Many memcache users are more interested in latency than in huge amounts of memory to cache. The drive you mention is 26µs [1] compared with ~22.5 ns [2], 3 orders of magnitude more.
If your application is accesing a lot of small memcache data to process a page, the increased latency will be noticed. If it's just for caching just full content (full pages) might be interesting, but then you might be more interested in something like varnish that uses regular disks and memory as cache. Whats is your use case? [1] http://www.fusionio.com/products/iodrive/?tab=specs [2] http://en.wikipedia.org/wiki/Dynamic_random_access_memory#Memory_timing -- Guille -ℬḭṩḩø- <[email protected]> :wq
