HP D4300-69001 - Processor board with a single 166MHz Pentium processor - Processor Board (with Single 166MHz Pentium Processor IC) - Plugs into the System (Mother) Board (2 Can Be Used) Retail
HP D4304-69001 - Processor board with dual 166MHz Pentium processor - Processor Board (with Dual 166MHz Pentium Processor IC`s) - Plugs into the System (Mother) Board (2 Can Be Used) Retail