Graphical artifacts means GPU failure. No other way around. If this persist for all other games as you claimed.
Don't make sense if you blame SSD? Mobo may be a second culprit but the GPU is more likely cause. Power supply failure does not cause this, in fact it will shut the whole system down or so.
At least ur problem isn't my kind of weird issue I facing in one of the more recent threads i posted for help.
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