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

Last response: in Memory
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December 6, 2012 3:12:25 PM

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)

Best solution

a b } Memory
December 6, 2012 3:47:49 PM

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.
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December 7, 2012 1:12:09 AM

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?
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December 7, 2012 4:18:52 AM

I found out Hynix is CL11 and Corsair is CL9, so is that mean Corsair is faster?
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a b } Memory
December 7, 2012 1:10:26 PM

Yes
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December 7, 2012 3:48:05 PM

Best answer selected by shaltzer.
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