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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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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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Note : CPU is i5-4590 @ 3.3GHz
Window 7 Ultimate
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Mismatched DIMM sizes will slightly lower performance. DIMMs of same size must be in slots for ssme channel.
...S
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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
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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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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).
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You should ask your laptop manufacturer that question.
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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
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Thank you very much. 😊

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