To be clear, a CoreDuo or iSeries CPU chip RAM I/O channel can get complex! As the different series offer different channels.
So in the case of a CoreDuo it’s a single channel for the two SO-DIMM sockets. Then it’s only making sure the RAS & CAS spec of the RAM is compatible across.
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With iSeries this is the same for laptops, but desktops it’s different!
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With iSeries CPU’s this is the same for laptops, but desktops it’s different!
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Here we have the concept of [https://en.wikipedia.org/wiki/Memory_bank|Memory Bank] & [https://en.wikipedia.org/wiki/Multi-channel_memory_architecture|Channel] both of which can offer [https://en.wikipedia.org/wiki/Interleaved_memory|Interleaved memory].
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Here we have the concept of [link|https://en.wikipedia.org/wiki/Memory_bank|Memory Bank] & [link|https://en.wikipedia.org/wiki/Multi-channel_memory_architecture|Channel] both of which can offer [link|https://en.wikipedia.org/wiki/Interleaved_memory|Interleaved memory].
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As a rule of thumb a bank needs to hold the same RAM modules (ideally same vendor) and if the RAM is interleaved then the banks or channels need to support the same RAM, otherwise a Bank or Channel which is not interleaved can support different RAM sizes. In some systems the given channel must hold the same RAM, but a different channel can support a different RAM sizes. Give this a read [https://support.apple.com/en-us/101639|Install and replace memory in your Mac Pro (2019)] talk about confusing!
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As a rule of thumb a bank needs to hold the same RAM modules (ideally same vendor) and if the RAM is interleaved then the banks or channels need to support the same RAM, otherwise a Bank or Channel which is not interleaved can support different RAM sizes. In some systems the given channel must hold the same RAM, but a different channel can support a different RAM sizes. Give this a read [link|https://support.apple.com/en-us/101639|Install and replace memory in your Mac Pro (2019)] talk about confusing!
To be clear, a CoreDuo or iSeries CPU chip RAM I/O channel can get complex! As the different series offer different channels.
So in the case of a CoreDuo it’s a single channel for the two SO-DIMM sockets. Then it’s only making sure the RAS & CAS spec of the RAM is compatible across.
With iSeries this is the same for laptops, but desktops it’s different!
Here we have the concept of [https://en.wikipedia.org/wiki/Memory_bank|Memory Bank] & [https://en.wikipedia.org/wiki/Multi-channel_memory_architecture|Channel] both of which can offer [https://en.wikipedia.org/wiki/Interleaved_memory|Interleaved memory].
As a rule of thumb a bank needs to hold the same RAM modules (ideally same vendor) and if the RAM is interleaved then the banks or channels need to support the same RAM, otherwise a Bank or Channel which is not interleaved can support different RAM sizes. In some systems the given channel must hold the same RAM, but a different channel can support a different RAM sizes. Give this a read [https://support.apple.com/en-us/101639|Install and replace memory in your Mac Pro (2019)] talk about confusing!