HP B840, Intel® Celeron®, PGA988, 32 nm, Tray, B840, 1.9 GHz HP B840. Processor family: Intel® Celeron®, Processor socket: PGA988, Processor lithography: 32 nm. Memory channels: Dual-channel, Maximum internal memory supported by processor: 16 GB, Memory clock speeds supported by processor: 1066,1333 MHz. Width: 1.48" (37.5 mm), Height: 1.48" (37.5 mm)