Not all chips are equal , there is some variance tolerance but I think he's doing something wrong to only get 740kSomething might be wrong with your phone mate. I'm on weekly EU with 250 ish apps and my ambient temperature is 35 degrees celsius and I still got 810k with all the apps running in the background and only 2gb of free ram. (As you can see from my status bar). My CPU did hit over 60c and my battery peaked at 45c.
I do get higher scores at around 835k to 840k on CN/Global but the difference is not that significant to bother. I tried on gaming/gaming2/dynamic/pubg/default thermal config and they all yield similar scores within 3% margin of error.
I am someone that use my phone for streaming, heavy gaming, video editing and also videography. The phone performs as intended on both stock or EU based ROMs.
Plus, I'm running the lowest end variant aka 8/256gb.
Either something is wrong with your settings or your ambient temperature exceeds 40c.
Thats performance a SD 870 could almost reach