16 GB of RAM reading as 7.96

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Sceritz

Distinguished
Jun 22, 2013
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OS: Windows 7 Ultimate
The problem is Windows System Settings showing my RAM as 16GB with only 7.96 Available

MB: 970a-DS3
CPU: AMD FX-8320 8-Core 3.5ghz
RAM: Originally a single 8GB stick, just added a second 8BG stick.
First Stick: http://www.newegg.com/Product/Product.aspx?Item=N82E16820104338
New Stick: http://www.newegg.com/Product/Product.aspx?Item=N82E16820104450

What I've done:

Re-seated the RAM
Changed Dual Channel positions (two possible combos)
Check the msconfig settings
Updated Chipset
Bios is up to date

Bios recognizes all 16GB's. I haven't touched any voltage settings. That's Pretty Much it, not sure what the problem could be. Ram's been relatively simple in the past.
 
Solution
Tradesman1
Try starting with only the Fury stick in slot 1, it should set itself up for you as it runs off PnP (the Blu RRed stick is different and runs under XMP), change the setting for DRAM from auto to manual, and increase the DRAM voltage to 1.56, save exit shutdown. Then install the Blu/Red stick and give it a try. Think they should work, if no joy go back to BIOS and raise the CPU/NB voltage to 1.25, if still no joy, am guessing they just aren't going to play. Mixing DRAM is a crapshoot, it's normally a 50/50 if they will play are not, but a little less when trying to mix PnP and XMP based sticks
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Tradesman1

Tradesman1

Legenda in Aeternum
Jun 5, 2013
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Try starting with only the Fury stick in slot 1, it should set itself up for you as it runs off PnP (the Blu RRed stick is different and runs under XMP), change the setting for DRAM from auto to manual, and increase the DRAM voltage to 1.56, save exit shutdown. Then install the Blu/Red stick and give it a try. Think they should work, if no joy go back to BIOS and raise the CPU/NB voltage to 1.25, if still no joy, am guessing they just aren't going to play. Mixing DRAM is a crapshoot, it's normally a 50/50 if they will play are not, but a little less when trying to mix PnP and XMP based sticks
 
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Solution
Geekwad

Geekwad

Admirable
Sep 25, 2015
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Double check that you have the two sticks in the correct two slots according to your mobo manual.

Saving that, headline (marketed) CAS Latency is only one important memory timing to take into consideration, and this is rather common when putting together unmatched memory sticks (i.e. they didn't come as a pair or set).

Looking at the spec sheet for your two sticks:

http://www.kingston.com/dataSheets/HX316C10FR_8.pdf
http://www.kingston.com/datasheets/KHX16C10B1R_8.pdf

Shows that they are not a perfect match, even though they are both CL10 1600 8gb sticks from the same manufacturer.

As a result, it may be necessary to 'fine tune' the memory timings in the UEFI/BIOS to get them to work well together. I would recommend adjusting the one with a 800MHz fCK to try to get it to match the 667MHz fCK performance.

This may give you a place to start:

http://us.hardware.info/reviews/5993/workshop-memory-overclocking-get-the-most-out-of-your-modules!

If fiddling with RAM timings in your UEFI/BIOS is overwhelming, then I would advise, if you can, returning the FuryX you just got and get a matched 16GB set.

 
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Sceritz

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Jun 22, 2013
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I actually thought I was being careful by buying same brand, same speed same manufacturer. Guess I should be more careful. Before I saw this I bumped the voltage to 1.65. That didn't work.

I left the voltage there and switched the sticks Surprisingly that DID work (I thought I switched the slots used but not which came first. Didn't even realize I hadn't tried that). Not sure why it worked though. Something to do with the newer version being PnP? Wanted to take precedence? *shrug* Either way. Should I lower the voltage back down to 1.5? I was considering trying to clock it to the 1600mhz they are supposed to run at. The system puts them at 1333 by default.

Either way thanks! If I didn't switch them I would've saw this and definitely went back to do so.
 
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