New identical RAM with higher capacity causes restart loop before entering BIOS

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geky

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May 10, 2013
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Hello,

I have a gigabyte Mobo (Z77) that supports 4 RAM DDR3 Dimm sticks.
I have originally installed 4 identical Geil RAM modules (4x4GB=16GB) of 16 GB in total.

I decided to upgrade and bought 2 identical Geil RAM modules (2x8=16GB) of 16GB in total.

The idea was to install 2x8 + 2x4 = 24GB of memory in total (of course in matching dual channel configuration according to MoBo manual)

Unfortunately the above configuration (even when trying to seat the modules in various allowed by MoBo Dimm slot configurations) causes the PC to go into restart loop (just keeps on restarting before hearing any beeps from the system) before being able to access the BIOS.

The 2x8 GB modules are working when installed on their own in 2 dimm slots
The 4x4 GB modules are also working when installed on their own in 4 dimm slots

The timings are identical to all modules: 9-9-9-24. Voltage also identical at 1.5 volts.

Any idea maybe? Would be great if I manage to upgrade and achieve the 24GB in total that I have in mind.

Thanks in advance for any helpful solutions.
Geky
 
Solution
Tradesman1
Yes, can try the DRAM voltage increase to help them try and play (perfectly safe), but even if they were the same exact identical model there's no guarantees they will play nice, DRAM in a package has all been tested to ensure the sticks will play.
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G

geky

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May 10, 2013
29
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10,530


Using Windows 8.1 64bit
 
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Tradesman1

Tradesman1

Legenda in Aeternum
Jun 5, 2013
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Start with just the 2x8GB in slots 1-3 from CPU, if 1600 or better - enable XMP select profile 1, then raise DRAM voltage + 0.06, save shutdown, try adding the old and let us know what it does. May just not be compatible, not a good idea to mix packages of DRAM - No guarantees
 
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G

geky

Honorable
May 10, 2013
29
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The modules are identical apart from capacity (8 versus 4 GB).
They are all 1333MHz, so no XMP is required.
The modules run at 1333MHz and 1,5V by default (auto setting at BIOS sets all the modules to run at 1333MHz, 1.5V, 9-9-9-24 timings.)
Therefore: Do I still need to manually enter the values (1333MHz, 1.5V, 9-9-9-24) at the BIOS

Could it really be RAM incompatibility?
 
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Tradesman1

Tradesman1

Legenda in Aeternum
Jun 5, 2013
67,883
40
126,960
Yes, can try the DRAM voltage increase to help them try and play (perfectly safe), but even if they were the same exact identical model there's no guarantees they will play nice, DRAM in a package has all been tested to ensure the sticks will play.
 
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Solution
G

geky

Honorable
May 10, 2013
29
0
10,530


Ok thanks.
I will manually enter the voltage in BIOS; 1.506V for both channels.
I will let you know the results.
Cheers,
Geky
 
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