I'm not sure about melting a $1,000 smartphone with this game. If you want to melt a SD865+ device, try TauCeti Vulkan or Madout City II.
I have a unlocked LGv40 i got brand new for $250 over a year ago and it runs the game maxed out just fine. Being that the Adreno 630 in the SD845 has 512 ALU's at 710MHz it really shouldn't have any issues.
The Adreno 630 has exactly half the ALU's as the Adreno 650 in the SD865/+ (1,024 ALU's). Qualcomm started to use 2GB's of V-ram in the Adreno 630 and they still use 2GB's in the Adreno 640 and 650. Of course they won't ever tell you that. They won't even tell us the ALU count. But, luckily we found a way. The Adreno 530 had 256 ALU's, the 630 got bumped up another 256 giving it 512 ALU's and the Adreno 640 got another 256, giving it 768 ALU's which is rated at 900GFlops. Did i lose you guy's yet.
The overclocked Adreno 640 in the SD855+ was the first SOC with a mobile GPU to pass the 1Teraflop of FP32 compute barrier. Not sure why they didn't market that. A 1 Teraflop GPU is more than enough for mobile. The stock Adreno 630 rated at 730 GFlops is plenty still yet. I think the SD845 and Adreno 630 is still a strong combo in gaming because it has the 2GB's of V-ram. That way it doesn't have to take from the CPU's pool when the V-ram buffer runs out. I noticed that on the Adreno 530 which has 1GB of V-ram. That with a 2K screen is primed for 17fps territory when your trying for 30.
The Adreno 530 GPU was plenty fast enough at 1080p but, newer more graphically demanding games would cause it to chug. And it wasn't anything to do with thermals because on every device i get i set the the thermal thresholds way up or change the thermal.conf.file's temperature parameters so the GPU never throttle's.
I actually ROOTed the LGv40 with the ROG Phone 1 2.96GHz clock mod and got the 4HP cores running at 2.96GHz and the Adreno 630 running at 825MHz giving just over 850Gflops of FP32 . Also, uppng the thermal throttling limits or removing them all altogether. It runs unoptimised games a little better but, not much of difference worth the battery drain. What worked well was giving the LGv50 the ROG Phone II clock mod treatment. Since the v50 has a 4000mAh battery and one of the densest Vapor Chambers made, a overclock to the CPU and GPU wouldn't hurt to much. So, i now have a LGv50 with a SD855+. I could tell the difference on that SOC. If i were looking for a new phone with a fast chipset and some gaming chops, i would look at some SD855+ devices. Either that or a cheap SD865 device. If you can't afford a new phone get a older flagship. I still use my LGv40 daily and it hasn't stopped me from playing any game or running any app. Take this info however you want. Just spreading the Knowledge, not misinformation.