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Different JEDEC count between two installed RAM. Is it ok?

I bought and installed two 4GB DDR3 RAM in my notebook (lenovo z480 with CPU intel core i5), both RAM have different brands but have same frequency (800 Mhz/PC3-12800). One is Corsair, another one is Hynix (formerly Hyundai).

However, they have different JEDEC count. Corsair has 3 JEDEC, while hynix has 4 JEDEC (see screenshot below).

The questions:
Would it give a problem if I use two RAM with different JEDEC count? Will it affect RAM performance?
Should I keep it like that or replace one to match the other?

And what is JEDEC anyway?


These are the screenshots from CPU-Z:

Slot #1 (Corsair)



Slot #2 (Hynix/Hyundai)
5 answers Last reply Best Answer
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  1. Best answer
    While it is always best to used matched pairs of RAM, there is no problem with those 2 DIMMS being used together.

    The only thing that it will do is slow the faster one down to match the slower.

    JEDEC is just a standardization test.
  2. itzdanielp said:
    While it is always best to used matched pairs of RAM, there is no problem with those 2 DIMMS being used together.

    The only thing that it will do is slow the faster one down to match the slower.

    JEDEC is just a standardization test.

    So in my case, which is faster between Corsair and Hynix?
  3. I found out Hynix is CL11 and Corsair is CL9, so is that mean Corsair is faster?
  4. Yes
  5. Best answer selected by shaltzer.
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