Можно ли Adaptec MaxIQ подключить к Adaptec 5405?

Можно! http://www.adaptec.com/en-US/products/CloudComputing/MaxIQ/SSD-Cache-Performance/_resources/SSD_FAQs.htm?nc=/en-US/products/CloudComputing/MaxIQ/SSD-Cache-Performance/_resources/SSD_FAQs.htm

The kit can be paired with any Series 5Z, Series 5 or Series 2 Storage Controller to convert industry-standard servers into cost-effective, high-performance scale-out application storage appliances.