Agreed, SSDs are simply not cost-effective at this point. 1.5TB costs something like $6000-6500 - no good.
I'm pretty sure the RAID processor would max out before the PCIe bus is saturated. A gen-1 8x PCIe slot provides 2GB/s bandwidth in both directions (wikipedia) and gen-2 should be double that. These are close to the rates of DDR2 memory and I doubt RAID cards are designed with these kind of numbers in mind.
I'm pretty sure the RAID processor would max out before the PCIe bus is saturated. A gen-1 8x PCIe slot provides 2GB/s bandwidth in both directions (wikipedia) and gen-2 should be double that. These are close to the rates of DDR2 memory and I doubt RAID cards are designed with these kind of numbers in mind.
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