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: 12GB ram only 3.99GB usable


14 May 2011   #1

windows 7 professional 64 bit
 
 
12GB ram only 3.99GB usable

i recently installed 2 x 4GB ram chips but my pc doesnt "use" them.
Im running windows 7 64 bit.

Name:  ram2.jpg
Views: 324
Size:  25.1 KB

any advise on how to make the ram work?




My System SpecsSystem Spec
.

14 May 2011   #2

Windows 7 64 bit SP1
 
 

How does 2x4 = 12? Or do you mean you added an additional 2x4 to your existing 2x2?
My System SpecsSystem Spec
14 May 2011   #3

windows 7 professional 64 bit
 
 

yes i had 2 x 2 in and i added the 2 x 4
My System SpecsSystem Spec
.


14 May 2011   #4

Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz)
 
 

Are they the same brand, type, speed, etc ? a screen snip of CPU-z (memory) would help.

Also systen configuration (Advanced Options)


Attached Thumbnails
12GB ram only 3.99GB usable-cpu-z_amd-1100t_x6-mb-memory.jpg   12GB ram only 3.99GB usable-maximum_memory.jpg  
Attached Images
 
My System SpecsSystem Spec
14 May 2011   #5

Windows 7 64 bit SP1
 
 

Try swapping the memory modules so that the 4G's are in the current 2G channels and vice versa. Also, try removing the 2 2GB modules and see if you it gives you 8GB.
My System SpecsSystem Spec
14 May 2011   #6

Windows 7 Pro x64 (1), Win7 Pro X64 / WinXP Pro x86 on (2)
 
 

I suspect the new memory may not have matched the existing memory in terms of timings, etc.

How about downloading and installing CPU-Z, run it and then post four screenshots of the four memory slots using the SPD tab.

Also, post a screenshot of the Memory tab.

These should be very helpful in figuring out what's really going on.
My System SpecsSystem Spec
14 May 2011   #7

windows 7 professional 64 bit
 
 

I have tried to run the chips seperate... but it wont start with either of the 4 gb chips on it own

[ATTACH]12GB ram only 3.99GB usable-board.png[/ATTACH]


Attached Thumbnails
12GB ram only 3.99GB usable-mem.png  
My System SpecsSystem Spec
14 May 2011   #8

Windows 7 64 bit SP1
 
 

More than likely your memory is not compatible with your motherboard. You could try tweaking the voltage and other settings, but your motherboard likely has very specific requirements for memory. It looks like you have a P55 chipset which means you have to have memory that is designed for 1.5-1.65 volts. Can you post the specs of your new memory, or at least it's make and model number?
My System SpecsSystem Spec
14 May 2011   #9

windows 7 professional 64 bit
 
 

12GB ram only 3.99GB usable-untitled.jpg


My System SpecsSystem Spec
14 May 2011   #10

Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz)
 
 

Thanks for that last CPU-Z snip.

I think you need the 4gb sticks in slots 1 & 3 & the 2gb sticks in slots 2 & 4

They all look like the same speed but you have 3 diff mfgs of memory.
My System SpecsSystem Spec
Reply

 12GB ram only 3.99GB usable




Thread Tools



Similar help and support threads for2: 12GB ram only 3.99GB usable
Thread Forum
Windows 7 - 8GB ram only 3.99GB usable Hardware & Devices
Windows 7 12GB Installed (6GB usable) assistance Hardware & Devices
4gb installed 1.99gb useable??? Performance & Maintenance
Solved 12GB RAM only 8GB usable PC Custom Builds and Overclocking
12Gb RAM ok...16Bg Bsod's Hardware & Devices
12gb ram (9.99gb usable) Hardware & Devices
Corsair Ram 12Gb Installed (8.00Gb usable) 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 08:18 AM.
Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App
  

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33