Windows 7 showing Different Installed (4 GB) and Usable Memory (2.96 GB)
Installed and Usable memory as shown by windows differs when you have installed a Graphics card which shared memory. If you have a graphics card of 1gb memory with shared option, the 1 GB of memory is not usable by other processes. So the usable memory is lower than that is installed.
The above screen shot is from Windows 7 Home on a Dell Studio 15 laptop, with 4 GB installed RAM and an NVIDIA Graphics card with shared memory of 1 GB. Therefore only 2.96 GB of the RAM is usable by the processes.
It is better to buy graphics cards with Dedicated memory even if the memory size is less than that is being shared from RAM. This is because, in shared memory the memory buses might be mostly occupied by the graphics system that can slow the system down. In dedicated memory this problem is avoided because the RAM is not touched for graphics rendering and hence the bus is free for your processes.
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Comments
Usable RAM Asus mobo's
I figured it out. After tinkering with it for a few hours, it turns out that the "Memory Reamp" needs to be enabled. On some Asus mobo's and a few other brands, when Win 7 is installed it recognizes that this problem. The problem was there all along and people just didn't know it until Win 7 was installed and pointed it out as a precursor to a BIOS problem that had been there the whole time.
1 Enter BIOS
2 Advanced
3 Chipset Settings
4 Enable Memory Reamp Feature
5 Exit and Save
6 You’re Done!
just because you install
just because you install windows 7 64 bit doesn't mean your ram will be 4 gig , In my case i have 5 gig of ram and a 64bit windows 7 and i still have all the same problems you guys are haveing and I am fighting with the develepers of windows 7 and all they can say is that the ram wont work because i am running a DDR2 SDRAM .. if you go on the web and find yourself a benchmark program and save the report you will end up with a heap of info and if it like this
General Module Information]
Module Number: 0
Module Size: 1024 MBytes
Memory Type: DDR2-SDRAM
DIMM Type: Regular Unbuffered (UDIMM)
Error Check/Correction: None
Memory Speed: 333.3 MHz (PC2-5300)
Module Manufacturer: Hynix (Hyundai)
Module Model: HYMP512U64CP8-Y5
Serial Number: 1009778688
Manufacturing Date: Year: 2008, Week: 39
[Module characteristics]
Module Width: 64-bits – This also indicates a problem
That module width 64-bits is not suported with the 64 bit windows 7
All this info i am explaining to you all now is the info that the microsoft develepers are telling me at the moment
I hope this helps you as I am still fighting with the develepers about this issue
On some systems, even when
On some systems, even when you have a dedicated video card with (it's) own onboard ram, Windows will still show a lesser amount of ram than what is actually installed. The solution, in my case, was to go into the BIOS under the "Advanced Chipset" option, and set "S/W Memory Hole Remapping" to "enabled". Once I did that and rebooted, the computer then showed the full 4gb of ram as being available, where as it previously showed 3.25 usuable. This was done without the need for a BIOS update. I'm using Windows 7 Ultimate 64bit.
Hope this helps someone. :)
Full 4GB RAM usage
Yes it seems memory remapping solves the problem for some people (though on many PCs the BIOS just doesn't have that feature), but it will only be solved if you are, as you say at the bottom, using an x64 OS. Otherwise you'll still be stuck with 3/3.2GB max RAM. MS have limited their x86 OSs to around the 3GB mark regardless of how advanced the hardware is. Another good reason I upgraded to Win 7 x64!
3GB/4GB RAM
No, apparently according to all the experts I've spoken to (I have this problem - 4GB installed, only 3 used) - the problem is that a 32-bit Windows OS (does not apply to Linux or Mac OS X), has been limited to 3 or absolute max 3.2ish GB RAM. To enable more, you have to install a 64-bit OS, even if it's Windows 7. I wish what you're saying ws true, because my graphics card uses very little shared memory (300MB), thus I should be getting 3.7GB usable RAM and the rest used by graphics. The sad truth is, unless I upgrade to x64 OS, my entire system (graphics included) can only access 3GB, the other 1GB is not used at all. Wasted. Useless. I had this from the Microseoft guys themselves, among others. Of course, your mobo has to support 4GB to start with.
RAM 3G/4GB
Does that mean you have to install a 64 bit Windows OS on a 32 bit laptop to just access 4 GB Memory ?
No, You may not install a x64
No, You may not install a x64 version on a system if your CPU doesn't support X64..
RAM 3G/4GB
Yes it does. As soon as I upgraded to Win 7 x64 my full 4GB RAM was operational. Before that, only 2.99GB. Simple as that. But x64 has other advantages like much better security, and the ability to dish out far more RAM to each app (I think this applies to 32-bit apps as well as 64-bit ones, tho' they perform even better).
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