I am building an internal raid 6 array inside of an Early 2008 Mac Pro (3,1). It is running the latest OS. I bought an ATTO R644 card and 4 3TB UltraStar disks (though I ordered 3gb/s drives instead of 6gb/s drives by mistake). The OS lives on an SSD that is enclosed in the optical bay and connected directly to the mobo.
Before I take the machine apart and start the installation I am wondering if I need a mini-SAS extender to connect the ATTO card to the back-plane. I will be installing the card in a x8 slot, and I am not sure how long the internal cable is. If I do need it, does anybody know of a retail location I can get one from in the SF Bay Area?