My 5950x 8tm. 2 can only write 4.5t a day and write 10 pictures simultaneously. After that, the speed of SSD drops seriously

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I drew eight pictures on a 4T SSD. If I continue to draw on the remaining 4T SSD, all of them will lose speed
My SSD is 2 + 2，1 + 1，1 + 1 three raid0
5950x 128g ram