How to install two Ram with different CAS Latency(Timings) And different Sizes

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Kevi Bishal

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Mar 15, 2015
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Ok..so i have a biostar h61ml motherboard,which has two DDR3 slots..i have one stick of 2GB 1333Mhz ram already installed in it and thinking of another one stick of 4GB 1333Mhz,So i would have a total of 6GB..everything is the same except the brand,size,and CAS Latency(Timings) (i don't know about the voltage!) so can i mix those two ram and run it in single channel or dual channel (whatever it is)!!?
 
Solution
Tradesman1
If the two will play together it should run in Flex mode, you would have 2GB from each stick working in dual channel and the odd 2 GB from the 4GB stick running in single channel. There's no guarantee the two will play together, but chances are good, if they don't or aren't stable, give a shout and we can make a couple minor adjustments
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Tradesman1

Tradesman1

Legenda in Aeternum
Jun 5, 2013
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If the two will play together it should run in Flex mode, you would have 2GB from each stick working in dual channel and the odd 2 GB from the 4GB stick running in single channel. There's no guarantee the two will play together, but chances are good, if they don't or aren't stable, give a shout and we can make a couple minor adjustments
 
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Solution
B

brispuss

Splendid
Dec 27, 2014
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Hard to predict how the two modules will work as it depends on characteristics of the memory and on the sensitivity of the memory controller.

Try installing both modules, clear/reset CMOS and load BIOS defaults.

At best, the two modules will work in flex memory mode where 2 GB of the 4 GB module will operate in dual channel mode with the 2 GB module. And the remaining 2 GB of the 4 GB module will run in single channel mode. Frequency of the modules should be 1333 MHz. Timings will be at the slowest of the two modules. Voltage will be at the highest of the two modules.

At worst, the system may not even boot with both modules installed due to (excessive) variation in characteristics between the modules which the memory controller can't handle.

Ideally a dual channel kit should be used to ensure compatibility and to maximize memory bandwidth.
 
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