I tried to install a ddr3 into a ddr4 slot and tried to boot it

No They don't even fit in the same slots There were a very few motherboards that had DDR4 and DDR3 slots, but you could only use one

DDR4 DDR5 Operates at a lower voltage and faster speeds than DDR3 slot Tech Tip Using a lower-voltage chip DDR3 and DDR4 memory can be purchased

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