Suggestions for new case fans

[DFriedo]

Hello

Not so long ago I've built my first gaming PC.

When playing games I noticed that my GPU becomes very hot (about 76-80 Celsius) and I want to replace the fans that came with the case for better cooling. (NZXT H500i)

My case supports 1x120mm (rear) & 1x140mm/1x120mm (top) fans. I need some suggestions for good fans, and do you think I will need to buy an adapter in order to connect them to my mobo?

Also, I have the NZXT Kraken X62 AIO cooler, and I was wondering whether I should change it's fans to better ones in order to get maximum cooling?

 

Here are my specs:

PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 7 2700X 3.7 GHz 8-Core Processor  ($299.99 @ Amazon) 
CPU Cooler: NZXT - Kraken X62 Rev 2 98.17 CFM Liquid CPU Cooler  ($149.89 @ OutletPC) 
Motherboard: Gigabyte - B450 AORUS ELITE ATX AM4 Motherboard  ($100.86 @ Newegg) 
Memory: Corsair - Vengeance LPX 16 GB (2 x 8 GB) DDR4-3000 Memory  ($109.99 @ Amazon) 
Memory: Corsair - Vengeance LPX 16 GB (2 x 8 GB) DDR4-3000 Memory  ($109.99 @ Amazon) 
Storage: Addlink - S10 240 GB 2.5" Solid State Drive  ($33.88 @ Amazon) 
Storage: Seagate - Barracuda 2 TB 3.5" 7200RPM Internal Hard Drive  ($54.99 @ Newegg) 
Video Card: Gigabyte - GeForce RTX 2070 8 GB WINDFORCE Video Card  ($498.99 @ SuperBiiz) 
Case: NZXT - H500i (Black/Blue) ATX Mid Tower Case  ($99.99 @ Amazon) 
Power Supply: Antec - High Current Gamer Gold 750 W 80+ Gold Certified Fully-Modular ATX Power Supply 
Total: $1458.57
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-03-09 10:57 EST-0500

Any help would be appreciated.