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FusionIO and SSD are one in the same, both run on NAND technology the only difference is the fusionIO system has its own builtin array for redundancy and controlling. It utilizes the PCI-E bus for the throughput, normal SSD drives are locked into sata/sata3 3/6Gbps throughput where a PCI-E x4 link will push 16Gbps and has a controller that can handle the IO.
So yes in theory a good enough raid card that has 4 drives should be able to out perform a funsionIO setup, say each drive is a 6G/s drive and 4x = 24Gbps given the raid card can control the IOs.. the advantage over this a 3ware/LSI raid card runs on PCI-E x8 which is 32Gbps so the raid card/drive to PCIE bus is no where near saturated at 24Gbps.
So could ssd/sata3 drives outdo a fusionIO setup? sure if you throw enough drives at it, but at what point does the storage vs cost + performance become your break point?
Every tool has its job.. Just keep that in mind.
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