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Old 04-12-2012, 07:49 AM   #1
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Join Date: Jun 2009
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Default Win 7 superfecth/prefetch in hybrid system (SSD + HDD)

I've read a ton of stuff about this but no one seems to have a clear answer. It is in general recommended (also by intel ssd toolbox) to turn superfetch and prefetch off if you have an ssd. But I also have applications, especially games, on a normal HDD. So therefore I believe I would benefit from these technologies.

Also some people claim superfetch does nothing even if it is turned on if it determines that the drive is fast enough. With "the drive" I assume the OS drive is meant.

Has anyone here played around with superfetch settings? (eg 0,1,2,3)

I'm also uncertain what the downside of superfetch is? I mean RAM i still much faster than an ssd so why turn it of at all?
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Old 04-12-2012, 09:14 AM   #2
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Superfetch consumes I/O bandwidth. If you have a situation where minimizing I/O bandwidth usage is important (e.g. large-scale VDI, remote iSCSI volumes, etc.), disabling Superfetch may improve performance. Otherwise, I don't see any reason to disable it.
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Old 04-13-2012, 11:02 PM   #3
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The Windows 7 blog has a post about what they did to support SSDs in Windows 7, and in there they mention that Windows itself may disable SuperFetch on an SSD if it's fast enough.

I am of the mind that this is just one of the many completely unneeded SSD "optimizations". Just leave it alone and you'll be fine.
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Old 04-15-2012, 09:21 PM   #4
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superfetch and disk defragmenter ignore SSDs drives. You may leave it on, it will work on hard drives that you have on system.

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