Questions about Samsung 860 QVO

It's an 860, so it's an old model that's more expensive than the 870, which is the new one, so why have a flash sale when it costs more than the same new one? I don't understand the illogic

Why should you buy this ssd???? I don't understand it's 21% more expensive than the qvo870 on this site and it's too expensive compared to the competing Swiss site. This ssd qvo 860 coute 220.- chf et le qvo 870 coute 188.- chf 😂😂😂 alors pourquoi l'acheter? Not forgetting the evo 870 version at the same price, which is better...

Hello, I would like to know if this product is compatible with the MSI MPG Z390 Gaming Pro Carbon AC motherboard (LGA 1151, Intel Z390, ATX) and the corcair RM850x power supply. And if so, do I need to buy separate cables or are they included in one of the three products.

What is the exact difference between the QLC (quad-level cells) and TLC (triple-level cell) storage types? Which is more recommendable? Which is faster?

Hello and good day Can anyone tell me if this SSD is compatible with a PS4. I would like to replace the HDD with an SSD. Thanks in advance for the support👍 Greetings Nuggi72