Dual channel + swap?
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Anonymous user
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Anonymous user -
Anonymous user -
Bonjour,
Despite all the information I have read about this, I could not find a clear explanation that explains this:
when using two 1 GB memory sticks in dual channel, and adding a third 1 GB stick, how is all this managed?
The first two still work in dual channel (please provide sources for your answers) and the third one in single...? (In this case, the bandwidth would equal the bandwidth of the 2 GB in dual combined plus the bandwidth of the third stick, all divided by two?)
Or do all three work in single mode, in which case the bandwidth would equal the bandwidth of a single stick?
I will take a super simplified example. Let's imagine that the bandwidth of one of these sticks is "1" (I’m just making this up for the example)
Whether we have ((1 + 1) + 1)) / 2 = 1.5
Or we have (1 + 1 + 1) / 3 = 1
This would mean that in all cases, it is more interesting to have 2 GB in dual + 1 stick in single than 3 sticks in single...
And it would mean that if we only had the 2 GB in dual we would have: 1 + 1 = 2 which would then be the best choice for performance?
And to complicate things further, what would be the best for performance:
2 GB in dual + 1 GB in single
or 2 GB in dual + 1 swap area on a hard drive...?
Thank you for your answers...
Despite all the information I have read about this, I could not find a clear explanation that explains this:
when using two 1 GB memory sticks in dual channel, and adding a third 1 GB stick, how is all this managed?
The first two still work in dual channel (please provide sources for your answers) and the third one in single...? (In this case, the bandwidth would equal the bandwidth of the 2 GB in dual combined plus the bandwidth of the third stick, all divided by two?)
Or do all three work in single mode, in which case the bandwidth would equal the bandwidth of a single stick?
I will take a super simplified example. Let's imagine that the bandwidth of one of these sticks is "1" (I’m just making this up for the example)
Whether we have ((1 + 1) + 1)) / 2 = 1.5
Or we have (1 + 1 + 1) / 3 = 1
This would mean that in all cases, it is more interesting to have 2 GB in dual + 1 stick in single than 3 sticks in single...
And it would mean that if we only had the 2 GB in dual we would have: 1 + 1 = 2 which would then be the best choice for performance?
And to complicate things further, what would be the best for performance:
2 GB in dual + 1 GB in single
or 2 GB in dual + 1 swap area on a hard drive...?
Thank you for your answers...
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13 answers
Hi
Some memory controllers offer dual channel (in English, Dual Channel) for memory. This involves using memory modules in pairs to combine bandwidth and thus maximize the system's capabilities. It is essential, when using Dual Channel, to use identical sticks in pairs (frequency, capacity, and preferably the same brand).
Source: https://www.commentcamarche.net/contents/764-ram-memoire-vive
Legend:
In the following article, memory slots are noted as indicated below:
Dual Channel: [A1-A2] and/or [B1-B2]
A1 = 1st slot (slot 1)
B1 = 2nd slot (slot 2)
A2 = 3rd slot (slot 3)
B2 = 4th slot (slot 4)
[A1-B1] = 1st group on the motherboard.
[A2-B2] = 2nd group on the motherboard.
-----------------------------------------------------------------------
It is possible to use memory sticks with the following frequencies in Dual Channel: DDR1600, 2100, 2700, 3200 and +
If you buy a single stick of RAM, then slot A1 must be configured in single channel mode.
If you want to use 2 sticks of different brands, then slots A1 and B1 must be configured in single channel mode only.
If you want to enable dual channel mode, it is necessary to use 2 identical sticks (same brand, same capacity, same frequency) in slots A1 and A2.
If you want to have 3 sticks of different brands, it is necessary to use 2 identical sticks in the first group (A1 and A2) and 1 stick of another possible brand but with the same frequency in slot B1.
Finally, if you wish to install a 4th stick in slot B2, it is essential to use a stick identical to the one in B1. Ideally, remove your stick from B1 and take 2 sticks identical to those used in A1 and A2.
Note that some old motherboards have 2 DDR2 ports and 2 DDR ports. Here, obviously, only the DDR2 ports can be used for Dual Channel.
Here is a copy of a fraction of an article from comment ça marche, signed la chance
DUAL CHANNEL = 2 not 3
Some memory controllers offer dual channel (in English, Dual Channel) for memory. This involves using memory modules in pairs to combine bandwidth and thus maximize the system's capabilities. It is essential, when using Dual Channel, to use identical sticks in pairs (frequency, capacity, and preferably the same brand).
Source: https://www.commentcamarche.net/contents/764-ram-memoire-vive
Legend:
In the following article, memory slots are noted as indicated below:
Dual Channel: [A1-A2] and/or [B1-B2]
A1 = 1st slot (slot 1)
B1 = 2nd slot (slot 2)
A2 = 3rd slot (slot 3)
B2 = 4th slot (slot 4)
[A1-B1] = 1st group on the motherboard.
[A2-B2] = 2nd group on the motherboard.
-----------------------------------------------------------------------
It is possible to use memory sticks with the following frequencies in Dual Channel: DDR1600, 2100, 2700, 3200 and +
If you buy a single stick of RAM, then slot A1 must be configured in single channel mode.
If you want to use 2 sticks of different brands, then slots A1 and B1 must be configured in single channel mode only.
If you want to enable dual channel mode, it is necessary to use 2 identical sticks (same brand, same capacity, same frequency) in slots A1 and A2.
If you want to have 3 sticks of different brands, it is necessary to use 2 identical sticks in the first group (A1 and A2) and 1 stick of another possible brand but with the same frequency in slot B1.
Finally, if you wish to install a 4th stick in slot B2, it is essential to use a stick identical to the one in B1. Ideally, remove your stick from B1 and take 2 sticks identical to those used in A1 and A2.
Note that some old motherboards have 2 DDR2 ports and 2 DDR ports. Here, obviously, only the DDR2 ports can be used for Dual Channel.
Here is a copy of a fraction of an article from comment ça marche, signed la chance
DUAL CHANNEL = 2 not 3
dual channel = motherboard factory-built for dual channel
dual = 2 identical modules if possible from the same brand and manufactured in the same batch
xp or vista only recognizes 3.7 GB
more = problems
dual = 2 identical modules if possible from the same brand and manufactured in the same batch
xp or vista only recognizes 3.7 GB
more = problems
Okay, so let's consider that we are talking about 3 sticks of the same brand, the question remains: how is it managed if there are 3 GB?
That’s okay, so you’re saying that if we put in 3 sticks of 1GB, they will all run in single channel?
In dual channel, if you put 512MB and 1024MB, it will take 512MB as the reference.
In single channel, if you put 512MB + 512MB + 1024MB, you will have 2048MB.
In dual channel, the memory sticks share the memory task, which leads to better performance.
See here
https://fr.wikipedia.org/wiki/Canal_double
In single channel, if you put 512MB + 512MB + 1024MB, you will have 2048MB.
In dual channel, the memory sticks share the memory task, which leads to better performance.
See here
https://fr.wikipedia.org/wiki/Canal_double
Hello,
I have the same question as webernard, and what I would like to know in a bit more detail than what the Wikipedia article specifies, alin44, is whether, with a total of 3 memory sticks that are absolutely identical in terms of brand, frequency, and capacity, the motherboard (for me an Asus K8V SE Deluxe) is capable of:
- Managing Dual Channel with two of the three sticks, plus a single channel with the remaining stick
- Or if, as soon as the three sticks are installed, the dual channel is simply canceled due to the third stick (which would be very unfortunate).
For example: Dual Channel(1024 + 1024) + Single Channel(1024),
or Single Channel(1024 + 1024 + 1024)?
The first and second slots of the motherboard being reserved for dual channel, out of a total of three slots.
Thank you.
I have the same question as webernard, and what I would like to know in a bit more detail than what the Wikipedia article specifies, alin44, is whether, with a total of 3 memory sticks that are absolutely identical in terms of brand, frequency, and capacity, the motherboard (for me an Asus K8V SE Deluxe) is capable of:
- Managing Dual Channel with two of the three sticks, plus a single channel with the remaining stick
- Or if, as soon as the three sticks are installed, the dual channel is simply canceled due to the third stick (which would be very unfortunate).
For example: Dual Channel(1024 + 1024) + Single Channel(1024),
or Single Channel(1024 + 1024 + 1024)?
The first and second slots of the motherboard being reserved for dual channel, out of a total of three slots.
Thank you.
HERE IS AN AUTOMATIC TRANSLATION OF AN ARTICLE IN FRENCH
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--
"The difference between genius and stupidity is that genius has its limits"
http://translate.google.be/...
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"The difference between genius and stupidity is that genius has its limits"
Thank you for these details, and especially for the last paragraph!
This would mean that with the Asus K8V SE Deluxe, which only has DDR slots and does not support DDR2, it is impossible to enable Dual Channel...
I didn't know that Dual Channel only worked with DDR2 technology; you are the first one I see mentioning it!
So on my end, I bought a Kingston ValueRam 1 GB DDR PC3200 stick, absolutely identical to the one I already had (except for the serial number and the manufacturing date ^^) and I tried all combinations of the two sticks in the three RAM slots of the motherboard, but the CPU-z software still indicates it's in "#single".
I was wondering why it wasn't working, but if what you say about DDR2 is true, then I understand, and goodbye Dual Channel!!
This would mean that with the Asus K8V SE Deluxe, which only has DDR slots and does not support DDR2, it is impossible to enable Dual Channel...
I didn't know that Dual Channel only worked with DDR2 technology; you are the first one I see mentioning it!
So on my end, I bought a Kingston ValueRam 1 GB DDR PC3200 stick, absolutely identical to the one I already had (except for the serial number and the manufacturing date ^^) and I tried all combinations of the two sticks in the three RAM slots of the motherboard, but the CPU-z software still indicates it's in "#single".
I was wondering why it wasn't working, but if what you say about DDR2 is true, then I understand, and goodbye Dual Channel!!
OK, still quite a bit of detail about this on the site: http://www.techimo.com/forum/motherboards/158338-ram-questions-does-asus-k8v-se-deluxe-support-dual-channel-mode-ram.html
To summarize: the Asus K8V SE Deluxe motherboard is equipped with socket 754, which only supports DDR. It is the newer socket 939 that supports DDR2 technology.
Ultimately: Asus K8V SE Deluxe = Single Channel
I know, this board must be at least 3 years old, but still, it’s a very good board :-)
Too bad!
++
To summarize: the Asus K8V SE Deluxe motherboard is equipped with socket 754, which only supports DDR. It is the newer socket 939 that supports DDR2 technology.
Ultimately: Asus K8V SE Deluxe = Single Channel
I know, this board must be at least 3 years old, but still, it’s a very good board :-)
Too bad!
++
Hello, I have an ASUS K8VSE deluxe motherboard.
I tried dual channel with 2 SAMSUNG cl3 bars sold together positioned in slots 1 and 2.
Only slot 1 recognizes the 1GB stick.
Example of tested configuration:
slot 1 2 3 observed result
1GB 1GB - slot 1 recognized at 1GB slot 2 = KO
512MB 512MB - OK dual channel tested by ASUS
512MB 1GB - OK but not dual channel
1GB 512MB - OK but not dual channel
I think the ASUS K8VSE deluxe manufacturer never tested dual channel with 1GB sticks and they probably didn't test the motherboard with 3 1GB sticks.
I asked ASUS for explanations, but I received no response.
I tried dual channel with 2 SAMSUNG cl3 bars sold together positioned in slots 1 and 2.
Only slot 1 recognizes the 1GB stick.
Example of tested configuration:
slot 1 2 3 observed result
1GB 1GB - slot 1 recognized at 1GB slot 2 = KO
512MB 512MB - OK dual channel tested by ASUS
512MB 1GB - OK but not dual channel
1GB 512MB - OK but not dual channel
I think the ASUS K8VSE deluxe manufacturer never tested dual channel with 1GB sticks and they probably didn't test the motherboard with 3 1GB sticks.
I asked ASUS for explanations, but I received no response.
Hello
for dual channel to work with 1 GB sticks, you actually need 2, so with 3 sticks, it doesn't work, got it...
And with one 1 GB stick plus 512 MB, it doesn’t work either,
so generally, to be in dual channel, you need a 1 GB stick in slots 1 and 3 or 2 and 4...
PS: I'm wondering if you've read this post, as it seems to be explained, doesn't it?
for dual channel to work with 1 GB sticks, you actually need 2, so with 3 sticks, it doesn't work, got it...
And with one 1 GB stick plus 512 MB, it doesn’t work either,
so generally, to be in dual channel, you need a 1 GB stick in slots 1 and 3 or 2 and 4...
PS: I'm wondering if you've read this post, as it seems to be explained, doesn't it?