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All Cray machines (except the CS6400 range) had 64 bit words. Each word could hold 1 integer, 1 floating point numeric value or 8 characters. All arithmetic and logical operations were done in 64 bit maths. Memory sizes were generally designated in Mega Words. 32 MWd can be thought of as 256 Megabytes. However really the memory was 72 or 80 bits wide at the hardware level See SECDED.
