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Corsair 4000D Airflow ATX PC Case - 4 Fans....where to place them?

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I bought the Corsair 4000D Airflow case and have four 120mm fans.  Where should I place them?  Components below.  And...side question;  About to put the whole thing together and it's my first time since 2008 doing so.  Any techniques you would apply to this?  For example, based on the mainboard (MB) looks like I'm going to have to OC the ram in the MB software I read.  Also wondering where should I install the OS...on the 970 or 980?  Anything else you'd do different?  Not too late to add or replace an item.  Thanks all!


AMD Ryzen 9 3900X 3.8 GHz 12-Core Processor    
Cooler Master Hyper 212 RGB Black Edition 57.3 CFM CPU Cooler
MSI B550-A PRO ATX AM4 Motherboard  
Corsair Vengeance RGB Pro 32 GB (2 x 16 GB) DDR4-3600 CL18 Memory
Samsung 970 Evo Plus 2 TB M.2-2280 PCIe 3.0 X4 NVME Solid State Drive          
Samsung 980 1 TB M.2-2280 PCIe 3.0 X4 NVME Solid State Drive     
PNY XLR8 Gaming REVEL EPIC-X RGB GeForce RTX 3070 8 GB Video Card 
Corsair 4000D Airflow ATX Mid Tower Case       
Corsair RM850x (2021) 850 W 80+ Gold Certified Fully Modular ATX Power Supply    
Microsoft Windows 11 Home Retail - Download 64-bit

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