Is DDR4 RAM compatible in a DDR3 RAM slot?

Socket LGA 775; Supported Intel Core 2 QuadCore 2 DuoPentium Dual-Core Supported 2 DIMM of DDR3 13331066800MHz; Supports BIO-Remote 2 Technology

ddr3 memory Ive heard ddr3 dosent work on ddr4 No, you can't use DDR3 on a board that has DDR4 memory slots only

ddr3 in ddr4 slot slot What is the most likely scenario? A The technician is trying to install DDR4 into a motherboard with DDR3 slots B The technician is trying to install

ddr3 slot ddr3 memory Ive heard ddr3 dosent work on ddr4 No, you can't use DDR3 on a board that has DDR4 memory slots only