Can anyone tell me if the difference with the Samsung 850 EVO Basic (500GB, 2.5") is very big? I would like to install one of the two in my Mac book pro (early 2011), as it is very slow...

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The difference: It is not primarily the speed that is completely different, but the continuous load capacity. Due to the slightly different memory technology, the PRO models can be used almost in continuous operation, such as in a server. Hence the significantly longer warranty. Because unlike magnetic HDs, the memory cells of SSDs cannot be written to as often as you like. At some point they are effectively "dead". The SSD manages all this itself, and through sophisticated distribution to all cells, a relatively long service life and safety is achieved. 
The magazine c't had an exciting article on the subject about 3 weeks ago (the whole article must be purchased as a PDF): https://www.heise.de/newsticker/meldung/SSDs-im-Stresstest-mit-ueberraschenden-Ergebnissen-3580824.html. 
Conclusion: As a user of a single PC or laptop, you will hardly notice much difference in performance. But the PRO is simply a good deal safer. (But that doesn't make the Basic insecure!).

About the MacBook Pro: Unfortunately, forget it. You can't install another SSD in the new Macs. Besides, the form factor is wrong. It should be M2, which looks like a DDRAM stick. But I think I read that Apple uses a similar, but more proprietary format. So unfortunately there's no way to upgrade internally. As an external hard drive in a housing with a USB connection it is of course possible.

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There is a BIG difference between the 850 EVo and 850 PRO!
1. both have different types of memory cells, the 850 EVO is TLC and the 850 Pro is MLC. 
2. the speed due to larger amounts of data (the 850 Evo has an additional cache buffer which decreases after X GB with the data transfer)
3. for which application do you need your MAC and which OS is running on it ?

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So in the real world there is hardly any noticeable difference in speed, except perhaps with special applications. But the Pro version comes with a 10-year warranty instead of 5. That will mean something.

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For the first time, MacBooks have as much memory as possible. - In some cases this is 16GB, even if there was "only" 8GB ex works. Memory advisors from well-known manufacturers provide information. - As for the Samsung Pro SSD, I took it out again after 20 minutes in the notebook, it simply consumed too much power.

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Can anyone tell me if the difference with the Samsung 850 EVO Basic (500GB, 2.5") is very big? I would like to install one of the two in my Mac book pro (early 2011), as it is very slow...

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