Mini SAS to SATA cable - quick question

"Connectors: Mini SAS SFF-8087 (Host) to 4 x 7 way SATA latch type connectors (target) and 1 x 8 way sideband connector".

From a little bit of googling, those sideband connectors are for extenders, LEDs, connecting to backplanes, etc. You don't have to use it, if that helps deciding if you should buy one that has that connector.
 
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