Perhaps this link will help you? http://forum.crucial.com/t5/Crucial-SSDs/TRIM-and-SSD-performance-why-is-it-important/ta-p/100276 I don't think TRIM can hurt anything. If you were to upgrade to Yosemite, then you have to disable certain security features to activate TRIM that might make your computer more vunerable. That would be a good reason to not activate TRIM. For Mavericks, TRIM should along side GC just fine.
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