54 PowerEdge R620 Technical GuideRack rail specificationsTable 35 lists the spacing dimensions for the R620 sliding and statics rails.Table 35. Rail adjustability rangeProduct Railidentifier Rail typeRail adjustability range (mm) Rail depth (mm)Square Round Threaded withoutCMAwithCMAMin Max Min Max Min MaxR620A7 Sliding 681 868 667 861 681 883 7201770284518952A8 Static 608 879 594 872 604 890 622 —1For 8-drive bay chassis2For 10-drive bay chassisThe adjustment range of the rails is a function of the type of rack in which they are being mounted.The min-max values listed above represent the allowable distance between the front and rearmounting flanges in the rack. Rail depth without the CMA represents the minimum depth of the railswith the outer CMA brackets removed (if applicable) as measured from the front mounting flangesof the rack.The rail depth changes based on which version of the R620 is being installed. Although the 10-drivebay system is 50 mm deeper than the 8-drive bay system, both are able to share the same railsthrough a new self-adjusting feature included on the rails.USB peripheralsUSB peripherals are supported through the front and back USB ports on the R620. These ports areUSB 2.0 compliant.PCIe card dimensionsTable 36 provides the dimensions of the PCIe cards supported by the R620.Table 36. PCIe card dimensionsType Height LengthFull-height, half-length card 111.15 mm (4.376 inches) max 167.65 mm (6.600 inches) maxFull-height, full-length card 111.15 mm (4.376 inches) max 312.00 mm (12.283 inches) maxLow-profile, half-height card 68.90 mm (2.731 inches) max 167.65 mm (6.600 inches) maxNote: ¾-length is 234mm (9.213 inches)