Win7 64bit Intermittent 4 of 8GB RAM recognized

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bluejayek

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Apr 3, 2013
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Hey all,

I am currently having a weird problem with my RAM. Sometimes, windows does not recognize all 8GB of my RAM. It will only recognize 4GB of it. It appears that when this happens, restarting my PC fixes this. I am at a loss to explain why this is, or how to fix it.

My system specs are:

ASUS P6T motherboard
4 x 2GB OCZ Platinum (default 1333MHz 7-7-7-20). Underclocked to 1160MHz, 7-7-7-20. QPI voltage 1.25V, DRAM voltage 1.64V
i7-960 overclocked to 3.6GHz. Core voltage 1.175V
HD5870 reference PCB graphics, no overclock.

Thanks for any help!

Edit: Added memory voltages
 
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bluejayek

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Apr 3, 2013
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Well, I didn't remove the sticks, but I changed my overclocking settings a bit.

Timings down to 8-8-8-24, memory speed at ~1300MHz, CPU at 3.5GHz. Increased QPI and cor voltage increased slightly.

Memtest recognized all of the RAM (as it always had) and ran error free for 15 hours. Prime95 ran stable for one hour.

So far windows has not booted and failed to recognize my RAM after these changes, but it hasn't been that long. Hopefully it was just a weird symptom of an unstable overclock and this fixed it!

Secondary question: after 15 hours running memtest, my graphics card was noticeably very warm to the touch. Is it normal for memtest to strain / heat the GPU? The RAM is near the GPU, so I suppose if it is getting *very* hot it MIGHT warm the GPU indirectly...
 
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bluejayek

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Apr 3, 2013
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10,860
No luck. Still seems to be happening; just noticed that windows is only recognizign 4GB this boot after Civ5 started lagging. I will take the RAM out now and 'clean' the contacts and try again.

My PC seems to keep lagging during this time that 4GB is recognized even after closing civ5 (now at 1.7GB/4GB used). Weird.

Any other suggestions?
 
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bluejayek

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Apr 3, 2013
281
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10,860
Update: After taking my RAM out this time and cleaning the contacts with isopropanol and a lint-free cloth (not that they were dirty), I realized that I had misread my mobo manual about the recomended slots to put ram sticks in. This may have been the problem.

For what its worth, when I booted this time windows is currently recognizing all my RAM. Iit was always been intermittent though, so this may not mean anything. I'm not even really sure whether it is usually booting recognizing only half RAM, or boots recognizing all of it and then 'loses' some of it somehow while running. I have only noticed that half the RAM was seen a few times when I started a bunch of programs / games up and noticed things slow down when they should not.
 
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