Recently, optically reconfigurable gate arrays (ORGAs) that enable high information processing speed are being developed. Such optically reconfigurable gate arrays consist of a laser diode array, a holographic memory, and a gate array VLSI, allowing fast reconfigurations and numerous reconfiguration contexts. Since an ORGA-VLSI can be programmed optically and in perfectly parallel, even if its gate array includes defect portions, the gate array can be used by avoiding such defect portions and by programming the same circuit to the other area. However, it is required that a holographic memory to support such programming must be dependable. So, this paper clarifies noise tolerance properties of holographic configurations.