HP-PBHewlett-Packard Precision Bus
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The K250 and K260 support up to 2GB of memory, four HP-PB slots, one high-speed HP-HSC I/O slot and up to 3.
75GB of memory, with future growth of up to 16GB; a combination of up to 168 HP-PB or up to 24 high-speed HSC slots; and up to 30TB of disk storage.