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Message boards : Number crunching : Dual channel vs single channel RAM

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PappaLitto
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Message 48567 - Posted: 31 Dec 2017 | 17:08:30 UTC
Last modified: 31 Dec 2017 | 17:32:11 UTC

How much do you think two sticks of RAM vs a single stick of RAM affect the speed of these work units assuming all other variables are the same e.g. GPU, CPU, clock speed.

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Message 48570 - Posted: 31 Dec 2017 | 20:14:13 UTC - in response to Message 48567.

I would imagine considerably.

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Message 48572 - Posted: 1 Jan 2018 | 0:49:23 UTC

I see no immediate reason why two modules would slow down the performance, as a second module does not necessarily change the access time or timing. One thing which could reduce the access time is bus multiplexing due to a large memory size and therefore increased address range. That said, it is a matter of total RAM size but not dependent on the particular configuration (e.g. either using 2x8G or 1x16G modules). Another thing is an eventual signal interference on the bus having all banks used, which may require a slightly slower timing. But again, that normally is not the case with two banks.
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Message 48573 - Posted: 1 Jan 2018 | 6:14:53 UTC - in response to Message 48572.

I was thinking one stick of RAM would be considerably slower than two due to the single channel he would have with one stick.

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Message 48574 - Posted: 1 Jan 2018 | 13:39:34 UTC - in response to Message 48573.

I was thinking one stick of RAM would be considerably slower than two due to the single channel he would have with one stick.


In general yes but it depends on the motherboard and how old it is. In some computers if you have different sized ram sticks it's helpful to put the bigger ones closer to the cpu because it uses them in order and if it fits on one stick, rather than spilling over to the next one it's somewhat faster.

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Message boards : Number crunching : Dual channel vs single channel RAM