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HoodiBoY

10 GB RAM Installed.Only 3.9 GB Usable

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I am facing a weird issue with one of my P.C.

We have installed 3 module of DDR-3 RAM of 4/4/2 GB

But in Windows 7 it shows only 3.9 GB usable.

Please help.

 

Specs are as follows

Intel? Core? i5-760 Processor (8M Cache, 2.80 GHz) 1156 LGA

 

Intel DH55TC Mobo

 

Corsair 10 GB DDR-1333 Mhz

 

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Looks like you have a 32bit version of Windows installed...

 

Install Windows 7 x64 and you'll have access to all of the ram above 4GB.

 

If you have it installed check that the memory remap feature is turned on in your BIOS.

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Yup. Congrats, you're using a 32-bit OS. You'll need to upgrade to 64-bit to use that memory.

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You should know that by now. Get 64-bit.

 

32-bit can only see ~4gb

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Looks like you have a 32bit version of Windows installed...

 

Install Windows 7 x64 and you'll have access to all of the ram above 4GB.

 

If you have it installed check that the memory remap feature is turned on in your BIOS.

 

 

Yup. Congrats, you're using a 32-bit OS. You'll need to upgrade to 64-bit to use that memory.

 

 

This problem is also on 64bit system as well...  See example:

 

ramissue.png

 

Not my screenshot but I got it from Google.

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I encounter similar issues with friend's computer,

it turn-out that DEP are not enabled on bios settings and for reasons that i do not know enabling it would also enable his windows 7 x64 access memory beyond 4GB boundaries.

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On that Acer computer, it's probably using Shared Memory for the video card, hence not all of it is available to the OS.

 

Also, sometimes it's a limitation of the chipset on the motherboard.

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This problem is also on 64bit system as well...  See example:

 

Not my screenshot but I got it from Google.

Integrated video often reserves RAM no matter what OS you're running.

 

So back to what everyone else said, you need a 64 bit OS.

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Could be a BIOS setting, or some RAM is not recognized somehow. Try inserting it again to be sure.

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Err, no it's not, that's a completely different problem altogether, that sort of missing ram on a 64bit OS is from shared graphics memory, you will no doubt find that is an acer laptop that has the bios configured to use some of the RAM as it's graphics memory, a intel graphics feature on many laptops.

 

The other posters are right, the chance is very high that this person has a 32Bit OS installed which is physically incapable of seeing that amount of RAM.

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Just a couple of things to toss in there.

Have you made sure the memory is actually good? (MemTest86 ISO, whatever.)

Have you looked at Resource Monitor and checked if the memory is "hardware reserved?" Sometimes indicates a memory configuration not supported by the motherboard.

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On that Acer computer, it's probably using Shared Memory for the video card, hence not all of it is available to the OS.

 

Also, sometimes it's a limitation of the chipset on the motherboard.

 

 

Integrated video often reserves RAM no matter what OS you're running.

 

So back to what everyone else said, you need a 64 bit OS.

 

 

First of all, it is not my problem.. don't talk to me about it... Help OP...  

 

I am showing the example, that's all...  I have no idea OP has a desktop tower or laptop...

 

It could be BIOS settings or CMOS.   Or re-seat the RAM Sticks.

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10GB RAM sounds like a very strange amount to have installed.

Definately not reserved for GPU, no home GFX card uses 6GB of RAM.

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10GB RAM sounds like a very strange amount to have installed.

Definately not reserved for GPU, no home GFX card uses 6GB of RAM.

 

But not impossible.

 

HoodiBiY, how much RAM does the BIOS say you have? You should be able see that when you turn the computer on... or by pressing DEL, F2 or F12 directly after turning the computer on.

 

If the BIOS says you only have 4GB of RAM, try removing the 2GB module and see what happens.

If the BIOS says you have 10GB of RAM, it probably that you're using 32-bit Windows.

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It's something to do with the following:

32 bit Windows - reinstall a 64 bit version

DEP problems - disable DEP, enable PAE

Bad memory - check with memtest

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update bios

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Have you tried with just both 4 GB chips?

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Are you all daft? It's 99% that he's using 32-bit. Until he answers, please leave all these assumptions aside.

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Are you all daft? It's 99% that he's using 32-bit. Until he answers, please leave all these assumptions aside.

Typically he wouldn't even have that usable with 32-bit, so that's probably why there are other suggestions.   

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I have Windows-7 x64..!!!

BIOS says 10 GB.

Even Windows 7 detects 10 GB  but says (3.9 GB usable).More over this 10 GB of memory was working fine till last week.

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Take out the 2GB stick and make sure the 4GB sticks are running in the right channels.

 

You might also try the 4GB sticks separately to make sure they are both good.

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Enable 'Memory Remap' if it's listed in your BIOS.

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there's a thread on Corsair's forum that relates to your motherboard

http://forum.corsair.com/v3/showthread.php?t=114619

 

the memory finder on corsair.com doesn't even list your motherboard so it's possible that they no longer produce RAM that is compatible

http://www.corsair.com/en-us/memory-finder

 

--------

in the future, go with a different brand

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