DDR5 requires a new motherboard and CPU.

No.

DDR5 uses a different physical slot shape and voltage than DDR4. They are not interchangeable. Even if you somehow forced it in (which you shouldn’t), the memory controller on older CPUs and chipsets doesn’t know how to talk to DDR5.

You need a motherboard with a DDR5-compatible chipset (Intel 600 series or later, AMD AM5), and a CPU that supports that chipset. That means you’re looking at a new CPU and motherboard, not just a RAM swap.

Don’t try to force it.