You’re off-topic here… We’re discussing HDR-SDR performance issues.
You want input on your purchase plan? 
There’s no way to predict how many you’ll get because of:
- Audio
- Subtitles
Video transcoding in the QSV ASIC is a small part of the whole equation.
I recommend:
- OK with the RAM and the NVMe SSD
- Get an i7-8xxx with UHD 630 GPU
a. Faster and more capable for both audio & subtitles tasks (depends on how you curate)
b. slightly more expensive but nearly 2x the proc (8900 passmarks vs 13000 passmarks
c. More Future proof due to the CPU speed and internal bandwidth
In the future, please review a thread before posting in it.
When in doubt, create a fresh thread so you don’t end up hijacking an existing one.