Not that high. On my evga 3090 xc3 ultra hybrid I have this memory temps even with an additional backplate cooler on warmer days. Msfs is a killer on that side, it drives the gpu harder than any mining ever could.
To illustrate this: For port royale benchmark I run this gpu with 1950mhz/+1200mhz ram with ease but in msfs I have to stay around 1750mhz meanwhile to avoid overload indicated crashes.