I have 16GB RAM, Only half being used.

Bill Ellson

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Hi all. I built and have been running this system without an issue for about a year. Recently, I've noticed that when I open task manager, and look at my resources, Windows is only showing a maximum of 8GB of RAM. I have 16GB (4x4GB)of Corsair Vengeance 1600MHz installed.

On my last thread, Pinhedd suggested that I test all four DIMMs individually in the first slot, which I did, and all booted fine. He also suggested picking one of the DIMMs and testing it in each slot. All booted fine. I put all four DIMMs back in, and I still have 8GB in Windows. What is really weird is that my BIOS now show that I have 8GB installed, Windows shows that I have 8GB installed, but CPU-Z shows that I have 16GB installed. I'm not sure what's going on.

All four of my DIMMs are good. All four of my slots are good. What's the problem here, and why is it happening?!
 

Bill Ellson

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So why isn't it being detected if the slots work as well?
 

Tradesman1

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What's your mobo and CPU? Have you checked in MSCONFIG to see if the system is limiting DRAM - look in MSCONFIG>BOOT>ADVANCED and see if maximum memory is checked and limiting DRAM, also what OS version, some limit DRAM to 8GB max. If neither of the latter we're back to needing the mobo and CPU to check the DRAM set up
 

Bill Ellson

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I already attempted to change the max boot ram. The box is already unchecked, but I have tried checking it and putting in 16384MB, still no go.

Motherboard: EVGA Z77 FTW
CPU: Intel i5 3570k
OS: Windows 8.1 64Bit
 

Bill Ellson

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That's what I'm trying to say. All four sticks boot fine into windows, and show 4GB. Every single one.
 

Bill Ellson

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They all show up fine individually when they're booted up 1 at a time. But when all 4 are in, I only have 8GB, when it should be 16GB. That's the problem.
 

Bill Ellson

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Well, kajjot, my bios actually will not update. I have the first version. Whenever I try to update it, it gives me an error that I can't read, because my computer instantly restarts, and doesn't update. I've never updated the bios, and I had 16GB RAM before.
 

Lee-m

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I read over this quickly, and I didnt see what OS you are using (except that it is windows).
Its worth noting some versions of windows have ram limits. Win 7 home basic is limited to 8gb for example.

If that checks out, there is an issue with your motherboard not addressing all the ram, because as you state, all the sticks work individually.