I don't have the Aorus but I have 6 of the Gaming OC variant. All my memory runs into the 100-110C range if I don't turn up the fan speed. I pulled one apart to make sure it was pasted correctly and make sure the thermal pads were making contact properly. They were, so it's just a power issue with the 5700 XT. If you can get mem voltage down that should help, but try increasing fans to at least 45%.
I tried to undervolt with AMD Memory Tweak XL but unsuccessful. I get 92 C after increase fan speed to 1800rpm. What is ur mem temp now?
BTW could you post your core/mem/volt/speed and power consumption (both inapp & at wall)?
I didn't bother with mem voltage because I was able to get temps down to 90C which I'm OK with because there isn't much thermal cycling. I'm running 1230 core @ about 735 (varies based on silicon lottery), 1780 mem but I BIOS modded the 1550 Hynix straps for tighter timings, I was able to get same MH/s with lower ram speed, 54MH/s at pool end, 105W per Phoenix. I didn't bother to measure at the wall because I was in a hurry to get sustained uptime over profits.
The tighter timings allowed me to clock the RAM down to 1780 and still get a good rate. When we get our 3 days of winter here in Los Angeles I'll bump the memory up a bit, but for now this is the best I can get when we have ambient above 90F everyday.