Assuming 25 new computers, your loads per phase will increase from 7.5A per phase to 17.5A per phase. Still significantly less than the 80A per phase (100A x 80%) that the PDU can tolerate.
Although the load per phase may almost double, if you can keep the loads balanced per phase, I would be interested in how the neutral current would be effected. I would expect the neutral current to remain pretty constant or reduce.
