Solved Wrapping my brain around a new power supply

Trying to bring my brain up to date.
Never thought about buying a dual chamber fish tank case but I not only warmed to the idea but after watching the sales I just purchased one online last evening (Montech King 95 ARGB).
I need a new case as I have a used video card that was too long to fit my existing case.
That said I wanted to purchase a new power supply as mine is very long in the tooth and rated at 550 watts. Old enough that I cannot remember when I purchased it!

I want a modular power supply, and they are configured so different from my old one that I'm scratching my head.
Am I correct that they are basically the same except the newer versions are more efficient and might have a high-power connection for a power-hungry GPU, and vary by the amount of output connections available, and the length to fit in the new case. I'm thinking the newest ATX version 3.1 supply.

This particular used GPU is a An ASUS Strix RX5700 XT with 2, 8 pin power connectors and shows a draw of 225 watts.

I am planning on updating the motherboard processor etc. as I move up the feeding chain so I do not know what my power requirements will be. So, I'm going to err on the too much power now side.

80 Plus Efficiency Ratings:


Some suggest not buying an 80+ Bronze PSU due to cheaper components. I doubt that's based on solid engineering insight. But the price difference for better PSUs may not be high.

ATX 3.1:


You won't need a 12VHPWR or 12V-2X6 capability unless you get a newer GPU.

Your old GPU is rated at 225W.

There are many PSU calculators online. Here's one:


Looks like a 750W PSU should be adequate.

If you go with an AMD Threadripper CPU (350W) and an nVidia RTX 5090 (about 600W), I suggest a 1300W PSU or higher.

I finally decided with the Black Friday sales prices and purchased the MSI MAS 1000 GL power supply. The new fishbowl case has arrived (Montech King 95 pro). PSU expected to be here Monday Dec1.

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MSI MAG A1000GL​

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MSI MAG A1000GL​

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Correct MSI MAG 1000 GL

Smalltown said:

Correct MSI MAG 1000 GL

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That sounds it should be a good solid reliable PSU.

Thought it best to properly close this thread. I did purchase the above MSI power supply and since installing it my system that was having random shut down followed immediately by "auto" start-up has been rock solid