model of the XPS series that features an Intel dual-core Pentium D 950 processor, dual Nvidia GeForce 7900GTX in SLI mode, 7200 RPM SATA hard drive, and dual-channel DDR2 RAM. This case has not changed significantly over the past several generations, with the large aluminum plate on the front. Discontinued a few days after XPS 700 launch and succeeded by the XPS 700. XPS 625 A version of the XPS 630 but with AMD Phenom II chips and ATI Graphics. XPS 630 This 2008's desktop at one time filled the gap between the media-oriented XPS 420/430 and the high-end XPS 730x. There is no physical difference(s) between the 630 and the 630i. The marketing concept was to use an "i" to designate systems installed with an Intel chipset, and an "a" for systems with AMD-installed chipsets, but since Intel-based chipsets were the only models ever sold, this designation holds little significance. The 630 features a Dell-modified Nvidia nForce 650i chipset that supports both SLI and CrossFire configurations, but lacks ESA certification (the only ESA-certified component in the 630i is Dell's "Master Input/Output" (or "MIO") printed circuit board). The XPS 630 at one time came standard with an Intel Core 2 Quad Q6600 CPU and dual Nvidia GeForce 8800GT graphics cards. Problems and solutions There were several issues with the XPS 630 including problems with the chassis fan control, chassis LED lights, and non-shipment of the LightFX 2.0 lightshow control software. limited PCIe slot configuration (8,8,1,1 unlike OEM Nvidia 650i SLI motherboards which also offer the 16,1,1,1 configuration), constant HDD LED activity, and a reliability issue due to a problem inherent in the Nvidia 650i SLI chipset that can surface when overclocking with 4 or more gigabytes of RAM. The problems resulted in PC PRO revoking their Recommended award for the system. The July 22, 2009 release of a Softex Media Plug-in has provided some of the features originally advertised in LightFX. BIOS updates were issued to patch the constant HDD LED activity. Some 630i owners have bypassed the aforementioned problems by swapping out the Dell-modified 650i motherboard with OEM motherboards such as the EVGA nForce 780i SLI FTW. The motherboard has 8 lanes wired for each PCIe slot, which can restrict performance if using a single high-performance graphics card. Performance is equivalent to other systems with 650i chipset motherboards when using two graphics cards in SLI mode. XPS 700 series