While we'll have to wait for the NPD data to find out how Bethesda Softworks' Fallout 3 has performed in the U.S., across the pond in the U.K. Chart-Track has already reported major success for the action RPG.

In its first week on sale in the U.K., Fallout 3 has immediately grabbed the top spot on the all-format chart in addition to the charts for Xbox 360, PS3 and PC. 55 percent of Fallout 3 purchasers picked up the Xbox 360 version, followed by 28 percent for PS3 and 17 percent for PC.

Although Chart-Track has not provided unit sales figures, the market researchers noted that Fallout 3 has already outsold every previous Fallout game combined. Furthermore, Fallout 3 has been outselling Bethesda's critically acclaimed RPG Elder Scrolls IV: Oblivion by 57 percent.

Fallout 3's debut displaced Lionhead's Fable II, which fell to fourth place overall as its sales dropped 51 percent.

Interestingly, Wii Fit saw a huge lift this past week as well, as sales jumped 126 percent, leading to the title's third best week ever. The game rose from number eight to number three and became the week's top selling title across a single format in terms of both units and revenue.

Fallout 3 gallery

    Vault-Tec engineers have worked around the clock on an interactive reproduction of Wasteland life for you to enjoy from the comfort of your own vault. Included in Fallout 3 is an expansive world, unique combat, shockingly realistic visuals, tons of player choice, and an incredible cast of dynamic characters. Every minute is a fight for survival against the terrors of the outside world-radiation, super mutants, and hostile mutated creatures. (Screenshot 1 of 59)

    Vault-Tec engineers have worked around the clock on an interactive reproduction of Wasteland life for you to enjoy from the comfort of your own vault. Included in Fallout 3 is an expansive world, unique combat, shockingly realistic visuals, tons of player choice, and an incredible cast of dynamic characters. Every minute is a fight for survival against the terrors of the outside world-radiation, super mutants, and hostile mutated creatures. (Screenshot 2 of 59)

    Vault-Tec engineers have worked around the clock on an interactive reproduction of Wasteland life for you to enjoy from the comfort of your own vault. Included in Fallout 3 is an expansive world, unique combat, shockingly realistic visuals, tons of player choice, and an incredible cast of dynamic characters. Every minute is a fight for survival against the terrors of the outside world-radiation, super mutants, and hostile mutated creatures. (Screenshot 3 of 59)

    Vault-Tec engineers have worked around the clock on an interactive reproduction of Wasteland life for you to enjoy from the comfort of your own vault. Included in Fallout 3 is an expansive world, unique combat, shockingly realistic visuals, tons of player choice, and an incredible cast of dynamic characters. Every minute is a fight for survival against the terrors of the outside world-radiation, super mutants, and hostile mutated creatures. (Screenshot 4 of 59)

    Vault-Tec engineers have worked around the clock on an interactive reproduction of Wasteland life for you to enjoy from the comfort of your own vault. Included in Fallout 3 is an expansive world, unique combat, shockingly realistic visuals, tons of player choice, and an incredible cast of dynamic characters. Every minute is a fight for survival against the terrors of the outside world-radiation, super mutants, and hostile mutated creatures. (Screenshot 5 of 59)

    Vault-Tec engineers have worked around the clock on an interactive reproduction of Wasteland life for you to enjoy from the comfort of your own vault. Included in Fallout 3 is an expansive world, unique combat, shockingly realistic visuals, tons of player choice, and an incredible cast of dynamic characters. Every minute is a fight for survival against the terrors of the outside world-radiation, super mutants, and hostile mutated creatures. (Screenshot 6 of 59)

    Vault-Tec engineers have worked around the clock on an interactive reproduction of Wasteland life for you to enjoy from the comfort of your own vault. Included in Fallout 3 is an expansive world, unique combat, shockingly realistic visuals, tons of player choice, and an incredible cast of dynamic characters. Every minute is a fight for survival against the terrors of the outside world-radiation, super mutants, and hostile mutated creatures. (Screenshot 7 of 59)

    Vault-Tec engineers have worked around the clock on an interactive reproduction of Wasteland life for you to enjoy from the comfort of your own vault. Included in Fallout 3 is an expansive world, unique combat, shockingly realistic visuals, tons of player choice, and an incredible cast of dynamic characters. Every minute is a fight for survival against the terrors of the outside world-radiation, super mutants, and hostile mutated creatures. (Screenshot 8 of 59)

    Vault-Tec engineers have worked around the clock on an interactive reproduction of Wasteland life for you to enjoy from the comfort of your own vault. Included in Fallout 3 is an expansive world, unique combat, shockingly realistic visuals, tons of player choice, and an incredible cast of dynamic characters. Every minute is a fight for survival against the terrors of the outside world-radiation, super mutants, and hostile mutated creatures. (Screenshot 9 of 59)

    Vault-Tec engineers have worked around the clock on an interactive reproduction of Wasteland life for you to enjoy from the comfort of your own vault. Included in Fallout 3 is an expansive world, unique combat, shockingly realistic visuals, tons of player choice, and an incredible cast of dynamic characters. Every minute is a fight for survival against the terrors of the outside world-radiation, super mutants, and hostile mutated creatures. (Screenshot 10 of 59)