The HP 321745-B21-CARD is available from Calhoun Technologies. Calhoun Technologies can helped companies like yours save up to 80% on IT equipment. Our experienced and knowledgeable sales executives are ready to provide quick response to your needs for servers, storage and networking equipment. Brand: HP Part Number: 321745-B21-CARD Details: Fc Fibre Channel Signal Conditioning Mezzanine Card (1X Card