Last month, Xbox 360 sold about 205,000 in the U.S.
The data does not include sales after August 30, so the September 5 across-the-board Xbox 360 price cut was not taken into consideration this time around. Next month's NPDs will serve as a better barometer of the price cut's affect on sales.
Microsoft did say, citing internal data, that sales for the $199 Xbox 360 Arcade sold six time more than the weekend before following the console's $50 price cut.
Citing NPD data, Microsoft also claimed a software attach rate of eight games per console.
The firm added that Xbox 360 generated third party revenues of $94 million during August, or $4.1 billion to date.