Windows recognizes 16GB Ram but only 7.9GB usable. Bios recognizes only 8GB.

walrath21

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Dec 18, 2013
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My System specs:
Sabertooth 990FX R2.0
Nvidia GeForce GTX 770
AMD FX-8350 8-core processor
2x8GB Ripjaws DDR3-1600
2x4GB Ripjaws DDR3-1600
Windows 7 Professional x64


I have updated the Bios to the newest version. All the DIMM slots have been cleaned with compressed air. There is no ram cap in msconfig. Both ubuntu and windows recognize only 8GB. I have reset cmos using the jumper and by removing the battery.

I took out all of the ram and only inserted the 8gb stick in each slot. On each slot there was only 4GB recognized. This happens with both sticks of 8GB. When both 8GB sticks are inserted, staggered, it recognizes 8GB.

After testing, one of the 4GB sticks doesn't work on A1 or A2 and I presume that it is broken from only those two. The other 4GB stick shows as 4GB in bios. As a result I will try to just get the 2 8GB sticks working in dual mode.


Sometimes I get a screen before bios that says overclocking failed! However I did not set any overclocking.

Please let me know if you more information is needed to solve this problem. Thank you for reading.

UPDATE: Contacted Asus and they said this Ram is not compatible with the motherboard? I used pcpartpicker as a compatibility checker. This is what they said "That chipset and architecture does not allows for the correct timing sequencing between RAM addresses for this RAM. " Can anyone confirm this? Thank you.
This is the RAM
https://pcpartpicker.com/product/LzTmP6/gskill-memory-f312800cl9d8gbxl
 

elbert

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Jan 11, 2005
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First make sure you have the latest bios. If that doesn't work then try swapping around the RAM to see if you can get more RAM. Also put the 16GB kit in bank 0.
https://www.asus.com/Motherboards/SABERTOOTH_990FX_R20/HelpDesk_Download/
 

walrath21

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Dec 18, 2013
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I already updated to the latest bios. Unfortunately there was no change. Do you know why bios would only recognize 4080mb for both 8gb sticks and in any slot?
 

elbert

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Compatiblity with the bios which is why I suggest the update motherboard bios. If the bios update didn't fix then that is a really odd issue.
 

jacobnelson920

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Oct 4, 2017
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Reference your user manual for 2 pieces of information. 1. Make sure that your RAM is installed properly (in the correct DIMM slots). 2. Make sure that your BIOS is configured properly for the RAM to function (see the section about the BIOS if you are unsure of what something does, or use a quick Google search).
 

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