Hi @captainseko,
it sounds to me like you've the same mindset as me and as we're both near to the age of 50 we had a long experience with all the memory stuff from SD-RAM, DDR, DDR-2, DDR-3 DDR-4 and now DDR-5. As you know DDR is meaning double data rate, so when it came up to the discussion about "performance" we've to take a look at the whole RAM module. Beginning from the real clock which is half of the MT/s which means 5600MT/s is 2800MHz, 5200MT/s is 2600MHz or 4800MT/s is 2400MHz.
The second thing about RAM performance is still the CAS latency ( CL ) which describes the time the RAM can be filled with new informations. In fact: the lower the latency the faster the RAM. This is in comparsion to the higher frequencies. The higher the frequency the faster the RAM. But within electrical issues and / or limitations it isn't possible to get higher frequencies AND lower latency. So when your freqency rises up ( from 4800MT/s to 5600MT/s ) the lantency will rise up, too ( maybe from CL 36 to CL40 ). This will end up in a nearly close performance state and will work the other way, too. Lower latency is only possible with lower frequencies.
So as we know that it just depends on the the silicon lottery and the programming of the RAM manufaturer to max out both factors.
As we know the 3rd factor came out if we're talking about bigger sized modules ( 32GB+ ) which are double ranked and therefore only supporting lower frequencies ( only 5200MT/s instead of 5600MT/s for single sided modules ) but in the same way the latency came down a bit. For example we take a look at the 64GB Kingston Fury kit which is discribed as 5600MT/s kit with CL40 from manufacturer site. But while Intel is only supporting 5200MT/s on double ranked modules our system is recognizing and supporting this kit only with 5200MT/s but with a slightly lower latency of CL38.
So there are many more factors which have to keep in mind and to take a look at when you still want to squeeze out the last performance drop out of your system. For that you can simply take a look at a simple programmed calculator you can find HERE to compare the expected performance increase or boost to your system. What's not included are the pro and cons of the different RAM sizes you prefer depending on your software, workload and needs or favorisation. These are naked numbers and facts for the RAM speed.
So maybe this could explain the past experience of @DreamBim when he ( or she ) upgraded the RAM from 16GB to 32GB within the same speed of 4800MT/s modules ( but I think the new modules had slightly lower latencies ? ) or you get an extra boost from the amount of memory. So only talking about the "speed" of the RAM isn't the real solution for maxing out a system. It's like comparing the max speed of a car against the force or power a motor bringing up over the transmission to the wheels on the streets. Therefore we've also different numbers on cars like force ( Newtonmeters NM ), horsepower ( HP ) or max speed ( max. mp/h or max. km/h ).
Hopefully I could clear some things up.
