Sunday, January 15, 2017

What does the 1Rx8 mean vs. 2Rx8 for RAM and are they compatible?

Q = Are a 4GB 1Rx8 PC3L 12800S and a 4GB 2Rx8 PC3 12800S compatible? What do 1Rx8 and          2Rx8 mean? Can I put them together?

A = 1Rx8 means the memory chips are on one side of the RAM module and 2Rx8 means the memory chips are on both sides of the RAM module.
Compatibility is generally not an issue in most cases. But you should go through the motherboard manufacturer's guide of supported RAM modules just to make sure if they are compatible or not.
Coming to the PC3 and PC3L part, PC3 RAMs requires an operating voltage of 1.5V whereas PC3L requires an operating voltage of 1.35V. The 'L' in PC3L signifies Low Voltage. So using PC3 RAM in a PC3L RAM slot will not provide it sufficient voltage and it will fail to operate. On the other hand using a PC3L RAM in a PC3 RAM slot may damage it due to overvoltage. So PC3 and PC3L RAMs are not compatible with each other.
So in short 1Rx8 PC3L 12800S and 2Rx8 PC3 12800S RAMs are not compatible with each other. But if it is only the 1Rx8 and 2Rx8 in concern, they may be compatible with each other but it's best to check the motherboard manufacturer's list of compatible RAMs.

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