I bought Chui Hi Go directly from Chuwi on February 11. Receive just last week but now I´m trying to return it cause it has just a black screen. See my complain at Chuwi Hi 10 Go (N5100) on pwr on, just black screen and blinking leds - #6 by FabioRPereira. So, if you buy directly from Chuwi, problably you will get the N5100 version like me. Chuwi probably already sold all N4500 stock.
But if you buy from other retailer, like aliexpress (Chuwi oficial Store) you can receive the N4500 version. Look to the auction Chuwi hi10 go 10.1 "fhd (1920x1200) ips tela intel celeron n5100 cpu 6gb ram 128gb rom windows 10 tablet com micro hd|Tablets| - AliExpress on Q&A There is a reply to the question: Is the processor n5100 or n4120? N4500. Reply given on February 8.
But, would you buy Chuwi after see this forum?