Question Mixing same brand and model but 2 different CL RAM's, do they work in dual channel?

DeathByKid

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The RAM I'm using right now first
The RAM I need to buy second

The first RAM is no more being manufactured by Kingston and no more sold in my country. As far as I can see, Kingston remastered it and now manufacturing the second one.

These two has different CL timings, first one is CL18 and seconds one is CL16. Also, first one is 1.2V and second one is 1.35V.
Can I use them in dual channel? Is there any BIOS setup I can do to use both in dual channel?
 
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If they work together, you will have dual channel operation.
The problem is that they may not work together.

Ram is sold in kits for a reason.
A motherboard must manage all the ram using the same specs of voltage, cas and speed.
The internal workings are designed for the capacity of the kit.
Ram from the same vendor and part number can be made up of differing manufacturing components over time.
Some motherboards, can be very sensitive to this.
This is more difficult when more sticks are involved.

If you do buy more disparate sticks, they should be the same speed, voltage and cas numbers.
Even then your chances of working are less than 100%
I might guess 90% success for intel and less for amd.

What is your plan "B" if the new stick/s do not work?

If you want 16gb, my suggestion is to buy a 2 x 8gb kit that matches your current specs.
Then, try adding in your old 8gb,
If it works, good; you now have extra ram.
If not, sell the old ram or keep it as a spare.
 
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DeathByKid

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RAM is only guaranteed to work together when bought as a kit. Two identical sticks might not work without issues let alone two differently specced sticks.
If they work together, you will have dual channel operation.
The problem is that they may not work together.

Ram is sold in kits for a reason.
A motherboard must manage all the ram using the same specs of voltage, cas and speed.
The internal workings are designed for the capacity of the kit.
Ram from the same vendor and part number can be made up of differing manufacturing components over time.
Some motherboards, can be very sensitive to this.
This is more difficult when more sticks are involved.

If you do buy more disparate sticks, they should be the same speed, voltage and cas numbers.
Even then your chances of working are less than 100%
I might guess 90% success for intel and less for amd.

What is your plan "B" if the new stick/s do not work?

If you want 16gb, my suggestion is to buy a 2 x 8gb kit that matches your current specs.
Then, try adding in your old 8gb,
If it works, good; you now have extra ram.
If not, sell the old ram or keep it as a spare.
So I've just tried to start the PC with changing timings of my CL18 RAM. I've set it to 3000MHz and 1.35V and same timings 15-17-17 and PC is working fine right now. Those settings are the same timing settings as the second ram I want to buy.
I've used data from this page.
Would they work together now? First one is able to match second one without any issues.

Also buying 2x8 kit and having a spare one is a good idea.
 

DeathByKid

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No issues... who knows?
Even the same part number and manufacturing lot may not work together.
If your motherboard has 4 slots, you might try to add in the old 8gb and get 24gb.
I'm currently using a B450M-S2H with Ryzen 5 2600. It only has 2 slots.
 

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