A memory device is provided. The memory device includes a plurality of memory array banks, a bus, a data buffer, and four data paths. The data buffer provides data from the memory array banks to an external node. The first data path includes a first compression module for compressing the data from the memory array banks to the bus. The second data path transmits the data from the memory array banks to the bus. The third data path includes a second compression module for compressing data from the bus to the data buffer. The fourth data path transmits the data from the bus to the data buffer.