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Hotswappable compute modules. Labels on each unit read ampquotAMD Opteronampquot ampquotCRAY XT COMPUTE MODULEampquot ampquotXT CPMampquot ampquotP ampquot ampquot. Quad Core GB ampquot ampquotRELEASE LEVER TO INITIATE HOT SWAPampquot. Each is labelled with unique numeric identifier ampquot ampquot ampquot ampquot etc. from bottom