Considering a switch to a 5090
Considering a switch to a 5090
It seems like everything is in place for a smooth build. The CPU and power supply should comfortably support the 5090. Just confirm your case provides enough space and proper ventilation, as it will likely get warm.
The bare essential for a 5090 is a 1000W power supply, and using that requires a reliable tier-A unit. The Zalman Watttera 1000W falls short of a tier-B standard. This likely explains the problems you encountered. Since your PSU is a tier-A model, it should perform adequately.