dontlistentome :
That motherboard does go way back, lol. In that case, maybe look at the HD 7850 2gb. It's very similar in performance to an RX 460 and you can find them needing only one 6 pin pci-ex connector. I'm assuming your 450W has one, you don't say the make and model.
A 750 Ti also might work and it's only a bit slower than an RX 460. It has the advantage over the HD 7850 of not needing a 6 pin connector.
Thanks again for your reply!
The power supply is an standart oem and doesn't have the 6 pin connector but it has 2 free molex.
I've found a second hand 750ti (N750 Ti TF 2GD5/OC) for 50€.
Didn't found any economic 950 and the cheapest brand new 1050 (GTX 1050 2G OC 2GB) I've found costs 125€.
The rx 460 is around 100€ and the rx 560 costs 115€.
I have also found the hd 7950 around 80€ but in that case I should change my ps for sure and I wouldn't like.
Will I notice any improvement with the 1050 over the 750ti? Enough to pay more than twice? Is it good priced?
I really appreciate your answers.