So I bought a very cheap used 4GB DDR4-3200 stick for the mainboard as router/server/etc project. Then someone just gave me an 8GB DDR4-2666 module.
Can I mix the two sizes in slot 0 and slot 1? I assume it will run the 4GB at 2666 instead to match the 8GB? Or are the different speeds in the different slots going to be a no go?
There are several posts on RAM here on the community and it looks like mixing is possible with some sticks but performance will likely be affected and some combinations may cause the system to fail to boot. Search for RAM and take a look at some of the conversations.