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They say the Intel Arc B570 is good value. I have the A750 and have been rather pleased so far.

If you get lucky you can find a 3060 12G card.

200 Euros? You aren't going to get anything new for good value with that budget, unfortunately. You're looking at a minimum of 2 generations behind current.

RTX 30 series cards (although avoid anything with less than 8GB VRAM if possible), equivalent AMD gpus, or anything from Intel ARC with decent VRAM could fit the bill, all of it would be used though.

VRAM is usually your bottleneck when it comes to cheap cards, so look out for anything with at least 8GB.

It depends on the games you want to play. Maybe the Intel Arc B570 with 10gb VRAM is a good place to start: https://de.pcpartpicker.com/product/Yvbypg/acer-nitro-oc-arc-b570-10-gb-video-card-dpz4cwwp01 Although it seems only one shop has it for under 200 right now. Other shops have it slightly above, at 230 or so. At that price range, you could get a pretty good AMD RX 6600: https://de.pcpartpicker.com/product/NdvdnQ/asus-radeon-rx-6600-8-gb-dual-video-card-dual-rx6600-8g If you must stay below 200, maybe the Nvidia RTX 3050 with 8gb VRAM is an option: https://de.pcpartpicker.com/product/ZPP8TW/asus-dual-oc-v2-geforce-rtx-3050-8gb-8-gb-video-card-dual-rtx3050-o8g-v2 (note that there are 6gb variants of this card too, which are a bit cheaper).

Otherwise there is not much you can do. Maybe look at used cards instead.

I got an open box Sapphire RX6600 for 200 USD out the door at micro center earlier this year.

Maybe not the best option at the moment, but the GTX 1660 TI was a really good value for a long while. About the same power as a 1070. Could probably get one cheap used.