Can't tell for sure but I use 7700 non-T but with copper heatsink that I had to buy separately. Mine idles at or under 40C. Also has 10gbe NIC in there and 1 NVME. I think I did briefly try it with default aluminum one but that was years ago, I just remember that fan was unable to cool CPU but whether that was in idle I can't now tell. And I have P320 not M710q but they are all practically identical. Yeah I had to buy copper heatsinks for these 1LPCs to use best non-T CPUs. For 7th and 9th gen. T parts should be able to be cooled by default sink because they're 35W not 65W... Are you sure CPU is indeed idle?