The thermal pad of my Flirc v1 case is gone: impossible to recycle it from my previous Pi.
I haven't another thermal pad, but I noticed that if I try to use it, the case doesn't fit very well due to the thickness.
So I decided to put some drops of my CPU thermal compound (Arctic MX-4) on the IHS and seems that it works for now.
Maximum 50°C during movie playing (HEVC x265 8-bit 1920x800 pixel) with 20°C room temperature and this settings:
For now I don't see difference in media center use compared to my overclocked Pi3 (arm_freq=1300 gpu_freq=500 core_freq=500 sdram_freq=500 sdram_schmoo=0x02000020 over_voltage=2 sdram_over_voltage=2 dtparam=sd_overclock=100).
Pi 3 B+ is unable to play my critical video (same as Pi3):
- VC-1 movie 1920x1080 pixel 8-bit color depth is stuttering (I just bought the decoder code...)
- HEVC (x265) movie 1920x1072 pixel 10-bit doesn't start (I see the play icon on the right top of the screen but nothing appens: only the system slows down).