RAM upgrade compatibility (lenovo y720)

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vidmantenas

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Sep 27, 2017
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Hi, I got my Y720 15IKB (80VR) a few days ago. It's the base config model with a single 8gb ram stick of SK hynix 2400T. I'd like to upgrade to 16gb by adding another one of those to the empty slot. I hear that it's important to get an identical stick for optimal performance. The closest option in amazon seems to be pretty much the same, but it does have a few differences. On the bottom right side mine has UH NO AC 1705, while the amazon one has UH NO AB 1643. I've also found some other variations of the number (1622, 1640...)

So my question is: UH NO AC 1705 vs UH NO AB 1643. What do they mean and would the sticks work together ?

https://www.amazon.co.uk/Hynix-DDR4-RAM-2400Mhz-HMA81GS6AFR8-PC19400U/dp/B06ZZHGXQJ/ref=sr_1_fkmr0_1?ie=UTF8&qid=1506517683&sr=8-1-fkmr0&keywords=sk+hynix+2400T
 
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For a start, even getting another memory module with the exact same part number is not a guarantee that the two individual modules will work together due to variances in module characteristics. So, ideally a dual channel kit (with 2 x 8 GB modules) should be obtained instead as the two modules within the kit have been tested and guaranteed to be compatible with each other.

Those letters and numbers printed on the module label indicate production lot and date. This is not so important compared to other considerations such as module characteristics mentioned above. You could try this module and see if it works together with the existing 8 GB module, but there is no guarantee of inter-module compatibility. Also be prepared to try some...
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brispuss

Splendid
Dec 27, 2014
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For a start, even getting another memory module with the exact same part number is not a guarantee that the two individual modules will work together due to variances in module characteristics. So, ideally a dual channel kit (with 2 x 8 GB modules) should be obtained instead as the two modules within the kit have been tested and guaranteed to be compatible with each other.

Those letters and numbers printed on the module label indicate production lot and date. This is not so important compared to other considerations such as module characteristics mentioned above. You could try this module and see if it works together with the existing 8 GB module, but there is no guarantee of inter-module compatibility. Also be prepared to try some other (similar) modules until an inter-module compatible combination is found; this may take several attempts. All this means more time and money spent in finding compatible modules.
 
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