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I have a situation where I have a system with 16 GB of physical RAM, but at the BIOS level only 8 GB are detected. There are 4 sticks of G.Skill Ripjaws 4 GB DDR3 1600 MHz RAM. The motherboard is an ASUS P8B75-V LGA 1155 with an Intel Core i7-2600K Sandy Bridge. I built this system in 2012.

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I have taken all RAM sticks out and then one by one I have tested them individually on all RAM slots on the motherboard. All sticks work on all slots and 4 GB is detected by the BIOS. All RAM sticks seem to be good and so are the RAM slots on the motherboard. Only when I have more than 2 sticks inserted is when the BIOS does not detect anything beyond the 8 GB.

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My OS is ArchLinux, but that is not relevant here because the BIOS does not detect the full 16 GB of RAM.

Any ideas or obvious settings that I am missing in the BIOS configuration?

  • well i checked the mobo website, that ram should work – Keltari Mar 7 '18 at 9:52
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According to Intel i7 2600K specification your processor doesn't support DDR3 1600 MHz chips (only DDR3 1066/1333). This may cause compatibility problems.

I had similar problem at laptop. When I change Ram for slower it solved problem.

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    Good thought. I checked the mobo, which supports that memory, but I didnt think to check the CPU. – Keltari Mar 7 '18 at 9:59
  • Oh yea, my sandybridge 2500k used DDR2. – psusi Mar 7 '18 at 16:32
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    @lluke excellent point and i was not aware of that. I must point out that this bios/mobo did detect the full 16 gb up until 6 months ago. – λ Jonas Gorauskas Mar 9 '18 at 23:27
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Your screenshot shows that your BIOS version is quite old. The latest BIOS would be version 1608.

I recommend updating the BIOS first before checking other possibilities.

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  • Excellent point and i will try a bios upgrade this weekend – λ Jonas Gorauskas Mar 9 '18 at 23:28

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