Guys what gpu to take?

Question

Video cards

Pci exp x16 v1
bp old 400 watt.
I will change iron in a year.
What kind of vidyuhi to take now so that up to 150 watts
And regular coolers are well cooled.
You need cross fire and 4k and dx12.
4-8 gb
What can you think of? Separate PSU for powering vidyuhi with external add. nutrition?
470-570? Like this?
How to navigate, because the mother is ancient, but I can take additional bp.
But how else to choose from red ones so that they don’t get too hot?
Where are these filters?
In addition to rx570, I don’t see anything for my requirements.
How do they take a fresh vidyuhi into an old PC, taking into account the growth with the replacement of the system unit?
Two red 570 paired how?
Pci v3 is important, isn't it?

Answer 1

I would advise you to change the computer first, and then buy more video, it just makes no sense not to buy at the moment, even if you buy video right now, in a year it will get cheaper in any case, plus you want additional bp to it, that's a couple more rubles. With such success, buy a percent ryzen with a built-in video core and everything else, and then vidyuhu.
And why do you need cross fire in modern realities