According to a presentation by Cammie Dunaway of Nintendo.
First 18 months software units (US):
Wii - 50 million (not including Wii Sports)
X360 - 28 million
PS3 - 20 million
PS2 - 42 million
First 18 months hardware units (US):
Wii - 9.5 million
X360 - 5.2 million
PS3 - 4.2 million
PS2 - 8.5 million
http://kotaku.com/5010214/nintendo-wii-has-highest-software-sales-for-first-18-months
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Bei den oberen Zahlen geht es um US Zahlen (NPD). Es werden die Software- und Hardwarezahlen der ersten 18 Monate jeder Konsole angegeben. Beim Wii ist WiiSports nicht miteinbezogen worden.