At a speed of 91.09 Mb/s it should only take 54 minutes to download 300GB of blocks.
It is megabits isn't it? Should take a few hours. J1900 also has 4 cores and threads.
Judging by your specs, the synchronization would be extremely slow. If you're not looking to do anything else other than receiving/sending Bitcoins, I would recommend you to just take a look at SPV wallets like Electrum. The limited ram and your computer specs would certainly guarantee that the synchronization will be way slower when you get nearer to the latest blocks.