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I understand that Superfetch was designed to use RAM for caching with HDDs in mind due to their high latencies, something that SSDs don't have. However, I don't understand how an SSD could outperform RAM.
Does Windows 7 automatically disable Superfetch on systems with fast enough SSDs solely to free up more RAM?
Louis
Posted 2012-07-22T07:20:07.743
Reputation: 18 859
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The reason why SSD manufacturers recommend turning off SuperFetch is because SSD's can only take so many read/write cycles to the same sector before performance degrades and SuperFetch will read and write to the same sector repeatedly.
David Murray
Posted 2012-07-22T07:20:07.743
Reputation: 494
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More specifically, Superfetch won't run on drive with high random-access speed http://blogs.msdn.com/b/e7/archive/2009/05/05/support-and-q-a-for-solid-state-drives-and.aspx It will still run on other drives (if any)
– Martheen Cahya Paulo – 2012-07-22T07:55:26.7775
It is not so much that the SSD that will be faster than the RAM, but that the lifespan of the SSD will be decreased. The benefits don't outweigh the cost.
soandos
Posted 2012-07-22T07:20:07.743
Reputation: 22 744
As an aside for those new to using an SSD with Windows, it is also highly recommended that you disable Disk Defragmenter for the same reasons cited below. A new installation of Windows 7 on an SSD should have Defrag disabled when you install, but upgrading from a standard disk to an SSD will require that it be disabled manually as well. – Justin Scott – 2012-07-25T17:18:43.450