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.

38 comments:

  1. very informative & different one....
    I would like to share the information

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  2. This comment has been removed by the author.

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  3. Really nice to see people like you taking the time to put this in here, thanks. I would like to add that i am actually using exactly what u mentioned as not compatible on my laptop.
    My laptop specs are Toshiba L755-M1EJ and it came with only 1 stick of ram (Samsung m471b5273dh0-ck0) 4GB 2Rx8 PC3-12800S-11-11-F3 and i wanted to upgrade to 8GB in total so i added another 4GB stick which is (SKhynix 4GB 1Rx8 PC3L-12800S-11-12-B4) and is working perfectly since upgrading. so i stumbled upon this article because i got curious on Ram speeds and wanted to add this.

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    Replies
    1. This is exactly what I was looking for.
      I have Samsung 4GB, 12800S PC3 2Rx8 and I wanted to add another 4GB. To my surprise I couldn't find the same RAM in the market so I bought todau Samsung 4GB, 12800S PC3L 1Rx8.
      I hope it works fine.

      I see this is an year old comment, so is your Laptop still working fine?
      I hope so :-)

      Delete
  4. I'm holding a 1rx8. Four modules on one side, four on the other. The 2rx8 I have has 8 on each side. So...

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  5. Hi, hope you can reply to my comment here, im ongoing my fyp rite now, my laptop is having 4gb ram(SKhynix 4GB 1Rx8 PC3L-12800S-11-13-B4), theres one extra slot which needed to flip the ram to install it, if i buy the same ram as the one im using, will it run??

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  6. "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."

    I am confused with this, as I have seen Laptop RAM module with memory chip at double side with the tag 4GB 1Rx8 PC3L (Company name: hynix)

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  7. Can i place both ram 1rx8 and 2rx8 in same core to duo board or not plzzz give suggestion..

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  8. Hi, My laptop have 2 nos. 1GB RAM as mentioned below. Out of which 1 got corrupt. Can i use 2GB 2Rx8 PC2-6400S-666-12 in place of 1GB 2Rx16 PC2-5300S-555-12. So, that total RAM would be 3GB. Please suggest.

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  9. You have said:
    *****
    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.
    *****

    And it is not true. It does NOT mean that.
    1Rx8 means there is one rank/ "bank" of DRAM memory, which consist of 8 DRAM chips (64 bit/ x8 = 8), conected to the same DDR PCB bus.
    2Rx8 means there are two ranks/ "banks" of DRAM memory, which consist of 8 DRAM chips (64 bit/ x8 = 8), conected to the same DDR PCB bus. It means 16 DRAM chips on the DDR PCB are soldered. But it does NOT mean that they are soldered on one side or both sides.

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  10. "2Rx" basically means that your PC system will see this DDR RAM PCB as if it there two DDR RAM modules on the same slot/ bus. This way you can assemble 4 DDR RAM modules in two phisicaly awailable DDR RAM slots on your PC motherboard.
    There are 4Rx and 8Rx DDR RAM PCBs awailable to. But mostly for servers and high end PCs.
    You have to watch out for motherboard manufaturer limitations on how many RAM modules can be assembled on the same slot/ bus.

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  11. Hyper x fury 2rx8 16gb ra be used with same 1rx8 8 gb same 2666 mh

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  12. 2Rx8-16gb (2 stick) and 1Rx8 8gb (2 sticks) ram of same 2666mhz hyper x furry Ddr4 can be use simultaneously at a time

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  15. Wrong answer mate.PC3L can adjust the voltage to 1.35v from 1.5v.Thats the reason they are fit to pc3 slot.

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