Oh ya, The E1705 is a great laptop and has huge Overclocking potential!
you can nearly double the GPU speed (325MHZ - 640MHZ)with a 7900GS Go and even take the stock 1000MHZ memory clock to 1600MHZ
the CPU has a large amount of head room for overclocking but because of the PLL IC's used by dell it is close to impossible to overclock the CPU short of a Pin Mod...