Choosing memory Cards

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mrhoracemann

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Nov 16, 2012
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I have a Acer Aspire T
The data sheet for it is
https://www.acer.com/datasheets/2014/4871/TC-120/DT.SV8AA.005.html
It has 4 memory slots and 3 of them are filled with
4GB 1Rx8 PC3L-12800U-11-13-A1

I have a few questions about filling the 4th slot.
1) do I have to match what is already there exactly? Can I add an 8g stick. Or do I need to match the sticks in pairs?
What about the rest of the numbers.
1Rx8 PC3 12800U
Do I need to match the 12800U.
I saw a 12800R. What is the U an R?
How about the 11-13?
I saw a few 11-12s what is the 12 vs the 13?
 
Solution
alceryes
First of all, having 3 sticks (instead of 2 or 4) is dropping the system out of dual channel mode and maybe slowing down the memory Mhz speed. When memory is not installed in 'sets' MBs usually drop down into a slower compatible mode.

The "U" stands for unbuffered. Which is standard for desktop/gaming/home office systems.
Although it's not guaranteed to work, here is the stick you described above on ebay for $25 - http://www.ebay.com/itm/Samsung-4GB-1Rx8-PC3L-12800U-11-13-A1/302416811650?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D1%26asc%3D46086%26meid%3Da8090599b8de480699955124fab7fc67%26pid%3D100011%26rk%3D4%26rkt%3D12%26sd%3D112332847541&_trksid=p2047675.c100011.m1850

Remember that only sticks sold together in a kit are...
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alceryes

alceryes

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Jun 11, 2004
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First of all, having 3 sticks (instead of 2 or 4) is dropping the system out of dual channel mode and maybe slowing down the memory Mhz speed. When memory is not installed in 'sets' MBs usually drop down into a slower compatible mode.

The "U" stands for unbuffered. Which is standard for desktop/gaming/home office systems.
Although it's not guaranteed to work, here is the stick you described above on ebay for $25 - http://www.ebay.com/itm/Samsung-4GB-1Rx8-PC3L-12800U-11-13-A1/302416811650?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D1%26asc%3D46086%26meid%3Da8090599b8de480699955124fab7fc67%26pid%3D100011%26rk%3D4%26rkt%3D12%26sd%3D112332847541&_trksid=p2047675.c100011.m1850

Remember that only sticks sold together in a kit are guaranteed to work together. Although, usually, in desktop systems where you aren't OCing or pushing timings, you have a good chance of them working fine together.
 
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