gigabyte aorus and msi gaming x have better temps then the strix, in vrm area, aorus being best of the three and strix has the worst. your temps are within card spec, if u take a look of review from kitguru, his vrm temps were 85c, in open test bench i believe, so your being 5-6c hotter is fine i guess. however yes it could be better. if you are worried for lifespan of ur card, take a look of this video where its explained in detail when you should worry about vrm temps.
btw strix backplate has no purpose in cooling what so ever, its just for the looks, thats why they cut holes for those chips that get hot, to get some breathing area. i know my ek back plate on strix gets somewhere between warm and hot to touch when card is pushed hard. even on water block vrm's can get ''hot'' if you overclock to the limit and put card on heavy load, i know mine can get up to 48-49c in such scenarios, on profile i run for daily use, vrms max out at around 41-44c max
Last edited by Zfast4y0u; 03-22-2019 at 05:33 AM.