I'm aware this thread is a bit dated but I had to interject my two cents based on what I know of the N**SF line by ASUS. I have an N75SF, and Not only is the GPU not soldered onto the board, it's in a mini pcie 2 slot and changing it couldn't be easier, on the N75SF, I mean. I'm of the opinion that the 55' is proibably similar. As far as "high end" goes, the N75 sold for around $2,500 USD when it debuted, just a pinch cheaper than the 14" Alienware, for the 18" Asus. I've gone so far as to build a quickly detachable watercooled dock area, and frequently overclock mine to around 15% boost of the base 675/900/1350 clocks with stable results, never cresting above 65 C. I've discussed this in detail with some other Forum-goers on another thread. If I anyone has vbios for this config of 555m with a voltage break please pm me. It's 555m 10DE 1247 - 1043 2051 for reference and is the exact same chip and config as the 635m from my understanding. I'll run this gpu until I brick it, or I find a good price on a 560m to fill the slot. Nearly 5 years of running it far beyond it's "capabilities" and not a dent in it. People only say "can't" about things they lack the imagination to make reality.