By KBC Associate 
You may have heard of MediaTek’s Dimensity 9400, a flagship SoC launched last year, and the Dimensity 9400+, a higher-bin version of the 9400 that was announced a few weeks ago. You probably haven’t heard of the Dimensity 9400e, unless you’ve read our recent report on the upcoming vivo X200 FE which is rumored to use it.
Basically, the 9400e will be the lower-bin 9400 – the 9400+ is the top of the family, the 9400 is in the middle, the 9400e is the lower-end version, but still very much top of the line. And now OnePlus is rumored to put the Dimensity 9400e in the next Ace 5 device, which will join the already available Ace 5 and Ace 5 Pro.
OnePlus Ace 5 Pro
The performance of the Dimensity 9400e is expected to be better than that of the Snapdragon 8 Gen 3, which also inevitably means it will beat the recently announced Snapdragon 8s Gen 4 as well. That said, to us the 9400e seems like a direct response to Qualcomm’s 8s series, for what is probably a lower price (if we go by general Dimensity 9 series vs. Snapdragon 8 series price trends).
Source (in Chinese)