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I have seen similar questions and answers but mine is:

a. I have 8GB RAM installed

b. My BIOS shows 4GB

c. Ubuntu's System Setting/Details shows 3.7GB (but this small decrease is not a great issue for me)

Question:

Is this a possible Ubuntu issue or it has to do with my pc hardware (faulty memory, etc..)? Sorry, I am a noobie, but what I mean is: if it should be an Ubuntu issue, would the BIOS show the right RAM amount (8GB)? Or Ubuntu "affects" also what is shown in the BIOS settings?

Thanks a lot in advance for your patience and for your help with this.

Alex

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1 Answer

If the BIOS shows only 4GB, it's a hardware problem. One of your chips is not working, or quite possibly, one of your chips is not properly seated. (Or you actually have 4GB.)

Under Linux, the command sudo dmidecode -t 6 (from the dmidecode Install dmidecode package) will tell you which memory banks have a chip connected and what size chip. If some banks are reported empty but you think there is a chip in them, take the cheap out and insert it back, making sure to seat it properly.

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I have dual-bank motherboard and I made sure each of the 4GB module was seated into a same colour bank. However, it shows only as "single bank" connected. Could that be the problem? Here is an excerpt (only one bank) from dmidecode: Handle 0x0006, DMI type 6, 12 bytes Memory Module Information Socket Designation: A0 Bank Connections: 1 Current Speed: Unknown Type: Other Installed Size: 2048 MB (Single-bank Connection) Enabled Size: 2048 MB (Single-bank Connection) Error Status: OK –  AlexdM Mar 18 '13 at 10:49
    
@AlexdM This output is from a 2GB module. Do you have 2x2GB? 4x2GB? Evidently you don't have 2x4GB! –  Gilles Mar 18 '13 at 13:04
    
@AlexdM I still think you have 2 modules of 2GB each. What makes you think otherwise? –  Gilles Mar 19 '13 at 1:34
    
Hi Gilles, thanks for replying. Well, I think otherwise because I had in my hands 2 x 4GB Modules like these (corsair.com/us/memory-by-product-family/xms-classic/…), that is what I have installed. –  AlexdM Mar 19 '13 at 9:48
    
@AlexdM You linked to a 4GB kit, consisting of two 2GB modules. –  Gilles Mar 19 '13 at 12:55
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