Unless you have a habit of writing large quantities of incompressible data to the SSD, or will frequently be writing lots of large files to the SSD the speed difference is not noticeable in real-world use.
Technically:
■The Pro uses a slightly different controller which can better handle incompressible data.
■The Pro uses MLC NAND (2 bits per NAND cell). The EVO uses TLC NAND (3 bits per cell). MLC is faster than TLC. So the EVO initially writes data to NAND in MLC mode (or even SLC mode - I've read conflicting reports). Then while the drive is idle it rewrites this MLC data in TLC mode. If you're writing a lot of large files or continuously writing a lot of data, you can exhaust the space the EVO has reserved for MLC writes...
Unless you have a habit of writing large quantities of incompressible data to the SSD, or will frequently be writing lots of large files to the SSD the speed difference is not noticeable in real-world use.
Technically:
■The Pro uses a slightly different controller which can better handle incompressible data.
■The Pro uses MLC NAND (2 bits per NAND cell). The EVO uses TLC NAND (3 bits per cell). MLC is faster than TLC. So the EVO initially writes data to NAND in MLC mode (or even SLC mode - I've read conflicting reports). Then while the drive is idle it rewrites this MLC data in TLC mode. If you're writing a lot of large files or continuously writing a lot of data, you can exhaust the space the EVO has reserved for MLC writes, and it'll end up writing in slower TLC mode. https://www.pcworld.com/article/2998497/storage/tlc-nand-ssds-the-crippling-problem-storage-makers-dont-advertise.html