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RAM Dual-channel with different size

3S000
Beginner
9,363 Views

According to the Dual-channel with four DIMMs

https://www.intel.com/content/www/us/en/support/articles/000005657/boards-and-kits.html

 

 

I have some question about the size of RAM

If the DIMM 1 / DIMM 2 size for eg. 2 GB each (Both of them is the same)

  • Same brand
  • Same timing specifications
  • Same speed (MHz)

 

and DIMM 3 / DIMM 4 size for eg. 4 GB each (Both of them is the same)

  • Same brand
  • Same timing specifications
  • Same speed (MHz)

RAM in DIMM 1 /2 / 3/ 4 are the same memory channel speed.

 

 

My question is

 

  • When installing a RAM like this in different size - Is it

create a problem when using different size of RAM ?

 

  • When compare to 4 GB x2, Is 4GB x2 better than 4 + 2 + 4 +2 ?

Because the size in DIMM1/2 is not identical with DIMM 3,4

 

Thanks you.

 

 

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1 Solution
n_scott_pearson
Super User Retired Employee
8,785 Views

Yes, you are correct. That was a typo; I meant to say 'same' - but, in fact, that was incorrect.

 

If you follow the setup in your picture, you will achieve the highest throughput possible, namely dual-channel interleaved mode.. You want ChannelA-DIMM0 (DIMM 1 in this picture) and ChannelB-DIMM0 (DIMM 2 in this picture) to have matching size DIMMs. Similarly, for best performance, you want ChannelA-DIMM1 (DIMM 3 in this picture) and ChannelB-DIMM1 (DIMM 4 in this picture) to have matching size DIMMs.

 

So, to answer your original questions, no, size mismatch does not not create a problem and no, (4+2) + (4+2) will offer the same performance as 4 + 4. In fact, however, (4+2) + (4+2) will offer the better overall performance at the O/S (Windows, Linux, etc.) level simply because it makes 12GB available instead of 8GB.

 

I myself always like to go for the simplest solution, namely all DIMMs being the same size...😜

...S

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9 Replies
3S000
Beginner
8,785 Views

Note : CPU is i5-4590 @ 3.3GHz

Window 7 Ultimate

n_scott_pearson
Super User Retired Employee
8,785 Views

Mismatched DIMM sizes will slightly lower performance. DIMMs of same size must be in slots for ssme channel.

...S

3S000
Beginner
8,785 Views

Thank you for your reply. May I ask furthermore question about "ssme channel" What does it mean ?

According to the picture - If I install a RAM like this it will not be ssme channel, Am I understand correct ?

 

Note : A picture come from https://www.intel.com/content/www/us/en/support/articles/000005657/boards-and-kits.html

Dual chanel ram.jpg

n_scott_pearson
Super User Retired Employee
8,786 Views

Yes, you are correct. That was a typo; I meant to say 'same' - but, in fact, that was incorrect.

 

If you follow the setup in your picture, you will achieve the highest throughput possible, namely dual-channel interleaved mode.. You want ChannelA-DIMM0 (DIMM 1 in this picture) and ChannelB-DIMM0 (DIMM 2 in this picture) to have matching size DIMMs. Similarly, for best performance, you want ChannelA-DIMM1 (DIMM 3 in this picture) and ChannelB-DIMM1 (DIMM 4 in this picture) to have matching size DIMMs.

 

So, to answer your original questions, no, size mismatch does not not create a problem and no, (4+2) + (4+2) will offer the same performance as 4 + 4. In fact, however, (4+2) + (4+2) will offer the better overall performance at the O/S (Windows, Linux, etc.) level simply because it makes 12GB available instead of 8GB.

 

I myself always like to go for the simplest solution, namely all DIMMs being the same size...😜

...S

bhaskar
Beginner
8,092 Views

I want to know what will happen if I put 4GB(soldered)+ 8 GB(2nd slot) in the laptop(i3 8130U)...would it be better than 4+4 ....and will dual-channel work on 12 GB (4+8).

AlHill
Super User
8,084 Views

You should ask your laptop manufacturer that question.

 

n_scott_pearson
Super User Retired Employee
8,061 Views

Dual-channel support will be enabled regardless of whether you add a 4GB SODIMM or an 8GB SODIMM. The 8GB SODIMM will garner a better performing system simply as a result of the benefits of the additional 4GB of memory being available.

Hope this helps,

...S

bhaskar
Beginner
8,044 Views
3S000
Beginner
8,785 Views

Thank you very much. 😊

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