SPD I2c Address for DDR4 SODIMM
0x50 in 7-bit notation which does not include the read/write bit equals 0xA0 and 0xA1 in 8-bit notation which does equal the read/write bit.
As each slot must have one address, and there are 3 address bits AD[2:0], you can set the address of a slot between 0x50 to 0x57.