If you want a solid explanation it would be best to wait till the consoles are out.

Could be a bad translation. Could be because the engine is scalable, could be nobody here speaks or understands Chinese so nobody can answer you.

Don't make a big deal out of it.

- Running in a notebook with inferior hardware he archived 40fps at 1440p.
- Lower graphics and details due the lower hardware

So people (reddit) assumed it was running at same quality/detail as PS5 demo and made the claims.

It is an opinion of someone, but it is probably so.

I think people were confused by an event where the VIDEO was played on a laptop.

— Tim Sweeney (@TimSweeneyEpic) May 16, 2020

Never said anything to the contrary. A 2080 Max-Q can give an RX 5700 a "run for it's money". - Doesn't mean beat it.

Just this demo is "un-optimized".

You assume the demo is using the full power of the Playstation 5 and is perfectly optimized to take advantage of all the hardware. (The proof is... It's not. It doesn't use Ray Tracing cores for example.)

The PC also needs less reliance on I/O because it has more fast Ram than consoles.

It's not impossible to run on that class of laptop given the level of optimization going on here. But you are right, pinch of salt and all that.

Unreal Engine tends to be really well optimized for PC's, especially PC's with nVidia hardware, nVidia does allot of driver optimizations for that particular engine and has always worked closely with EPIC, always has, even back in the Geforce FX days.

At the ending years of next gen this demo will probably look outdated compared to what the games will show us then,just like the U4 trailer compared to games coming out now.

By the way, everyone seems to have forgotten about the next gen XBOX.

You're probably right. The biggest take away is that Sony's SSD tech isn't just there for giggles and does a lot more than just shaving off a couple of seconds of loading time. It's going to be interesting to see what Sony's 1st party studios can do with it with their own propitiatory engines.

Despite You ignoring it, my point still stands. There is fraction of the fraction of one percent PC users who has multi SSDs in RAID0, what makes them irrelevant. Mainstream is what matters. There is one more thing. PS5 is equipped with controller with 12 Direct Memory Access channels, not to mention hardware compression/decompression, coherency management etc. All that together makes it a top solution at the moment. Not only transfer speeds. 

That's correct , PC will relied more on system ram , Vega GPU has what it called HBCC , i believe RDNA 2 will feature this costume to be available on the GPU and Nvidia will relied on more VRAM and some sort of bigger L chace .

But it still need to fill that 16 GB VRAM on the fly in less then a second , i bet 64 GB or 128 GB DDR4 is still not enough unless some assets are compress and GPU raw power help with the decompression.

According to the guy at unreal engine, it was running at 1440p and 30fps, near the gpu max on ps5. Can you make a game of this scale with alot of onscreen action, multiple npc and particle effects? I guess with this engine we can forget about getting games looking like this running at 60fps. maybe if they drop the 8k textures to 4k. Or with more console optimisations. I wonder if mesh shading/variable rate shading works with this tech.