ram compatibility question

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Star Butterfly

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May 15, 2017
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I have a Avexir Core Series 4GB 2400MHz PC4-19200 DDR4 1.2V LED DIMM for Desktop (Red) im planning on buying a Avexir Core Series 8GB 2400MHz PC4-19200 DDR4 1.2V LED DIMM for Desktop (Red) so will the 4gb and 8gb work? Like when I run my computer will it become 12gb ram?
 
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Maybe. If the modules work together. They may or may not. That's why RAM is sold in "kits" that are guaranteed to work together.

If they do work together you will have 12Gb of RAM but you will lose the dual channel capability because the modules are different sizes so, in effect, it will be running at half speed, i.e. single channel.
http://www.hardwaresecrets.com/memory-upgrade/

If you buy another 4Gb module you'll have 8Gb RAM but they won't be guaranteed to work together so you may or may not lose the dual channel capability.
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thx1138v2

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Maybe. If the modules work together. They may or may not. That's why RAM is sold in "kits" that are guaranteed to work together.

If they do work together you will have 12Gb of RAM but you will lose the dual channel capability because the modules are different sizes so, in effect, it will be running at half speed, i.e. single channel.
http://www.hardwaresecrets.com/memory-upgrade/

If you buy another 4Gb module you'll have 8Gb RAM but they won't be guaranteed to work together so you may or may not lose the dual channel capability.
 
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Rexper

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Apr 12, 2017
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Since they have the same timings, frequency, and voltage you have higher chances of them working together but there's still a chance of incompatibility.

You will have 12gb of ram, but only 8gb (4gb from each ram module) will work in dual channel mode. The remaining 4gb will work as a seperate single channel.

Dual channel is not double the speed of single channel.

Edit: forgot to ask what motherboard you're using. It's impossible to say the compatibility without the knowledge of your motherboard.
 
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thx1138v2

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Each module has a 64-bit data path. In dual channel mode the two 64-bit data paths appear to work as one 128-bit data path. So each read or write happens 128 bits at a time. In single channel mode only 64 bits can be read/written at a time.

Technically speaking, the speed doesn't change. But the effective speed does change because twice as much data is being processed in the same amount of time. That's why I said "...so, in effect, it will be running at half speed"

BTW, "Avexir Core Series 8GB 288-Pin DDR4 SDRAM DDR4 2400" is NOT 2400MHz. You won't see them put the "MHz" behind the 2400. Its clock speed will be 1200MHz but they advertise it as "2400" because, being DDR (double data rate), it will handle reads or writes on both the rising edge and the falling edge of the clock cycle. That's purely a marketing ploy. Check it out in the Memory tab of CPU-Z and you'll see the actual speed.

http://www.hardwaresecrets.com/everything-you-need-to-know-about-the-dual-triple-and-quad-channel-memory-architectures/2/

With 64 bits per channel, i.e. physical socket, there is no way to run part of the memory on a module as dual channel and part as single channel. Either the two sockets run in dual channel mode or they don't. In the case of mixed memory, they won't run in dual channel mode.

http://www.hardwaresecrets.com/memory-upgrade/
 
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