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: Windows x86 and 4GB...and what about dual-channel on the mobo?

17 Oct 2011   #1

Windows 7 Professional SP1 32-bit
Windows x86 and 4GB...and what about dual-channel on the mobo?

OK, for a change I have a question of my own. :)

I've googled around and read old threads on this forum and know all about x86 and 32-bit address limitations and hardware devices using memory mapping etc. etc.

So, I have 3GB at the moment, two 1GB sticks and two 512MB sticks so my mobo can use dual-channel support on the entire RAM. If I decide to replace one of the 512MB sticks with a full 1GB stick, netting me a total of 3.5GB in the process, how will this affect dual-channel support? Would it still be active over the first 3GB, or be completely disabled?
Basically, would it be better just to go to 4GB and have four 1GB sticks?

Also, is there a certain hard limit on just how much memory (out of 4GB) the x86 version of Windows 7 can use even under ideal conditions? For example, is 3.5GB the absolute most I could hope for? Is it 3.25GB? Or 3.75GB?

Thanks in advance!!

My System SpecsSystem Spec
17 Oct 2011   #2

Windows 7 Ultimate SP1 64-Bit

As far as I'm aware, 3.25 GB seems to be the ball-park figure you can use with the x86 architecture.

Crucial's memory scanner will give you good advice as to the best configuration for your memory modules, but at this stage I would recommend 2x2 GB sticks, which leaves two sockets spare should you go to Windows 7 x64 and want more memory then.

RAM Memory Upgrade: Dell, Mac, Apple, HP, Compaq. USB drives, SSD at
My System SpecsSystem Spec
17 Oct 2011   #3

Windows 7 Professional SP1 32-bit

Thanks seavixen. :)

Won't be going to 64-bit Windows on this board anytime soon, by the time I do I'm sure it'll be on a new computer...this motherboard only supports a total of 4GB anyway.

I still hope to get an answer about dual-channel support when using mismatched amounts of memory in each channel...anyway, for a mere 256MB gain it doesn't really seem worth it (I was hoping for 512MB though) :)
My System SpecsSystem Spec


 Windows x86 and 4GB...and what about dual-channel on the mobo?

Thread Tools

Similar help and support threads
Thread Forum
Any drawbacks to mixing single-channel and dual-channel for RAM?
Hi, I currently have 2x2GB Corsair DDR3 1333MHz RAM which I had bought around 3 years ago. I am currently thinking of upgrading to 8GB. However, my vendor tells me that 2GB sticks are no longer available for Corsair and that I have to either get a 4GB or 8GB stick. My current 2x2GB runs in...
Hardware & Devices
Single channel VS Dual Channel RAM performance boost?
Hi.. So as usual im an idiot and i looked into my case and am still debating if my ram really should sit right next to eachother and i started Speccy and it said that i had single channel ram 2 different channels with 16GB total. I got confused becouse the motherboard manual said i should put the...
Hardware & Devices
Dual Channel Suddenly Stopped Working, Only Single Channel Remains
Hey everyone I got a bit of a problem here, and I'm at a loss on what to do to fix it. Some background about the situation would be a good place to start. A few days ago I came home from work and found my PC in a "lights are...
Hardware & Devices
dual channel ram in quad channel inputs.
im looking at a lga 2011 x79 board. namely this one> - ASRock X79 Extreme6 LGA 2011 Intel X79 SATA 6Gb/s USB 3.0 ATX Intel Motherboard but am looking at this ram> - G.SKILL Ripjaws Z Series 16GB (4 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model...
Hardware & Devices
RAM: Single Channel to Dual difference?
hi all, recently it came to my notice that i was running my RAM on single channel mode (2x2gb) on my dh67bl mobo. i saw it in cpu z and it showed single channel. So, i changed my ram and placed it in identical slots and now the Cpu z shows dual channel RAM. but i don't see any visible...
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 14:23.
Twitter Facebook Google+ Seven Forums iOS App Seven Forums Android App