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[Anandtech] Understanding Apple's Fusion Drive - Page 7

post #61 of 63
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Quote:
Originally Posted by Stealth Pyros View Post

I am honestly (being serious here) impressed with the new iMac. I can finally say Apple has impressed me with a product, and at a pretty reasonable price. $1,300 for a 21" with i5, 8GB RAM, GTX680MX, and 1TB-3TB storage options or Fusion drive all in a sickly sleek monitor. I have to give it to them on this one. I still personally wouldn't buy it out of my disgust for Apple as a corporation, but it's a very nice system. Of course you can build much better with $1,000 or even less, but it definitely won't look like that new iMac.
The 21.5 inch model offers the GT 640M not the GTX 680MX which is only available on the highest end 27 inch model as an upgrade from the GTX 675MX. Also the 1 TB Fusion Drive is only available on the high end 21.5 inch model, not the low end model.
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post #62 of 63
Quote:
Originally Posted by SectorNine50 View Post

That is caching, which is what the 4GB part of the "Fusion" system is used for (probably using Intel's SRT). The difference between tiering and caching is that the data is moved do the fast device where caching is copied. (EDIT: Just saw Ducky said that in your quote.)
Tiering allows you to use the disk space of both devices, where caching only makes the primary device's storage available.
So, basically...
Storage device one: HDD -> 4GB Cache
Storage device two: SSD
The operating system decides which device to store the data on, however the user sees both disks as one volume.

OK. So it's basically like me setting up a RAMdisk and installing my programs to the RAMdisk while storing movies and music on my HDD? Never understood what is so hard about that in the Windows world but man I can tell you in Linux it's not fun.
     
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post #63 of 63
Quote:
Originally Posted by Rookie1337 View Post

OK. So it's basically like me setting up a RAMdisk and installing my programs to the RAMdisk while storing movies and music on my HDD? Never understood what is so hard about that in the Windows world but man I can tell you in Linux it's not fun.

Not quite, because when your computer is shut down, the RAM disk and it's data disappears, but the basic concept is right.

The beauty of systems like Apples is that this is all automated. The system will gauge what files get high access times and/or are accessed out-of-sequence (ie. databases), and decide to move them to the SSD for you.

The negative of all this is that programs or files that you don't use very often, but still might require high I/O speeds, may not be available on the SSD. Although, I suppose they could give you the option to manually store things on the SSD.
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