To maintain the processor’s working temperature below 90 degrees Celsius, a strong CPU cooler is required. If your CPU cooler doesn’t reach 90°C when under stress or severe loads, you can continue using it. A second fan can aid and will increase airflow inside your PC case.
Ryzen 9 5900x High Temp :
Board: MPG X570S Carbon max wifi
GPU: GeForce RTX™ 3080 GAMING OC 12G
PSU: Seasonic Focus GX-1000
CPU: Ryzen 9 5900x
MEM: Kingston FURY Beast 32GB DDR4 3200MHz CL16 Dual Channel Kit
HDD/SSD: SSD Samsung 980 PRO 1TB PCI Express 4.0 x4 M.2 + SSD Kingston KC600 512GB SATA-III 2.5 inch
COOLER: Noctua Nh-D15
OC: Game boost profile enabled
OS: Windows 10 64bit Home
CASE: Corsair 4000D Airflow Max
FANS: 3 noctua fans in front, 1 in the back, 2 corsair fans on top all 120mm.
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The overall resistance in the loop and the pump power (which is often the same across models of the same type) affect flow rate (highly variable and unique). The XC7 is average in that sense even though CPU blocks are frequently the most constricting. It will depend on the specific model because radiators differ, but even in the worst situation, every D5 pump can manage two radiators, CPU and GPU blocks, and certain twists and turns. The only time performance can start to suffer is when very restrictive radiators are combined with moderately restrictive blocks.