Why is the 2TB FD via PCI-Express and 1TB FD NVM-Express?
I saw that the 1 TB Fusion Drive SSD is connected via NVM Express and the 2 TB Fusion Drive Connects via PCI Express.
Isn't the NVM Express the faster connection?
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I saw that the 1 TB Fusion Drive SSD is connected via NVM Express and the 2 TB Fusion Drive Connects via PCI Express.
Isn't the NVM Express the faster connection?
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This can be a bit confusing!
First lets review what a Fusion Drive is: The word 'fuse' give us a clue here, we are linking (fusing) two discrete drives within the OS so they are seen as one.
In this case a SATA III (6.0 Gb/s) traditional spinning hard drive and either a PCIe 2.0 x 4 lane NVM-Express blade SSD (in the current model) or in the previous model a PCIe 2 lane blade SSD.
iMac 27" 3.3 GHz i5 (5K, Mid-2015)
iMac 27" 3.2 GHz i5 (5K, Late-2015)
For a comparison here is a benchmark between them:
While the benchmark shows the faster 4 lane PCIe NVM interfaced SSD is faster than the older 2 lane PCIe. The width of the connection has a lot to do with it (2 vs 4 lanes).
To be clear here you can't use the newer SSD in the older system the system does not offer a 4 lane PCIe interface.
아차! 마음을 바꾸겠습니다.
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