Can I use DDR3 RAM in DDR4 slot?

I'm making an estimate to fit a new PC this time.

I'm using DDR4 on the main board, can I insert DDR3 RAM in the DDR4 slot?

I have a DDR3 RAM that I am using now, and I was wondering if I could use it as it is

1287 2018-11-05 Gentleman

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