An approach is provided for implementing near-memory data reduction during store operations to off-chip or off-die memory. A Near-Memory Reduction (NMR) unit provides near-memory data reduction during write operations to a specified address range. The NMR unit is configured with a range of addresses to be reduced and when a store operation specifies an address within the range of addresses, the NRM unit performs data reduction by adding the data value specified by the store operation to an accumulated reduction result. According to an embodiment, the NRM unit maintains a count of the number of updates to the accumulated reduction result that are used to determine when data reduction has been completed.