02-15-2021, 04:44 PM
Qnap TS-251D is indeed their latest model with up to date hardware inside. It is capable of transcoding 4K and several FHD streams simultaneously. But DS918+ and DS718+ feature 4 cores allowing to transcode even more streams. Synology 18+ series feature J3455 CPU with a benchmark score of 2132 which is around 30% faster then 251D with a score of 1552.Even though Qnap TS-251D feature newer graphics chip, the DS718+ can handle mode video formats. A very important difference is H265 10bit decoding. This is a popular standard for new 4K TVs with HDR support.I hope this helps.