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Tom's Hardware > Forum > Motherboards & Memory > Memory > [Solved] Nvidia 780i - slots 1 and 3 suddenly not working?

[Solved] Nvidia 780i - slots 1 and 3 suddenly not working?

Forum Motherboards & Memory : Memory [Solved] Nvidia 780i - slots 1 and 3 suddenly not working?

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moarmin   01-26-2012 at 06:44:58 AM

Hi all,

My system (nvidia 780i SLI motherboard, all 4 DIMMS filled with 2GB Mushkin PC2-6400) was running fine for 2.5 years, until yesterday when it shut down. On reboot, I was getting C1 errors, suggesting something about the memory was no longer happy.

From the CPU side, this motherboard identifies its DIMM slots as 0 and 2, then 1 and 3. Running Memtest, I learned:

1. Individually, all 4 memory sticks successfully pass memtest in slots 0 or 2.

2. Individually, they each fail in slots 1 or 3.

3. I can put 2 sticks into slots 0 and 2 and pass, but because that's not the correct matching slot pair, the system thinks only 2 gigs are on board. Matching pairs are 0 and 1, 2 and 3.

4. Adding a third or fourth stick into 1 and/or 3, and I'm getting the C1 error again.

After, I tweaked the memory voltage up a bit, from 1.8 to 1.95v, even upping the north bridge to 1.4v. And tuned down the timing to 5/5/5/18/2T. No change, switched it back to defaults.

So, all 4 sticks seem fine, but slots 1 and 3 (the two furthest from the cpu) are suddenly unhappy. Bad memory controller on the motherboard, then? Is there anything I can do?

And even if not, is there a way I can get the mobo to recognize both 2 gig sticks sitting in non-paired slots 0 and 2?


Thanks for any help. Cheers.


Message edited by moarmin on 01-26-2012 at 05:20:45 PM
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clutchc   02-07-2012 at 04:28:58 AM
Best answer

It appears you've proven your memory controller has failed. You may have to 'bite the bullet' and get a new or used board.

------------------------------ i5-2500K 3.3GHZ, Hyper 212 EVO, Gigabyte Z68XP-UD3P Board, 8GB 1333MHZ G.Skil Sniper, 2 x GTX 570 SC SLI, Crucial M4 SATA3 64GB SSD, WD 500GB HDD, X-FI Titanium, XFX 850W PSU, 32" @ 1920x1080
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Nikorr   02-14-2012 at 03:17:07 PM

This topic has been closed by Nikorr

------------------------------ Where there's smoke, there's fire...

 

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