Need advice for new graphics card

Hi !

I want to buy a new graphics card for 1080p gaming but I don't know what to choose from which one of the two:
Nvidia GeForce GTX 1660 SUPER or XFX AMD Radeon RX 590 FATBOY OC+.

My PC specs:
  • Motherboard: Asus Z170-A, Socket LGA 1151
  • Processor: Intel Core i5-6402P, 2.8 GHz
  • RAM: 16GB DDR4 2133 MHz SDRAM (Corsair)
  • Video card: AMD Radeon RX460 Gigabyte Windforce OC 4GB GDDR5 128bit
  • PSU: Corsair TX 650 M with 650W

1. I heard that the Nvidia GTX 1660 dominates the market now in terms of 1080p gaming. The memory type is GDDR6, with a 14000 MHz memory speed, yet with only 6GB VRAM and 192bit BUS memory.

2. The RX590 has, in general, 8GB VRAM and 256bit BUS memory. However, memory speed is 8000 MHz (or over 8000 MHz for some other models) and the memory type is GDDR5.

From what I've been told, if I were to take the 1660 one, I wouldn't benefit from its performance because of my PC specs, while the RX590 would probably be the better option. My budget is between 280$-300$. What do you think ? What are your thoughts ? Thanks !
 
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