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Oh I get you. Yeah, it might not have the SATA 3 spec which was released in 2009 but at worst, it will be SATA 2 so you should get 300mbps.
Still worth getting an ssd, basically.
I'd go with an 850 evo or pro - the 840 evo has a pretty terrible design flaw that slows old data dramatically. Newer ones seem fine. Samsung still seem to have the best track record regarding firmware, reliability etc.
Any SATA drive is compatible, so yea, the Samsung will work. You might need some torx keys to get in there.