How much maximum Ram I can have per slot for desktops and laptops?
Which parameters defines that?
Update
if the motherboard with 4 slots support 64GB of Ram, is that true that i can have maximum of 16GB Ram per slot?
How much maximum Ram I can have per slot for desktops and laptops?
Which parameters defines that?
Update
if the motherboard with 4 slots support 64GB of Ram, is that true that i can have maximum of 16GB Ram per slot?
These would depend on your motherboard.
On Unices, commands such as dmidecode would help you identify what hardware you're working with. Without knowing such, we can't tell.
Not being familiar with Windows, I can point you to: How can I find out what motherboard is in my computer?
As of Z170-A, you would find the exact specs on Asus website (https://www.asus.com/Motherboards/Z170-A/specifications/). As suggested already in the comments, it is limited to 64GB of DDR4.