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I read this in my ASUS manual:If I were to install 4GB of memory into a maching runing Windows XP Professional what would happen? What about Windows XP Professional x64?Quote:
IF you installed four 1GB memory modules, the system may detect
less than 3GB of total memory because of address space allocation
for other critical functions. This limitation applies to Windows XP
32-bit version operating system since it does not support PAE
(Physical Address Extension) mode.
My mobo supports 4+ gigs of ram.
Ah, yes. The motherboard does. But what about Windows?Quote:
Originally Posted by Freddy_Kruger
I don't know about this...It says 32 bit win sees only 2.7 gigs but 64 bit will see 16 gigs :eek: lol.
definetly some issues there.
"
In terms of XP, 32bit should be able to SEE 4GB, right? Isn't the only issue with the 32bit XP that it can only allocate 2GB per process? Microsoft's website says this about memory:
"The major differentiator between 32-bit and 64-bit Windows is in memory support. Currently, 32-bit Windows is capable of supporting up to 4 GB of system memory, with up to 2 GB of dedicated memory per process. Windows XP 64-Bit Edition will currently support up to 16 GB of RAM, with the potential to support up to 16 TB of virtual memory as hardware capabilities and memory sizes grow. " (http://www.microsoft.com/technet/pro...e/xp64ovw.mspx)
Either way, the funny thing is that the problem is evident before Windows even begins to load. The bios POST counts up to 2.7GB, then pauses and skips to 4GB. When I run a software memory checker (which boots itself independent of any OS), it likewise only sees 2784 MB."
Windows supports and sees 4GB memory. The server versions support/see much more. The largest server configuration I've used has 96GB memory.
I believe the issue with Asus is the way they make their boards. I recently explored using an Opteron 170 processor as a test bed for a new server OS. I looked at the Asus boards extensively before determining that they don't meet the specifications for the OS product testing. The Asus web site clearly states that the 3GB limitation is because of resources in the south bridge.
i used to know some of the specifics - but haven't been up on it lately - and ua549 is correct about the asus boards;
see
http://www.microsoft.com/whdc/system...AE/PAEdrv.mspx
and
http://www.microsoft.com/whdc/system...AE/pae_os.mspx
No matter how much ram a board or the 32-bit version of the OS supports, a single application cannot address more than 2GB of RAM. With the right compiler flag and a boot.ini switch set, you could presumambly increase that limit to 3GB, though there has been no definitive evidence of this actually working.
So lots of ram on servers is great when there are many users running many applications, but any individual application will never be able to use all that memory.
The 3GB option works in code that is designed to use it such as SQL and graphics manipulation. My own graphics workstation with a 4GB memory limit is always short on available memory.
won't 64bit apps not have this 2GB limitation as well ?
if so - i say to all coders... "'let's get a move on'"
No, the 2GB limit is the "32-bit addressable space" limitation. The 64-bit limit is monstrous. I had the number once, but don't recall what it is right now for x64.Quote:
Originally Posted by I4one
Only 32 bit Windows has the 4GB limit divided between Application and OS 2/2 or 3/1.
64 bit Windows can handle 4GB per process.
Here is a rundown on physical memory support.
Windows XP Home & Pro -- 4GB
Windows XP Pro x64 Editions -- 16GB
Windows Server 2003 Web & SBS -- 2GB
Windows Server 2003 Standard -- 4GB
Windows Server 2003 Enterprise -- 8GB
Windows Server 2003 Enterprise on X86 -- 64GB
Windows Server 2003 Enterprise on x64 -- 128GB
Windows Server 2003 Enterprise on Itanium -- 1024GB
In addition there are many proprietary modifications to the Enterprise editions that extend the memory capabilities for large proprietary multiprocessor systems such as those offered by Unisys.
rock;
i realize how awkwardly my question actually reads - but the answer then, is YES ! -- as in there's no 2/3GB per process limits for apps written for x64... (i.e. apps written in 64bit code, not merely 'supported' through backwards compatability).
thanks ua - there's another list somewhat like yours in the ms link i posted - and this is interesting;
>> Windows Server 2003 Web & SBS -- 2GB
>> Windows Server 2003 Standard -- 4GB
so i assume 2k3 SBS is cheaper in cost of OS vs 2k3 Standard ?
why only 2GB total ? it's a Small Business Server ?
Quote:
Originally Posted by rock
It works. Last week I needed to render a huge 3ds max scene with about 75 million of polygons, hires textures, raytraced reflections and global ilumination. 3ds max used 2,7 gb of ram to render that monstruos scene.
Quote:
Originally Posted by ImaNihilist
Here's a list of how much RAM the various Windows versions and editions support (as of Nov 2004):
Windows NT 4.0: 4 GB
Windows 2000 Professional: 4 GB
Windows 2000 Standard Server: 4 GB
Windows 2000 Advanced Server: 8GB
Windows 2000 Datacenter Server: 32GB
Windows XP Professional: 4 GB
Windows Server 2003 Web Edition: 2 GB
Windows Server 2003 Standard Edition: 4 GB
Windows Server 2003 Enterprise Edition: 32 GB
Windows Server 2003 Datacenter Edition: 64 GB
http://support.microsoft.com/kb/555223
Thanks for answering a question from 2005, with an answer from 2004, in 2009.
Weird.
Interesting though? last I heard MS were touting 3.12Gb not 4.0. Reminds me of their 9x/ME days when you were supposed to be able to use 2Gb of physical memory...........but God help you if you installed more than 512Mb :D
And nobody mentioned that your video card is included? In 2009 a 1Gb vid card is not unusual?
You are confusing usable with supported. Windows 32-bit et. al. supports up to 4GB of RAM. However the user will only be privy to roughly 3.0-3.25GB of that, due to OS overhead and memory mapping.Quote:
Originally Posted by nihil
Lol at the response to a 4 year old topic. Technically for XP/Vista (server OS is different) its 4GB minus other allocatable memory. So if you have 1.5GB of Video ram you only see 2.5GB in windows.
What about using 4 gigs total on an Asus board -- using winXP Pro x64. Currently I'm using two 1GB cards on the two of my four slots. Does it make sense to buy another 1GB card or 2 of them, to make a difference for 3D rendering etc?
Thanks (BTW I'm using maya 8.5 & Mental Ray)
XP no matter what version will only support 4GB total system memory (including any memory on graphics), so it really depends on your graphics card?
If your system has no dedicated graphics and uses onboard graphics, then have 4GB and you'll probably see 3.75GB (ish). If you have a 1GB (or close) graphics card, then just purchase an extra 1GB only.