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: Question on Available RAM - Win7 32-bit vs. 64-bit

01 Jan 2012   #1

Windows 7 Professional 32bit
Question on Available RAM - Win7 32-bit vs. 64-bit

Hi all -

Why is there a 4gb RAM limit with Win7 32-bit?

I just installed the 64-bit version and now have all of my installed RAM (8Gb) available to the OS.

My System SpecsSystem Spec
01 Jan 2012   #2

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit

My System SpecsSystem Spec
01 Jan 2012   #3

Windows 7 Pro x64

For 32 bit operating systems the address length is 32 bits, which only allows 2 ^ 32 (4 294 967 296) addresses. Now, looking at that number it might seem like your operating system should support 4 GB, but all the other hardware such as your graphic card or any other card that contains memory (the video ram in your graphic card) that has internal memory also gets mapped into that address space which subtracts from that 4 Gigs, so if you have a graphic card with 512MB or ram your 4 Gig system would show 3.5 Gigs of usable memory.
My System SpecsSystem Spec


 Question on Available RAM - Win7 32-bit vs. 64-bit

Thread Tools

Similar help and support threads
Thread Forum
Win7 Activation question..
Hey all..just a quick question... I purchased Win7 OEM and installed it on a new 80GB SSD that I just got for my laptop. I havent activated windows yet on that drive and decided that I want a bigger drive instead. My question is...since I havent activated the OEM windows yet, am I still able...
Windows Updates & Activation
Win7 SP1 Question
Hi Everyone, This has probably been asked before, but forgive me, I am new here. I recently bought a PC running Windows 7 ultimate x64. I have noticed that I have some errors most likely associated with the registry. I am getting the "corrupted search provider" message in IE8 and can't fix...
Windows Updates & Activation
Win7 SP1 Question
Hey Guys and Gals, On the MS download center website there is a file titled: 7601.17514.101119-1850_Update_Sp_Wave1-GRMSP1.1_DVD.iso What is on this image? Is this a complete Win7 w/ SP1 installer iso? here's the link to where i found it: Download details: Windows 7 and Windows...
Windows Updates & Activation
Win7 Question
Hello Windows 7 users: At present I use Windows 2003 as home computer and a Windows XP in a laptop as an office/travel computer. I wish to consolidate my computing usage into 1 single computer. Here is what I wish to do, with some related questions about how to do it. All feedbacks,...
General Discussion
Win7 dualboot AND Win7 update question
Hey, I have two questions: I am running Win7 dualbooted with WinXP, everything works fine. I want to get rid of the XP partition, and keep the Win7 one only, but there is a problem. THe partition on which XP is installed is set as system and active. I've googled around but I've found no easy...
General Discussion

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 15:19.
Twitter Facebook Google+