ddr2 in ddr3 slot: Ram DDR, DDR2, DDR3, DDR4, DDR5... khác nhau thế nào?. Embedded systems that use double data rate memory (DDR). How to Compare and Upgrade RAM in Your PC - LinkedIn.
Are not backwards compatible—DDR3 modules do not fit into DDR2 sockets; forcing them can damage the DIMM and/or the motherboard [37].
The AM3+ socket has a different pinout designe, ensure that you use a CPU designed for the AM3+/AM3 socket. ... DO NOT install a DDR or DDR2 memory module to the DDR3
slot.
Most modern DDR, DDR2, DDR3, and DDR4 RAM modules are compatible with dual channel technology. However, it is important to note that the RAM modules must be the same type, size, and speed to work together in this mode.