As a general rule, laptops do not have the updating ability of desktops. A different graphics chip would probably necessitate a new mother board, power supply, not to mention the heat increase. Look for a new laptop...and, try to "build your own" from companies like Sager/Clevo rather than buying a mass produced "model number" from any of the major suppliers. Keep in mind that Sony, Toshiba, and Panasonic laptops cannot use 'generic' drivers and must always use the vendor OEM updates...which are limited. If you read enough, you will also find that 'switchable' graphics have the same problem...limited support from the manufacturer.
Intel I7 960 @ 3.87ghz *Intel DX58SO *AMD R9 290 4gb *Corsair TX650M *2x4gb Corsair XMS3 *WD Black 1TB *Windows 7 Home Premium 64bit ***Asus N71Jq laptop *Intel I7 720QM Processor *Mobility Radeon HD5730 1gb *8gb Ram *Windows 7 64bit ** Toshiba P75-A7200 * Intel I7-4700MQ * Windows 8.1 64bit
***** cetera fallunt, ludere mortuus ******