OptiPlex 745 Refurbished Desktop PC Review & Specs
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For more details on Dell systems that run Windows Vista, seewww.dell.com/vista.
Memory
Dual Channel DDR2 Shared Memory DDR2 memory architecture enables systems to improve performance and reduce power consumption. The amount of RAM you have determines how many programs can be executed at one time and how much data can be readily available to a program. It also determines how quickly your applications perform and how many applications you can easily toggle between at one time. Simply put, the more RAM you have, the more programs you can run smoothly and simultaneously.
SATA 3.0 provides 2X the bandwidth of SATA with a transfer rate of 3.0Gb/s.
Benefits of the SATA II drives offered on the OptiPlex 745 is that they enable:
Password protection feature on the HDD. A password must be entered before the HDD can be accessed and the system boots. This provides an extra layer of data security.
Faster, Improved data integrity, and Improved scalability
Dual Channel DDR2 Shared Memory 
300KB)