Only 8GB of 16GB shows in Bios/Computer

Hi all,

I'm completely stuck; I have 4 sticks of 4GB Corsair memory in my computer. However in both Bios and in Computer it is only showing a total of 8GB.

When the computer was new it did correctly show 16GB (3 weeks ago).

I don't know when it went wrong, but I have booted it happily off each stick and with any combination of 2 it shows 8GB, which leads me to believe that there must be a mother board related issue, whether that's because it's broken or there's some spectacularly obvious thing I'm missing.

Does anybody have any ideas?

Many thanks.


- The mobo does support 16GB
- It's Windows 7 64-bit

what version of windows 7?

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Originally Posted by Blackmage

what version of windows 7?

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Windows 7 64-bit (I did write it above just in case anybody thought I was only on 32-bit hence it would only show 3GB).

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Originally Posted by Shmee150

Windows 7 64-bit (I did write it above just in case anybody thought I was only on 32-bit hence it would only show 3GB).

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Home basic, Pro, ultimate etc?

http://msdn.microsoft.com/en-us/libr...mits_windows_7

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Originally Posted by Blackmage

Home basic, Pro, ultimate etc?

http://msdn.microsoft.com/en-us/libr...mits_windows_7

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Windows 7 Professional 64-Bit

That suggests it should support 192GB. But isn't the problem above the software as the bios also reports just 8GB.

You tested each mobo slot?

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Originally Posted by snootyjim

You tested each mobo slot?

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Ahh no, good idea. Should I take a single stick and run it through each slot seeing which work?

Is it the system in your sig or a different one? There were some ASUS boards that were having this issue and they pushed several BIOS versions to try and fix it.

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Originally Posted by Agent

Is it the system in your sig or a different one? There were some ASUS boards that were having this issue and they pushed several BIOS versions to try and fix it.

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It's the one in my signature. Shuttle's website offers a few newer BIOS versions but none mention anything to do with Ram issues: http://global.shuttle.com/products/p...Id=1389&osId=7

As it happens, it has now (or rather I've only just noticed) started having USB issues; if I try to copy data to or from any device via a variety of plugs it disconnects and reconnects. (ETA: Now noticing that it's dropping in and out with keyboard and mouse too)

Sounds increasingly like my motherboard has nuked itself I think.

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Originally Posted by Shmee150

Ahh no, good idea. Should I take a single stick and run it through each slot seeing which work?

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Originally Posted by Shmee150

Sounds increasingly like my motherboard has nuked itself I think.

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Yes, and yes :(

Well, not for certain, obviously, but that doesn\'t sound good at all.

Without wanting to pour water on the fire, both of the Shuttles I owned had their mobos die within a couple of years.

Not that much of a fan of them now given that there are some really nice Silverstone cases and good MATX boards about. Granted, a tad bigger, but the expandability and ease of upgrades is worth it to me.

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Originally Posted by Agent

Without wanting to pour water on the fire, both of the Shuttles I owned had their mobos die within a couple of years.

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Yup, my last motherboard popped a few weeks ago after 3 years of good service. Although my other Shuttle is 4 years on and still going strong. This one at only 3 weeks clearly has some sort of issue but I tend to take it around and about with me a fair bit so it's amazingly easy to just put it in a Shuttle bag and head off.

Have submitted an RMA as it seems that the 3rd and 4th ram slots are dead, no idea what the USB issue is about.