FYI Dell has a 20-25% off outlet sale going on all home laptops so I snapped up the following for my gf with the 640M + blu ray. There's also a $50 off coupon floating around that stacks with it so you can save even a little more. I realized this after I had already purchased it so it's a bit too late XPS 15 Known Issues Newest bios causes GPU throttling in favor of CPU speed. Old bios does the opposite. Wireless signal is weak with these systems. Hoping @svl7 and @Prema will be able to help with some bios modding to get rid of the throttling. Service Manual ftp://ftp.dell.com/Manuals/all-products/esuprt_laptop/esuprt_xps_laptop/xps-15-l521x_Owner%27s%20Manual_en-us.pdf Videos http://youtu.be/eaorXn27D_U