Hi,
As per the specifications, it's not recommend mixing PSU of different ratings.
https://portal.nutanix.com/page/documents/details?targetId=Power-Supply-Replacement-Platform-v59:Power-Supply-Replacement-Platform-v59
A Nutanix block contains two power supplies that provide power to all nodes in the block. Both power supplies must be the same type.
If you are using 208V input power, the two power supplies are redundant. One power supply can meet the needs of the block. Although losing one of the two power supplies does not impact the operation of the Nutanix block, a failed power supply should be replaced as soon as possible to restore redundancy.
If the input for the power supplies is 110V, the power supplies are not always redundant. For specific platform details, refer to the Power Supply Unit (PSU) Redundancy and Node Configuration topic in the System Specifications.
If the PSU is not available from Nutanix, you can try sourcing it from SuperMicro.
F>P