Bethesda Softworks said Thursday that the critical hit Fallout 3 has shipped 4.7 million copies worldwide across PC, Xbox 360 and PS3, generating sales of over $300 million.

The shipments were made in about a week's worth of time. A rep told Edge specific platform sales were not available at the current time.

By comparison, it took Bethesda's last epic RPG, The Elder Scrolls IV: Oblivion, about three weeks to ship just 1.7 million copies when it launched in March 2006 on only two platforms, Xbox 360 and PC (it later came to PS3).

A considerably larger console install base, focused marketing and plenty of hype amongst gamers and media helped push the game past Oblivion.

Fallout 3 landed in North American stores on October 28 and a couple days later in PAL territories.

The post-apocalyptic RPG is set in Washington D.C., now reduced to a wasteland following a nuclear war that drove humans into underground vaults.