New CPU Seems to be unable to handle FFMPEG?

[Efficient_Good_5784]

More ram doesn't equal better transcoding support. The only time it actually provides a benefit is when tone mapping HDR content.

You "upgraded" from an 11th gen Intel CPU to a 4th gen Intel CPU.
The 11th gen you had is codenamed "Tiger Lake: https://ark.intel.com/content/www/us/en/...h-ipu.html
The 4th gen is codenamed "Haswell": https://www.intel.com/content/www/us/en/...tions.html

Look at the Intel Quick Sync table: https://en.wikipedia.org/wiki/Intel_Quic...d_encoding
You will see that Tiger Lake has way better HWA codec decode support than the 4th gen you "upgraded" to.

Also, I'm not familiar with what codecs the GTX 745 has support for, but it's an old GPU in tech years. Just because it's a dedicated GPU doesn't mean that it will actually provide better transcoding support. The i7-1165G7's iGPU most likely has way better HWA support for video transcoding than this GPU.

Finally, your new upgrade is pegging the CPU more as compared the your previous Samsung laptop's CPU because it's an older CPU. There were many improvements to the instructions per clock and clock rate since then.

I'm not trying to be mean here, but you basically downgraded here. You didn't upgrade anything other than getting more ram.