updated GeForce GT 750M, no optical drive, and a relatively high-resolution 3200×1800 display. The XPS 15 shipped with Windows 8.1. Worth mention is that there are three different models of the new XPS 15 available right now. The base model XPS 15 comes with a 1920×1080 touchscreen display (it is unclear if this is a TN panel or not), 500 GB HDD with 32 GiB msata SSD cache, dual-core i5-4200H CPU, 8 GiB RAM, integrated HD 4400 Graphics, and a 61Wh battery. A mid-range model has a quad-core i7-4702HQ CPU, 3200×1800 PPS (similar to IPS) touchscreen, 16 GiB RAM, GT 750M GDDR5 GPU, a 1 TB HDD with 32 GiB SSD cache, and a 61 Wh battery. The high-end edition is mostly the same as the mid-range model but replaces the HDD with a 512 GB mSATA SSD and adds a larger 91 Wh battery in place of the 2.5" drive. There is also higher resolution 4k 3840x2160, slightly better CPU - i7-4712HQ. The 9530 has been criticized for the instability of 802.11ac Wi-Fi. Currently this model has an issue with respect to an annoying electrical/hissing noise called 'Coil Whine'. XPS 15 (9550, October 2015) On October 8, 2015, Dell refreshed the XPS 15 (9550) with the Skylake microarchitecture. A 15.6-inch UltraSharp™ InfinityEdge display is included to fit into the body of a relatively small notebook that responds well to standard Windows 8.1 swipes and commands. Edge-to-edge Gorilla Glass NBT covers the screen. The chiclet-keys of backlight keyboard are matte black and feature a slightly concave surface area. This redesigned model offers PCIe SSDs up to 1 TB, up to 32 GiB of DDR4 RAM through two SODIMM slots, GeForce GTX 960M with 2 GiB GDDR5, a 3×3 802.11ac Wi-Fi card, and featuring Thunderbolt 3 through Type-C, though this port is only able to achieve Thunderbolt 2 speeds. XPS 15 (9560, Early 2017) A slightly updated model 9560 was released in February 2017. The new model aligned with the previous model 9550 in terms of dimension and exterior ports, but inside the CPU and GPU were upgraded to Kaby Lake and GTX 1050, respectively. This model suffered from many thermal issues at high work loads, causing the computer to not be able to use all of its power. XPS 15 2-in-1 (9575, Early 2018) The XPS 15 2-in-1 (9575) is similar to the XPS 15 (9560) but with a flexible