SSD 850 EVO 500gb vs SSD970 EVO 1TB speed

Why would you expect it to be much faster?  What is the specification of the storage controller you connected your drives to?  Knowing what to expect can determine if there is problem or not.

The benchmark results from your post are just for marketing.  A highest capability at most favorable conditions at the shortest time.  They are meaningless in many applications and certainly impractical for comparison, because not all files are in sequential.

For a more proper comparison, you can select a large folder of several GB, containing many different types of files to use for copying in file transfer test.  Recording the average MB/s transfer speed.  Repeat the same test process for the other drive.  That will be the partial result of real life performance for your drives.  To complete the test, you must perform both read and write with file transfer between internal vs. external, over network, over USB, over media (card reader, CD/DVD).

At the end, you will see that the benchmarked sequential numbers meant nothing.

The difference between 7000M and 3000M transmission rates cannot be reflected in most daily software. Relatively speaking, the impact of MLC particles and TLC particles on lifespan is more important.

@hpfish10 I think something is wrong with your benchmark results for the 850 EVO. The Samsung 850 EVO (both the M.2 and the 2.5") has a SATA 6 GB/s interface. The sequential read performance should be 540 MB/s max. Try and see what performance results you get with the Samsung Magician software.

To add to what @Vic384 said, is BIOS set to RAID or AHCI? - Do NOT change that setting.

Samsung SSDs don't play nicely when BIOS and Windows are set to use RAID, which is how Dell shipped the XPS 8930...

@Vic384​ 

I just did benchmark using Samsung Magicuan:

@RoHe​ 

I have not touched the Bios, but will check it. 

@hpfish10 I quality of your images makes it hard to read, but it appears you have an older version of Samsung Magician. The latest version is 8.0.0. My BIOS is set to AHCI. My Dell is an XPS 8910. A long time ago with the BIOS set to RAID, Samsung Magician would complain.  Here are my results for Samsung Magician and CrystalDiskMark for my Samsung 850 EVO 2.5".

@Vic384​ 

thanks, I reran with latest Magician and it seems ok.