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: 64bit 4GB (3.25 Usable). Waste of an update?

16 Dec 2010   #11

Win 7 SP1

I had a similar situation with an older Gigabyte motherboard.

I was able to install 4gb on the board, but I was only able to see 3gb on it due to other hardware limitations - older chipsets and ports. It was a transition board that had both SATA and IDE interfaces on the board, IIRC.

Because of the limitations, the board was unable to access the upper portion of the memory - it needed to keep that part reserved for the hardware.

I'd check your motherboard manual and/or website to see if you have a similar situation.


My System SpecsSystem Spec
16 Dec 2010   #12

Windows 10 64 bit

Good point. If all you have is 4 GB of RAM there is no reason to install a 64 bit OS, unless you plan on adding more RAM.
My System SpecsSystem Spec
16 Dec 2010   #13

Windows 7 Home Premium 64 bit

You can try:
Msconfig>Boot>Advanced options...>
Check the Maximum memory box.
Make sure it's show 4096.
If it doesn't, use the up arrow to increase it.
OK out and restart your PC.
My System SpecsSystem Spec

16 Dec 2010   #14
Hopalong X

Windows7 Pro 64bit SP-1; Windows XP Pro 32bit

Most of us run 4GB with Win7 64bit just fine with plenty left over.

2GB I would agree.
My System SpecsSystem Spec
16 Dec 2010   #15

Windows 10 Education 64 bit

I'm running 4 gigs with windows 7x64. My video card has another gig of dedicated RAM on it. If I was running 7x32 that gig would subtract from my 4 gigs and I'd only be able to use 3 gig of it. Running 7x64 lets me use it all. Seemed like a no-brainer to me.
My System SpecsSystem Spec
17 Dec 2010   #16

Linux CENTOS 7 / various Windows OS'es and servers

Hi there
Running in 64 bit mode offers other advantages - especially for things like Photoshop -- Instruction time is shorter etc etc.

The RAM advantage really needs more than 4GB when using a 64 bit OS before you will see anything large in available address space.- but using all the RAM doesn't necessarily mean that your system is running badly.

There's a lot more to measuring OS performance than just looking at the available RAM.


My System SpecsSystem Spec
17 Dec 2010   #17

Windows 7 Professional

No but seriously, can 32-bit even see and use all of 4GB. I thought there was a limitation of only 3.25-3.5GB with 32-bit OS kernel or something?

I remember trying to choose between 32 and 64-bit for installation and I ultimately chose 64-bit cause it can use all 4GB instead of just 3.5GB (512mb wasted) at max in 32-bit. If I'm wrong and they somehow fixed up 32-bit (not likely, they would have done it Vista before 7 was released) then I'd love to go back to 32-bit. More easy on programs and games compatibility (especially older games) for me.

Let me know,
My System SpecsSystem Spec
17 Dec 2010   #18

Windows 10 Education 64 bit

32 bit windows can only address up to 4 gigs max. Included in that 4 gig is any address space used by other components such as your video card. If you have a dedicated video card with 512 megs of ram that subtracts from the 4 gig of address space. You would end up with 3.5 gigs of usable RAM, thats all windows can map into the remaining address space. Thats shall we a Cliff's notes explanation of it. I think if you follow some of the links posted in this thread you'll get a better explanation of why it is the way it is.
My System SpecsSystem Spec
17 Dec 2010   #19

Windows 7 Ultimate x64

Quote   Quote: Originally Posted by jimbo45 View Post
Hi there
Running in 64 bit mode offers other advantages - especially for things like Photoshop -- Instruction time is shorter etc etc.
With the caveat that you have to be running 64-bit versions of the software in question. I know you are aware of this, but just throwing it out there for those that might read into that statement that 64-bit is just magically faster across the board.
My System SpecsSystem Spec
17 Dec 2010   #20
Prof Kerfuffle

Windows 7 Professional (x64/SP1) /Linux Mint 16

I have 2GB of ram and changed to 64-bit about a year ago and got 2.0GB usable instead of 1.75GB usable.
My System SpecsSystem Spec

 64bit 4GB (3.25 Usable). Waste of an update?

Thread Tools

Similar help and support threads
Thread Forum
On Windows 7 64bit only 1.99 of usable ram?
Hi, I've just installed Windows 7 Professional today (64bit) and I noticed that it only shows and uses 1.99 GB of ram, it used to show that too in 32 bit which I've been using until today, but I wanted to have a little bit more of useful ram, but nothing.. What should I do, because you can see...
Performance & Maintenance
Usable RAM -Windows 7 64bit
Hello, My query is: Why does my Vaio with 4gb ram say only "3:00 GB usable"? Thanks in advance?
General Discussion
64bit 4gb installed 3.12 usable?
Hi all, I have w7 installed with 4gb, but only 3.12 is usable. How come? Any ideas out there?
Hardware & Devices
Win 7 64Bit 6GB (3GB usable)
i am having some problems my win 7 64 bit is using only 3GB but i have 6GB my System: CPU: i7 920 Motherboard: GA-EX58-UD3R (rev. 1.0) F9 bios GPU: HD4850 Visiontek Ram: 3 x 2GB Corsair (cm3x2g1333c) Please i need any help.
General Discussion
4gb RAM. 2gb Usable. Win7 64bit.
Hi guys i've had this problem for a while now and haven't been able to find a solution and wondering if anyone can help. my motherboard is a ga-p55-ud3 and i was told to upgrade the bios but the current one for my motherboard is beta and i'm a bit weary. i...
Hardware & Devices

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 18:39.
Twitter Facebook Google+