New Gaming Build help please

Dec 31, 2020
It's been a while since I built a PC. But I poked around a few years back with bitcoin mining so I bought 3 Radeon R9 290's. So I got everything together and running I just have a couple questions. Here is what it's running...

MPG Z390 Gaming Edge AC
I-9 9900K
1300 watt digital Power Supply
16 GB Ram

1st question, can someone recommend cooling for this processor? I'm thinking about getting liquid cooling setup. Also, does the board need the 2nd power plug. I believe it's labeled as CPU 2 with 4 pins. I didn't see a plug for that in my wires for the PS so it's not plugged in right now. And the main thing, I have 3 of the R9 290's. Would it be worthwhile to run them all 3 together "crossfire" or should I just find a better GPU all together? It's been a couple years ago when I got those, so I'm not sure how outdated they are now. Typically the day after I spend 1000 dollars they come out with a better soooo yeah... Any help or tips would be greatly appreciated. Thank you all in advance.

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