Yes, depending on the Fans and the temperature at the radiator 3 fans are enough.
I use server cases so always 1 good 3 fan radiator.
On my 3080s i have got ek waterblocks.
0: Msi NVIDIA RTX 3080 10GB 94.02.42.00.F7 1155/10425 100.06 MH/s 228 W 54℃ / 0%
1: Msi NVIDIA RTX 3080 10GB 94.02.42.00.F7 1155/10425 100.07 MH/s 217 W 54℃ / 0%
2: Msi NVIDIA RTX 3080 10GB 94.02.42.00.F7 1155/10425 100.07 MH/s 222 W 52℃ / 0%
3: Msi NVIDIA RTX 3080 10GB 94.02.42.00.F7 1155/10475 100.59 MH/s 210 W 45℃ / 0%
400.78 MH/s 917 W
Nice setup!
I guess you're using Hive, so no memory temps on Nvidia? Lock your core at 1080-1100, it should improve a bit. I also guess you're in much cooler climate than I am.
Thanks for the compliment. I'm also planning to but that EK double pump you mentioned while ago, just to have it as a spare. But right now 2 pumps in series do the job just fine, backing each other up.