If bluetooth is not included, you’re getting Centrino Ultimate-N 6300 or Dell wireless 1506 g/n 1×1, which apparently uses the Atheros AR5B125 chipset (that’s news to me-I’d thought the Dell-branded wireless was all Broadcom, which any Linux/BSD user knows to hate). No one seems impressed by the 1600×900 display at all in reviews. Someone with i7 says too much fan noise, someone with i5 says they have no problem and maybe it’s the i7. Chassis “tri-metal”, whatever that means. 6-cell, 9-cell, review was not impressed by power consumption/battery life, and that the display was weak for what you were paying new (€1000). Dell states clearly that 4th generation Intel processors only support 1.35V, so no putting in plain old DDR3. I think there were quad options eventually, but maybe those were just upgrades people made. First, specs and such, from reading reviews and documents: Introduced autumn 2013? i5 or i7.