Power Supply for DIY computer

[mansr]

What power supply is causing instability? It probably has trouble responding to sudden increases in current demand from the load, even if it can manage a steady supply at the same level.

[mansr]

1 minute ago, michael123 said:

I was not clear - that power supply (Kora MKIII) worked perfectly non-stop for 4 years. It supposedly had reserve for 25A peak, and 10A minimum 

That peak power still can't be delivered instantaneously. A sudden surge in demand will always cause a brief dip in supplied voltage. The load must either cope with this or ensure it does a gradual ramp-up of current.

 

1 minute ago, michael123 said:

Machine was was somewhat similar to published by Chris, and after few years we upgraded it for new CPU + Motherboard.

Older CPU was 35W, the new one is 65W TDP

TDP is thermal design power, the amount of heat the cooling system needs to remove to keep the system from overheating. It is an average over at least a few seconds. Momentary power consumption will at times be much higher.

 

1 minute ago, michael123 said:

The question is what do we have market to offer as a replacement for switched PSU?

That depends on the requirements. If you name the motherboard and CPU, maybe someone can suggest something from experience. Also, do you have any power-hungry components like hard drives or a GPU?