В идеале брать то на что хватает денег, хуже не будет, а парится с подгонкой под другие элементы давно ушло в прошлое
Memory Clock Speeds (Clock Cycles)
You might’ve come across various MHz specifications when buying RAM. The number given with this unit is simply the maximum cycles per second it can handle. So, a memory rated at 3600 MHz is capable of performing 3.6 billion cycles per second.
Then does a higher clock indicate faster RAM? Well, yes and no.
There are many factors at play when it comes to memory speeds in real-world usage. They’re often limited by latency, processor architecture, and other things. However, as a simple rule of thumb, faster memory clocks will usually be faster than RAM with lower memory clocks