The Sun 501-2976 Cpu/Memory Board , 83Mhz(St286-B3-1C)(P-Udt-1C) (P13A-2C)511 is in in stock at Calhoun Technologies. For over 10 years Calhoun Technologies has been saving companies likes your up to 80% off list price on hard to find computer hardware. Manufacturer: Sun Part Number: 501-2976 Details: Sun 501-2976 Cpu/Memory Board , 83Mhz(St286-B3-1C)(P-Udt-1C) (P13A-2C)511