Samsung 850 EVO 1 TB or Samsung 950 PRO 512 GB

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NonTechSavvySheep

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Apr 15, 2016
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Both of them price similarly, the difference is not that much. Is Samsung 950 PRO much faster than 850 EVO in real world scenario? I know that in benchmark it is much higher and faster read write (2500 MB/S) However if it does not give me noticeable speed from 850 EVO, I might as well forget the NVMe M.2 and stick to SATA III. I would get twice the storage at the same price and the endurance is better on larger capacity. Correct me if I'm wrong. Samsung 950 PRO has thermal throttling (overheat)?
 
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Solandri
Wait time (how much time you spend waiting for the drive to read or write a file) is the inverse of MB/s. So all those MB/s benchmarks are actually backwards from how fast the drive will "feel" in real-world use. For reading a 250 MB file:

125 MB/s HDD = 2 seconds
250 MB/s SSD on SATA 2 port = 1 second
500 MB/S SSD on SATA 3 port = 0.5 seconds
1000 MB/s early PCIe SSD = 0.25 seconds
2000 MB/s modern PCIe SSD = 0.125 seconds
2500 MB/s top of line PCIe SSD = 0.1 seconds

Notice how every time you double MB/s, the reduction in wait time is half that of the previous doubling. So those huge 2000-2500 MB/s benchmarks really aren't as impressive as their big numbers make them seem. Put another way, when switching from a HDD to a...
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Solandri

Solandri

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Jan 4, 2012
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Wait time (how much time you spend waiting for the drive to read or write a file) is the inverse of MB/s. So all those MB/s benchmarks are actually backwards from how fast the drive will "feel" in real-world use. For reading a 250 MB file:

125 MB/s HDD = 2 seconds
250 MB/s SSD on SATA 2 port = 1 second
500 MB/S SSD on SATA 3 port = 0.5 seconds
1000 MB/s early PCIe SSD = 0.25 seconds
2000 MB/s modern PCIe SSD = 0.125 seconds
2500 MB/s top of line PCIe SSD = 0.1 seconds

Notice how every time you double MB/s, the reduction in wait time is half that of the previous doubling. So those huge 2000-2500 MB/s benchmarks really aren't as impressive as their big numbers make them seem. Put another way, when switching from a HDD to a SSD:

HDD to 2500 MB/s SSD gives you 100% the speedup
HDD to 2000 MB/s SSD gives you 99% the speedup of the 2500 MB/s SSD
HDD to 1000 MB/s SSD gives you 92% the speedup of the 2500 MB/s SSD
HDD to 500 MB/s SSD gives you 79% the speedup of the 2500 MB/s SSD
HDD to 250 MB/s SSD gives you 53% the speedup of the 2500 MB/s SSD.

So really the bulk of the speedup (wait time reduction) comes from the lower MB/s levels. The NVM SSD will only be noticeably faster if you're frequently reading or writing huge files. Things like real-time video editing, copying movie or backup files from one NVM SSD to another, etc. Unless you frequently do one of those tasks or have gobs of money, I would just get the EVO.

(MPG has the same problem - it's the inverse of fuel economy. So even though the Prius' big MPG numbers make it seem like it's saving a lot of gas, it's actually not. The bigger MPG gets the smaller the fuel savings, or put another way the bulk of the fuel savings comes at lower MPG. Basically every person you can convince to switch from a SUV to a sedan saves more than 2x as much fuel as every person you convince to switch from a sedan to a Prius.)
 
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