Issue upon adding an additional kit of RAM

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morrowheat23

morrowheat23

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Nov 12, 2013
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I previously, around February, purchased an 8GB (4x2) kit of 1866 DDR3 G.Skill Sniper RAM from Newegg for my new upcoming build. The kit ran at 1600 at first, and I enabled XMP though my BIOS, which automatically changed the frequency to 1866. Around a week ago, I purchased the exact same kit through Newegg, to give me a total of 16GB of RAM (4x4.) However, upon booting, my BIOS notified me that some settings were incompatible with the new hardware (?) and so I disabled XMP, setting the RAM back to 1600. My PC booted as normal once this was done, and every time I attempt to set the RAM at its advertised 1866, which keep in mind worked with just the original 8GB kit, it fails to boot for the same reason. I have made no other BIOS changes regarding any part of my PC, and the BIOS has been flashed to its newest version.

Link to the kit:
Newegg
G.Skill Website
 
Solution
bgunner


I have found that AMD CPU's seem to need a bit more voltage to the RAM than what is on the label. This being said try upping the...
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bgunner

bgunner

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Feb 13, 2009
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First start by clearing the Cmos. Doing so will make sure the the BIOS rescans the hardware to ensure all pieces are detected. Next reset the BIOS settings and retry booting. If it fails again you will most likely have to increase the voltage for the memory controller. For AMD it is labeled as CPU-NB voltage but I am unsure what it is labeled as for Intel off the top of my head.

Also please list the full system specs so we can better help you with your issue.
 
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geofelt

geofelt

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Oct 9, 2006
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Ram is sold in kits for a reason.
A motherboard must manage all the ram using the same specs of voltage, cas and speed.
Ram from the same vendor and part number can be made up of differing manufacturing components over time.
Some motherboards can be very sensitive to this.
That is why ram vendors will NOT support ram that is not bought in one kit.

You are lucky that your ram is working.
Increasing the speed to 1866 will net you nothing in performance because you will need to run at higher cas numbers.

If you want to fiddle with it, try increasing the ram voltage in the bios a bit.
 
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morrowheat23

morrowheat23

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Nov 12, 2013
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Motherboard: Gigabyte GA-990FX-UD3
CPU: AMD FX-8350 @ 4.0 GHz
GPU: MSI R9 290X 4GB
RAM: 16GB G.Skill Sniper 1866
PSU: Corsair CX750M
 
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bgunner

bgunner

Judicious
Feb 13, 2009
5,144
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32,515


I have found that AMD CPU's seem to need a bit more voltage to the RAM than what is on the label. This being said try upping the voltage to 1.55V to start and then up to 1.57V. If you still can not boot then up the CPU-NB voltage by 1 step at a time up to a MAX of 1.3V and no more. Try to stay below this as over volting the mem-controller to far can cause premature CPU failure over time.

EDIT: you may also want to manually set the Ram speed and timings. I found on my Ram that 1 setting that got set using XMP profile was to much to run at eh 1866 speed. So also try setting just the 9-10-9-28 2N settings manually. This will leave the rest on auto and may possibly help with stability.
 
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