It was an AS6104T upgrade. In terms of hardware specs per dollar, the AS5304T is hard to beat. The only area to complain about is the lack of SSD slots to improve NAS performance. As advertised by ASUSTOR, swapping drives from one device to another resulted in all my settings and data being migrated with no issues. Since I have yet to take advantage of the 2.5Gbe capabilities, there was no noticeable improvement in network file processing performance over the AS6104T. I suspect the AS5304T will do better than the AS6104T for streaming or internet services. Overall this is a great product so far. I'm excited to see my wired and wireless file transfer speeds improve when I eventually upgrade to a 2.5Gbps router. Greatly improved large file performance in 2.5GBe mode. Small file performance is about the same, but that's to be expected. This is definitely a very powerful NAS.
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