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New MOBO/RAM not reading full amount of RAM


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#1 etavares

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Posted 26 January 2013 - 06:30 AM

Hi,

I recently purchased the GIGABYTE GA-X79-UP4 LGA 2011 Intel X79 SATA 6Gb/s USB 3.0 ATX Intel Motherboard and G.SKILL Ripjaws Z Series 16GB (4 x 4GB) 240-Pin DDR3 SDRAM DDR3 2133 (PC3 17000) Desktop Memory Model F3-17000CL9Q-16GBZH RAM for it. I placed the RAM in slots 1, 2, 3 and 4 per the instructions. It only reads 8GB in both BIOS and WIndows 7 x64. The BIOS reads the RAM in slots 1 and 3 but shows slots 2 and 4 as empty. I ruled out a bad RAM stick by swapping the odds and evens and it still only read 8GB, 4GB each in slots 1 and 3. Is there a BIOS setting I need to change, or is this a dead MOBO?

-etavares


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#2 Platypus

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Posted 26 January 2013 - 07:21 AM

Seems like it should all be handled automatically. Presumably the 4 channels are provided by two dual channel memory controllers, so I think the best approach would be to use the various two and three DIMM configurations as a process of elimination. If the even channels don't work in any of the permissible configurations, then it seems like a faulty memory controller...

Maybe examine the slots under a magnifier in case there are bent contacts touching, sliver of metal bridging contacts etc

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#3 etavares

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Posted 26 January 2013 - 07:48 AM

That's a good idea Platypus. I really hope the MOBO isn't shot...I hate the RMA process where I'm without a working computer for a few days. I'm transferring files now from my old hard drive, but will post the results of that testing later today. At least this computer is faster. :D


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#4 etavares

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Posted 27 January 2013 - 12:27 PM

The evens work in the 2-DIMM configuration. It read 8GB in slots 2 and 4. I just tried the 3-DIMM configuration with slots 1, 2, 3 and it's only reading 4GB. Any thoughts?


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#5 Platypus

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Posted 27 January 2013 - 06:27 PM

Something of a head scratcher - suggests something other than a controller fault. I don't suppose there's any chance of trying different memory? From the newegg link people have been getting Ripjaws with that board, but from general reading on forums I've always thought of G.SKILL as being a bit "cranky".

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#6 etavares

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Posted 27 January 2013 - 08:19 PM

I posted on the G.SKILL forum a few hours ago and one of the admins is helping me with the settings. No joy so far. I'll post back if we find something. Never had this happen before, so it's a headscratcher for me too. I assumed bad stick or bad MOBO...doesn't seem to be either right now.


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#7 etavares

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Posted 30 January 2013 - 09:39 PM

To close the loop, it turned out to be one bent pin in the socket. One mechanical pencil later and problem solved.


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#8 Platypus

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Posted 31 January 2013 - 04:52 AM

Good result! Glad it's sorted.

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