CMOS was initially slower than NMOS logic, thus NMOS was more widely used for computers in the 1970s.[10] The Intel 5101 (1 kb SRAM) CMOS memory chip (1974) had an access time of 800 ns,[11][12] whereas the fastest NMOS chip at the time, the Intel 2147 (4 kb SRAM) HMOS memory chip (1976), had an access time of 55/70 ns.[10][12] In 1978, a Hitachi research team led by Toshiaki Masuhara introduced the twin-well Hi-CMOS process, with its HM6147 (4 kb SRAM) memory chip, manufactured with a 3 µm process.[10][13] The Hitachi HM6147 chip was able to match the performance (55/70 ns access) of the Intel 2147 HMOS chip, while the HM6147 also consumed significantly less power (15 mA) than the 2147 (110 mA).