Question Can I mix ram memory sticks with different capacity but same Cas Latency (CL) and at the same frequency?

Sep 9, 2020
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Hi guys,

Currently I am using 2 sticks of Kingston HyperX Fury Red 8gb DDR4 2400mhz (16 in total) on MSI B350 Gaming Plus motherboard. (attaching photos below of my current build).
I'd like to upgrade my ram memory but instead of selling the current one and go for new ones, I was wondering if I'd be able to purchase 2 extra sticks of 16gbs / per stick (+32gbs in total) from this model:
Kingston HyperX FURY Black 16GB 2400MHz DDR4 CL15 DIMM - https://www.kingston.com/datasheets/hx424c15fb_16.pdf

So, having new these 2 of 16gb's and my current ones of 8gb's would make 48gbs in total but I am not sure if I'd have any troubles with the new ones or should I go for 2 new sticks of 8gb's / per stick: https://www.kingston.com/datasheets/HX424C15FR2_8.pdf

photo of my current ram:


my pc build:


Thanks in advance guys!
 
Hi guys,

Currently I am using 2 sticks of Kingston HyperX Fury Red 8gb DDR4 2400mhz (16 in total) on MSI B350 Gaming Plus motherboard. (attaching photos below of my current build).
I'd like to upgrade my ram memory but instead of selling the current one and go for new ones, I was wondering if I'd be able to purchase 2 extra sticks of 16gbs / per stick (+32gbs in total) from this model:
Kingston HyperX FURY Black 16GB 2400MHz DDR4 CL15 DIMM - https://www.kingston.com/datasheets/hx424c15fb_16.pdf

So, having new these 2 of 16gb's and my current ones of 8gb's would make 48gbs in total but I am not sure if I'd have any troubles with the new ones or should I go for 2 new sticks of 8gb's / per stick: https://www.kingston.com/datasheets/HX424C15FR2_8.pdf

photo of my current ram:


my pc build:


Thanks in advance guys!
This shouldn't be a problem (having 2 x 8 + 2 x 16) provided the frequency and CL is the same. You are only running at DDR4 base speed anyway, which should be fine. Ryzen can be fussy with higher memory speeds (i.e. 3000 mhz and above) but 2400 should be fine.
 
Sep 9, 2020
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Thanks for replying cdrkf,

I just contact a local seller, they are having the 16gb sticks out of stock as well as the 8gbs on 2400mhz as well.
He suggested that I'd be able to purchase 2 new ones on 8gbs and at 2666Mhz, he said they'll work on the lower frequency at 2400MHz but it will work with no problem. Having 2 sticks (8gbs / per stick) at 2400MHz and 2 (8gbs / per stick) at 2666MHz. Would that be possible?
 
Thanks for replying cdrkf,

I just contact a local seller, they are having the 16gb sticks out of stock as well as the 8gbs on 2400mhz as well.
He suggested that I'd be able to purchase 2 new ones on 8gbs and at 2666Mhz, he said they'll work on the lower frequency at 2400MHz but it will work with no problem. Having 2 sticks (8gbs / per stick) at 2400MHz and 2 (8gbs / per stick) at 2666MHz. Would that be possible?
Yeah there is no problem running faster ram at lower speeds, the official base specification for DDR4 memory is 2133 or 2400mhz - all modules should run at that frequency. The speed rating on ram is more of an 'up to' - when mixing kits all the memory has to run at the speed of the slowest modules.
 
Reactions: MadjM
Oct 28, 2020
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This shouldn't be a problem (having 2 x 8 + 2 x 16) provided the frequency and CL is the same. You are only running at DDR4 base speed anyway, which should be fine. Ryzen can be fussy with higher memory speeds (i.e. 3000 mhz and above) but 2400 should be fine.
Even with all that said, you can still run into compatibility issues because of the difference size ram and the version of the ram itself which is also import. Try to match that as well. Version 1.0 with a Version 1.0. Mixing versions can be hit or miss.
 
Reactions: MadjM
Sep 9, 2020
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Thanks a lot guys. Luckly the official local shop found 2 brand new sticks on 8gbs - same ones that I have on my PC and gave me a top notch price of nearly 70euros for the both or smth. Wasn't sure I wanted to wait for a month or so till they have new ones in the shop or proceed with the 2666MHz. Thanks and have a great night!
 

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