The 3/4 is rated at 6 amps 115. The 1hp is 6.8 amps. I really think its more marketing than grunt, no way is another 1/4hp is only taking 0.8 amps. I looked for a date code, not there. I'm not unhappy with the purchase, just realize what I bought. Its probably close to a true 1/3-1/2hp 8"...