Hi, I've been wanting to upgrade my GeForce GTX 260m graphics card with something better, but I can't seem to find anything that will be compatible with my laptop.
Processor:i5 @ 2.53GHz (4CPUs)~2.5GHZ
DirectX version 11
I'm not sure about the power, my AC Adapter draws 150W
Video cards for laptops are typically sold only to OEMs like Dell / Alienware / Falcon Northwest, etc and they would install the card in the laptop's MXM slot. If it has a MXM slot. Most laptops have the video chip soldered onto the motherboard. These laptops cannot be upgraded.
If your Alienware m15x does use a MXM format video card (type I, II, III), then it is possible to upgrade. However, finding a place to buy a MXM card is the difficult part.