Three months on from the arrival of the XPS 13 ultrabook, Dell has added two new models to the range, in a bid to appeal to customers looking for a little more oomph.

The main point of difference is the larger screens on the new models, with buyers now able to choose from the 14-inch XPS 14 and the 15.6-inch XPS 15 if the XPS 13's 13.3-inch display is a little too small.

Dell is offering a few other features to sway users, with the XPS 14 offering an estimated 11 hours of battery life compared to the XPS 13's 8 hours and 53 minutes, and the XPS 15 offering NVIDIA graphics as standard and a slot-load Blu-ray disc drive as an optional extra.

As the release from Dell describes the range, "The XPS 13 is highly portable and compact for today's mobile users, while the XPS 14 provides extended battery life and connectivity for those who need to go all day wherever they are, and the XPS 15 provides performance graphics and a brilliant display for multimedia creation and entertainment.

"All three laptops have enterprise-friendly features to intersect the design and performance desired by consumers with the security and services required by IT departments.

The XPS 14 starts at $1799 (the same price as the XPS 13) while the XPS 15 is priced from $2199. Click here to compare the models.