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<blockquote data-quote="Lifeisabeach" data-source="post: 1643405" data-attributes="member: 38864">There's also the possibility the RAM you are using is faulty (though chscag is right... they don't normally fail out of the blue).&nbsp; How long have you had those modules and where did you get them from?&nbsp; You should always use exact matched sets of modules or problems may arise.As fot the issue with Yosemite and TRIM, I'd recommend switching to an SSD that doesn't really need it.&nbsp; OWC sells SSDs using the SandForce controller, and their stance has long been that TRIM is not only unnecessary for their drives, but can actually shorten their lives.&nbsp; I would take their word on this... these guys are experts on Mac upgrades.&nbsp; I would return that Samsung and get one of OWC's drives instead.&nbsp; I've been using one myself on the same model iMac as you for a couple years now I guess, and man oh man did that breathe some life into this!<a href="http://blog.macsales.com/21641-with-an-owc-ssd-theres-no-need-for-trim" target="_blank">With An OWC SSD, There’s No Need For TRIM | Other World Computing Blog</a></blockquote>

[QUOTE="Lifeisabeach, post: 1643405, member: 38864"] There's also the possibility the RAM you are using is faulty (though chscag is right... they don't normally fail out of the blue). How long have you had those modules and where did you get them from? You should always use exact matched sets of modules or problems may arise. As fot the issue with Yosemite and TRIM, I'd recommend switching to an SSD that doesn't really need it. OWC sells SSDs using the SandForce controller, and their stance has long been that TRIM is not only unnecessary for their drives, but can actually shorten their lives. I would take their word on this... these guys are experts on Mac upgrades. I would return that Samsung and get one of OWC's drives instead. I've been using one myself on the same model iMac as you for a couple years now I guess, and man oh man did that breathe some life into this! [url=http://blog.macsales.com/21641-with-an-owc-ssd-theres-no-need-for-trim]With An OWC SSD, There’s No Need For TRIM | Other World Computing Blog[/url] [/QUOTE]

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