Computer startup issue after ram install

PillsburyJOEboy · Dec 20, 2015

Hi there fellers.

I have a question about what is stated in the title. I have built a new system and everything runs fine. I added 16gb more ram of the exact same kind. Now when I start up it crashes one time, then proceeds to startup and function normally. Just worried that this could mean something is not right, but I'm not sure. My setup is as follows:

i7-4790k
ASUS Maximus VII Hero
2x gtx 780 sli
and the kicker 32gb (now) Corsair 1866mhz ram

Any advice is appreciated.

Luminary · Dec 20, 2015

Even adding the exact same model of RAM from different packs can create issues. I'd recommend running Memtest, reseating your RAM would also be a good idea:

Link to MemTest download: http://www.memtest86.com/

Excerpt from the Tom's Article 'The Most Common DDR DRAM Myths Debunked' on why even mixing RAM of the same model might not work well:

"Even though you are buying two of the exact same sets, there is no guarantee that they will work together. The DRAM that goes into a package has been tested to work together. Manufacturers don’t guarantee mixing or adding one set to another, even when they are the same exact model.

Customers often try this with higher data rate sticks using XMP to set them up. With XMP enabled, the motherboard may read the profile for two sticks of DRAM and set the secondary timings accordingly, but the tRFC timing for two modules may be 226, whereas four sticks require 314. This can be especially hard for most users to troubleshoot/find, as few ever go into the secondary DRAM timings."

RARRAF · Dec 20, 2015

maybe the bios needs updating might help

PillsburyJOEboy · Dec 20, 2015

From my understanding of it, ram had to be purchased together for using one channel. Mine has dual channel, so I purchased 2x8gb when I first built it and another 2x8 recently. Is that not the case? About to try the mem test

Luminary · Dec 20, 2015

The single channel/ dual-channel architecture doesn't affect mixing RAM, if you mix there is always a risk of incompatibility, even if you mix in pairs.

Tradesman1 · Dec 20, 2015

Try rasing the DRAM voltage + 0.05 and the CPUVTT (may be DDRVTT) about the same

PillsburyJOEboy · Dec 20, 2015

It appears I had it on an XMP profile for some reason? Not sure why it was set there. I thought I left the ram alone. It had lowered voltage and I think that was throwing it off. Set it back to auto and haven't had trouble since.

Tradesman1 · Dec 20, 2015

If on AUTO you are prob running at 1333 or maybe 1600, if you want 1866 will need XMP or set up manually and prob need the voltage adjustments suggested above

PillsburyJOEboy · Dec 20, 2015

When I set it to auto it says 1866. Is this not the case?

Tradesman1 · Dec 20, 2015

Then it's still using the XMP settings, try the voltage changes

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Computer startup issue after ram install

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