CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Hardware

>4GB memory question

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   November 17, 2009, 02:43
Default >4GB memory question
  #1
New Member
 
Join Date: Nov 2009
Posts: 9
Rep Power: 7
tjtx is on a distinguished road
Sorry for the very newbie question. I have noticed people are using 8GB or even 16GB memory. Is there a memory size limitation for 32bit Windows operation system?
tjtx is offline   Reply With Quote

Old   November 17, 2009, 06:59
Default
  #2
Senior Member
 
Join Date: Oct 2009
Location: Germany
Posts: 637
Rep Power: 12
abdul099 is on a distinguished road
Yes, there is a limitation to 4GB if you are using a 32bit-windows. Use a 64bit operating system or linux if you need more memory.

regards
abdul099 is offline   Reply With Quote

Old   November 17, 2009, 10:14
Default
  #3
Member
 
Bram
Join Date: Apr 2009
Location: Belgium
Posts: 81
Rep Power: 8
bramv101 is on a distinguished road
Actually its 3.2Gb for 32bits systems
bramv101 is offline   Reply With Quote

Old   November 17, 2009, 10:43
Default
  #4
New Member
 
Join Date: Nov 2009
Posts: 9
Rep Power: 7
tjtx is on a distinguished road
Thanks! Now it's clear to me on the memory size issue. A new question related to 64bit Windows. does that mean many applications currently running on my 32bit Windows will not work correctly under 64bit environment?
tjtx is offline   Reply With Quote

Old   November 17, 2009, 12:48
Default
  #5
Senior Member
 
Join Date: Oct 2009
Location: Germany
Posts: 637
Rep Power: 12
abdul099 is on a distinguished road
There is a compatibility mode, so your 32bit-applications will work correctly on a 64bit-system. of course, applications can't use more than 3,2GB of memory (thanks to bramv101) as long as they are 32bit-applications.
but i think it does not matter, because there is a 64bit-version of most cfd-programs, and word, excel and so on don't need such a huge amount of memory.

regards
abdul099 is offline   Reply With Quote

Old   November 17, 2009, 15:22
Default
  #6
New Member
 
Join Date: Nov 2009
Posts: 9
Rep Power: 7
tjtx is on a distinguished road
Thanks a lot for all the kind help. The whole picture is more clear to me. Now it's down to the machine to buy. I am looking at HP desktop/workstations. Between a top of notch desktop PC and an above average workstation, which one do you guys recommend? The latter may cost more but budget is not much an issue, as long as the benefit from computing power justifies the extra money.
tjtx is offline   Reply With Quote

Old   November 17, 2009, 15:29
Default
  #7
Member
 
Bram
Join Date: Apr 2009
Location: Belgium
Posts: 81
Rep Power: 8
bramv101 is on a distinguished road
Workstation is still more dedicated.. xeon CPU, quadro GPU, SAS drives...
It will all add just that little bit over a standard high end 'game'PC.
HP or Dell not much difference there, just see where you can get the best quote
bramv101 is offline   Reply With Quote

Old   November 19, 2009, 15:30
Default
  #8
New Member
 
HP Kritzinger
Join Date: May 2009
Location: South Africa
Posts: 25
Rep Power: 8
mystic_cfd is on a distinguished road
You should consider 64bit operating systems. Windows is acceptable, but Linux is best if you need to cases requiring more than 2GB of memory. On 32bit systems the memory limit is actually 2GB per process...
mystic_cfd is offline   Reply With Quote

Old   May 14, 2010, 02:05
Default
  #9
New Member
 
Join Date: Aug 2009
Posts: 18
Rep Power: 8
chinc is on a distinguished road
I have a little confusion here on hardware- software bit compatibility.
Does a 32bit CPU support 64 bit OS? I have a 32 bit C2Q system running on 32bit Windows with 4GB Ram. If I changed my OS to 64 bit OS and increase my ram to 8GB, will I get the PC to run at 8GB memory physically?
chinc is offline   Reply With Quote

Old   May 14, 2010, 03:14
Default
  #10
New Member
 
Jemyung Cha
Join Date: Sep 2009
Posts: 8
Rep Power: 7
jemyungcha is on a distinguished road
Quote:
Originally Posted by chinc View Post
I have a little confusion here on hardware- software bit compatibility.
Does a 32bit CPU support 64 bit OS? I have a 32 bit C2Q system running on 32bit Windows with 4GB Ram. If I changed my OS to 64 bit OS and increase my ram to 8GB, will I get the PC to run at 8GB memory physically?
Answer is "no".

You cannot install 64bit OS to your 32bit PC.
jemyungcha is offline   Reply With Quote

Old   May 14, 2010, 04:45
Default
  #11
New Member
 
Join Date: Aug 2009
Posts: 18
Rep Power: 8
chinc is on a distinguished road
Thanks for the information. Appreciate.
chinc is offline   Reply With Quote

Old   May 14, 2010, 05:26
Default
  #12
Member
 
Cedric Van Holsbeke
Join Date: Dec 2009
Location: Belgium
Posts: 81
Rep Power: 7
CedricVH is on a distinguished road
Quote:
Originally Posted by chinc View Post
I have a little confusion here on hardware- software bit compatibility.
Does a 32bit CPU support 64 bit OS? I have a 32 bit C2Q system running on 32bit Windows with 4GB Ram. If I changed my OS to 64 bit OS and increase my ram to 8GB, will I get the PC to run at 8GB memory physically?
A 64bit OS will not work on a 32bit CPU, however, your Core 2 Quad is a 64bit CPU! You can thus install a 64bit Windows or Linux on your system.
CedricVH is offline   Reply With Quote

Old   May 17, 2010, 10:04
Default
  #13
New Member
 
Join Date: Aug 2009
Posts: 18
Rep Power: 8
chinc is on a distinguished road
Thanks very much. I was wrong that my cpu is actually a core 2 duo chip. does this type of processor built on 64bit? if yes, i can consider installing a 64bit OS and make full use of my 4GB RAM.
chinc is offline   Reply With Quote

Old   May 17, 2010, 11:24
Default
  #14
Member
 
kdrbrk's Avatar
 
Burak
Join Date: May 2009
Posts: 90
Rep Power: 8
kdrbrk is on a distinguished road
Is there 64 bit Gambit? I couldn't find it anywhere...
If there isn't, then there is no benefit of converting to 64 bit.
kdrbrk is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
How to optimize the memory usage when using FEM vasilis Main CFD Forum 11 August 24, 2009 23:57
Memory error? Young CFX 3 September 30, 2008 11:33
memory (RAM) question matt FLUENT 7 November 28, 2006 04:30
CFX CPU time & real time Nick Strantzias CFX 8 July 23, 2006 17:50
Run-Time memory conifguration Error Graeme CFX 1 February 21, 2006 00:04


All times are GMT -4. The time now is 06:46.