24) models. The 20-inch model has an Intel Core 2 Duo E4500, while the 24-inch model has an Intel Core 2 Quad Q8200. The 20-inch model has 2 GB of dual-channel DDR2 SDRAM @ 667 MHz, while the 24-inch model has 4 GB of dual-channel DDR2 SDRAM @ 800 MHz. The XPS One 20 has integrated Intel GMA 3100 graphics, while the XPS One 24 has integrated Intel GMA X4500HD graphics, and can be customized with an nVidia GeForce 9600M GT graphics card when chosen with PRODUCT (RED). The XPS One 20 has a WSXGA (1680×1050) resolution with 16.7 million colors, a 1000:1 contrast ratio, an 80° viewing angle, and a 5 ms response time. The XPS One 24 has a WUXGA (1900×1200) resolution with 16.7 million colors, a 1200:1 contrast ratio, an 89° viewing angle, and a 6 ms response time. The 20-inch model has integrated High Definition Audio and 10 watt stereo speakers, while the 24-inch model has SoundBlaster Audigy HD software with 25 watt premium JBL speakers with an integrated subwoofer. The XPS One 20 and XPS One 24 were subsequently discontinued by Dell. XPS 18 The Dell XPS 18 was announced in April 2013. It is an all-in-one computer that also functions as a large tablet. It has a screen size of 18.4 inches. XPS H Series A system that came out circa 1996/97. It contained an Intel Pentium II (Klamath) CPU, EDO DRAM, and an i440FX chipset. XPS D series A system that came out in 1997. It contained an Intel Pentium II (Klamath) CPU, SDRAM, and an i440LX chipset. XPS R series A system that was introduced in 1998. It contained an Intel Pentium II (Deschutes) CPU, SDRAM, and an i440BX chipset. XPS T series A system that was introduced in 1999. It contained an Intel Pentium III CPU, SDRAM, and an i440BX chipset. An "r" suffix was used for Socket 370 versions, while no suffix was used for Slot 1 versions. XPS B series A system that was introduced in 2000. It contained an Intel Pentium III CPU, 128 MB of RDRAM, an ATi RAGE graphics card, and an i820 chipset. An "r" suffix was used for Socket 370 versions, while no suffix was used for Slot 1 versions. Later models (especially the "R" series) had a built in DVD drive. XPS Gen 2 Included Pentium 4 processor with Hyper-Threading Technology (3.4 GHz,