Nvidia GT 240m

Nvidia GT240m
Dell part N°: KCTKH

Official Drivers here:
Alternative Drivers here:

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Nvidia GTX 260m

Nvidia GTX260m
Dell part N°: 96RJ4

Official Drivers here:
Alternative Drivers here:

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Nvidia GTX 460m

Nvidia GTX460m N11E-GS
Dell part N°: VDV04

Official Drivers here:
Alternative Drivers here:

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Nvidia GTX 470m (Inofficially)*

Nvidia GTX470m N12E-GS
Dell part N°: YT99J

Official Drivers here:
Alternative Drivers here:

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AMD HD 5730m XT

AMD HD5730m XT
Dell part N°: NTVGT

Modded 11.7b Drivers:
Preview 11.8 Drivers:

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AMD 5850m Pro

AMD 5850m Pro 
Dell part N°: 0XYPF

Modded 11.7b Drivers:
Preview 11.8 Drivers:

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AMD 5850m Broadway Pro

AMD 5850m Broadway Pro
Dell part N°: K6654

Modded 11.7b Drivers:
Preview 11.8 Drivers:

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AMD HD 5870m XT (Inofficially)*

AMD HD5870m XT
Dell part N°: C8245

Modded 11.7b Drivers:
Preview 11.8 Drivers:

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AMD HD 6970m (Inofficially)*

AMD HD6970m Blackcomb XT Left
Dell part N°: V9XKH

Modded 11.7b Drivers:
Preview 11.8 Drivers:

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M15x R2 Available GPUs

The M15x is Alienware most updateable machine ever, it's proven that it even supports the latest 6990 (but not with al xtreme processors due to power limits).
*Guide for all unofficial cards upgrade comming soon