Adaptec 2820SA User Guide - Page 21
About the Adaptec 4805SAS, The Adaptec 4805SAS is a SAS RAID controller with these features
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Chapter 3: About Your RAID Controller ● 21 About the Adaptec 4805SAS The Adaptec 4805SAS is a SAS RAID controller with these features: Mounting bracket Alarm connector Two 4-wide internal SAS connectors Mode 0 Flash connector Activity LED connector (top 2 left/right pins) One external SAS connector Battery connector PCI-E connector Bus compatibility PCI-E x8 I/O processor clock frequency 500 MHz Standard cache 128 MB DDR21 Maximum number of disk drives 8 (or up to 128 with expanders) SAS cables included 2 (internal) Battery backup module Adaptec Battery Module 600 (sold separately-see page 18) Audible alarm Yes 1 256 MB also available Note: Although this controller has an onboard speaker, you can connect it to an internal speaker with these specifications: 3.0 V, 90.0 mA. The internal speaker is not required, as the onboard speaker volume is appropriate for most environments.