Question Will mixing RAM be an issue ?

[-xDesertEaglex-]

I have been looking for the right match for my build, I have GSkill 32 GB 6400 with 32-39-39-76 Cas, I wonder if will there be any issues if I couple it with another GSkills 32 GB with 32-39-39-102?

One is found here:

Memory Model F5-6400J3239G16GX2-TZ5RK​

https://www.newegg.com/g-skill-trident-z5-rgb-series-32gb-ddr5-6400-cas-latency-cl32-desktop-memory-black/p/N82E16820374358?Item=N82E16820374358&_gl=1*fm8g4c*_gcl_au*MjAzOTUzNTU2OC4xNzUwODc3NTQy*_ga*MTU3NDEwMjM3Mi4xNzUwODc3NTQy*_ga_TR46GG8HLR*czE3NTEzMzEwMDQkbzMkZzEkdDE3NTEzMzEwNDQkajIwJGwwJGgxMjU5Mjg1OQ..

Other one is found here:

Memory Model F5-6400J3239G16GA2-TZ5RK​

https://www.amazon.com/dp/B09QS2K59B?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

They're both almost identical on every aspect except for the CAS

 

[COLGeek]

Mixing memory can lead to all sorts of issues. Installing 100% matched memory is the way to go for best results.

You would be better served with 2x32GB from a matched set.

 

[-xDesertEaglex-]

Mixing memory can lead to all sorts of issues. Installing 100% matched memory is the way to go for best results.

You would be better served with 2x32GB from a matched set.

So even when their differences are very minor or minuscule, are there still chances of any conflict?

 

[punkncat]

When this initially boots the system will try to find a compatible timing to the fastest set to match the slower set. It may or may not be able to boot. You might have to use one of various programs to see timings such as a simple one in CPU-Z and try to match the settings to your slowest set. Sometimes there will be a 'cross reference' of sorts in the JEDEC timings displayed. As memory issues go what can sometimes happen is you end up with a very slow degradation to system stability, files, and so on which can easily be mistaken for other hardware problems.

Another aspect is that two sticks of memory are typically more stable than four sticks due to various factors and often tied in with VRM/power delivery of the motherboard.

In my own common experience, I have found Intel to me a bit more tolerant of mixed RAM and in particular on older chipsets. Ryzen has been the opposite and is often finicky. YMMV.

 

[CountMike]

So even when their differences are very minor or minuscule, are there still chances of any conflict?

That can happen even when there are no differences at all but when sticks are not properly matched and tested together as they may not be binned same. Memory controller is in the CPU but all regulated thru BIOS which may or may not accept changes. That's why there are RAMs sold as a kit and QVL lists for MBs, actually for their BIOS which is most of times updated for better compatibility.