Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by rraod View Post
Dell offers PC that packs 192GB of DDR3 RAM [not a typo]

Estimated cost of this PC is around $50,000 !!!
That article is dated March 2009. RAM prices have come down drastically, not to say that 192Gb is "cheap", but it should be less than half of that price
My System SpecsSystem Spec
02 Aug 2012   #8
boogieboy

Windows 7 Ultimate x64 SP1
 
 

8GB is more than enough for me and who in the world needs 192GB of RAM?

Answer: Nobody.
My System SpecsSystem Spec
02 Aug 2012   #9
dejavecue

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by boogieboy View Post
8GB is more than enough for me and who in the world needs 192GB of RAM?

Answer: Nobody.
I upgraded roughly 1 year ago, when I was still working.
I upgraded to 16 GB RAM, but only because I now go to university and know that I won't be able to upgrade for some time (read: probably at least 4 years).
For now, I use 8 GB as a RAM-disk. The other 8 are windows managed.
All runs really fast and I don't have to fear the next few generations of OS' or games (at least concerning RAM).
My System SpecsSystem Spec
Reply

 Why Win 7 64bit has a limit of 192Gb RAM?




Thread Tools




Similar help and support threads
Thread Forum
MTU Limit - Test and change your connection's MTU limit
An MTU limit that is set too high can cause fragmented packets and packet loss on your connection. This tutorial will explain how to test if your MTU limit is sending fragmented packets and will explain how to find what value you should be using. 1) Open an elevated command prompt and type: ...
Tutorials
What will be the limit?
In terms of game requirements, and how demanding they are. What would a game need to do in order to increase it's demands to the system past.. lets say.. A GTX Titan, or an HD7970? It seems those cards can pretty much obliterate any game. But what about games? What would a game need to have...
Gaming
cd key limit on 1 pc
HELlo, i have a system with ligit windows on which i was gettin a blue screen error so i reinstalled windows on the same computer so far i havent made mine legit so can i enter the same key on my same system? p.s. how many times can use my key on the same system?
Windows Updates & Activation
Is there a TCP limit?
The resource monitor has been showing low, constant numbers of connections even with moderate bittorrent activity (>1mpbs). Are there are built-in limits on any type of TCP connection?
Network & Sharing
Tcp limit patch
Guys, there's a little patch spreading on the web, that can patch memory or file. I just can patch memory, it doesn't allow me to patch the file. That sucks a bit because when i reboot the laptop, the limiter comes in action again. anyone knows a way to patch tcp forever?
Network & Sharing


Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

© Designer Media Ltd

All times are GMT -5. The time now is 05:35.

Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App