Ryzen 7 7745HX performance debut: Lenovo Legion Pro 5 16 Gen 8 laptop review

[moare HDMI infos]

The HDMI Forum allows calling any HDMI 2.0 port HDMI 2.1 now (true HDMI 2.1 is called HDMI 2.1a). So what's the bandwidth of these HDMI 2.1 ports?
I want to connect a LG OLED C3 42" to watch 4K60Hz HDR content and use full/normal 4:4:4 chroma. This requires 15.68 Gbit/s: en.wikipedia.org/wiki/HDMI#Refresh_frequency_limits_for_HDR10_video, which the HDMI 2.0 can NOT provide.

This is how one calculates this value btw:
15.68 Gbit/s (15.678432 -> 15.68) = ((3840+80)*(2160+62)*3*10*1*60)/10^9.
* 3 is bits per pixel
* 10 -> 10 bit (required for HDR)
* 1 -> full 444 chroma (for 422 use 2/3 and for 420 use 1/2)
* 60 means 60 Hz
* +80 and +62 come from the CVT-R2 timing format

For full 120Hz 10bit HDR 444chroma 32.27 Gbit/s are required.
((3840+80)*(2160+127)*3*10*(1)*120)/10^9 -> 32.27 Gbit/s.
HDMI 2.1 FRL4 (32G) can only do 104.7 Hz in this case.
HDMI 2.1 FRL5 (40G) can do 129.3 Hz, so would be enough in this case.

[desktop gaming is cheaper]

I'm just a sane expert who understands that all "gaming" laptops are essentially nonsense, invented by marketers. Waste of money.

[..]

Correct, the same gaming performance in a desktop form-factor can be get at only like 0.5 to 0.2 the price or 2 to 5 times the performance for the same money. And, assuming one plays modern games which are GPU-bound (=no need to update the CPU after on next generation), one can simply exchange the GPU for like 600 bucks (say a RX 7800 (XT) 16GB VRAM). This kind of performance in a notebook equals roughly to a 4090 Mobile (and also 16GB VRAM) and the cheapest notebook with it costs 3200 (since it's the cheapest notebook, one should verify that the 4090 Mobile is not power limited), this is 5 times more expensive for same performance! I play on a desktop PC btw.

A gaming notebook is, neither here, not there: Too heavy to be truly mobile and too expensive for what kind of gaming performance one gets. Better: APU-only notebook like a Ryzen 7040 Phoenix APU (its APU can still play many games at 720p high to very high and 1080p mid to high settings) + desktop PC for gaming at home and freedom from disturbance.

[desktop gaming is cheaper]

But make sure the RAM is dual channel (something like 2x16GB 5600MHz CL38 or better CL) (2x8GB isn't that good because some of it will be split between the iGPU and OS) and that the BIOS allows to set the APU's VRAM much higher than say 256MB or 512MB, as 512MB VRAM would be just laughable.

[desktop gaming is cheaper]

and that the BIOS allows to set the APU's VRAM much higher than say 256MB or 512MB
Some/many? support the allocation of 4GB or 8GB of RAM to the iGPU as its VRAM. The setting is sometimes called UMA Frame Buffer Size. If your notebook doesn't support such values (I'd prefer 8GB, not only 4GB), I would not buy such a notebook.