Service Manual
Page 104
... the processor, before you purchased the new modules from Dell. Vostro 220 and Vostro 220s can accommodate four DIMMs; The recommended memory configurations for Vostro 420 are: 1) A pair of matched memory modules installed in DIMM connectors 1 and 2, or 2) A pair of the slowest module installed. NOTE: If you remove your computer may not start properly. If possible, do not pair...
... the processor, before you purchased the new modules from Dell. Vostro 220 and Vostro 220s can accommodate four DIMMs; The recommended memory configurations for Vostro 420 are: 1) A pair of matched memory modules installed in DIMM connectors 1 and 2, or 2) A pair of the slowest module installed. NOTE: If you remove your computer may not start properly. If possible, do not pair...