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Is the crucial M4 faster than the V3 or 4?

If you want speed and don't mind being treated like a lab rat, OCZ has you covered. Just don't be surprised if the company changes hardware parts while keeping the same product codes as before, and expect people to not see a difference.
 
faster no. much more reliable, yes
the samsung 830 is also reliable and faster

Much more reliable? Evidence?

I had the model before the M4, the C300 and it was excellent. Now running a couple of Vertex 3s and they're also excellent. In order of speed you could probably rank them like this: M4<Vertex3<Vertex4/Samsung830

Any of these drives will be great, you really wouldn't notice the difference between them so I would suggest getting whatever is cheapest for the capacity you need. 256GB Samsung 830 is a good price as is 512GB M4.
 
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