The problem is that not many people benchmark the write access time for flash. It's pretty bad, often 50ms+. There is a product I know of, the Zeus IOPS, which gets extremely fast write speeds to flash. Unfortunately it costs about $250/GB. For that price, you can get a RAM based solution, which is even faster. Ones like http://www.hyperossystems.co.uk/ can come with a battery backup and a hard drive that it will dump to and restore from if the power goes out. Price is about $220/GB. The prices sound high, but if you're trying to scale a database, it can potentially solve an otherwise intractable problem without any software changes.