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"so for a 1TB SSD you need 64GB RAM, which costs about as much as the SSD."

In my experience this is not true. A 1 TB SSD, even commodity hardware, is pretty expensive. And that's not even talking about high performance SSD's like Fusion IO, where you're now talking about 10K+. Where do you see 64 GB of RAM costing that much?

Micron unveils 1TB SSD for $600, which is about what 4x16GB ECC RAM is...


Fusion IO is probably as expensive as RAM, so only makes sense for apps that really need persistence, ie databases.

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