Well worth considering is a Solid State Hybrid Drive (SSHD)"Would a 512GB SSD + external USB drive not perform similar to the 128GB+2TB fusion drive?
Assuming almost all data would be kept externally, surely the fusion route would be better?"
NO to both questions.
Fusion is never "better".
Rather, it is (was?) a "stopgap solution" to eking more speed out of the lower-priced iMacs without putting an SSD into them.
The "fastest way" would be an iMac with an SSD inside, and then attach fast USB3 storage OUTSIDE. The external drive can be an SSD, or even an HDD. But DON'T "tie it into" the internal SSD using fusion.
Fusion can only slow an existing SSD down.
This is a 100% certainty.
But i assume that the FD is faster than a HD right?
Are there any downsides to the 1TB FD that are installed in the 3.4, 3.5 and 3.8GHz iMacs?
Macs with pure SSDs are custom build-to-order configurations usually ordered directly from Apple.I dont think there i an option for a pure SSD!
That and speed. The 21.5" has HDDs that are physically smaller and slower. The 21.5" iMac Fusion drives are SSD + 2.5" 5400rpm HDD while The 27" iMac Fusion drives are SSD + 3.5" 7200rpm HDD which are almost twice as fast.What does the 21-5" screen has to do with the drive, is it a matter of space?
What happens on the 27" i mac?
I dont think there i an option for a pure SSD!
[doublepost=1526447437][/doublepost]What does the 21-5" screen has to do with the drive, is it a matter of space?
What happens on the 27" i mac?
How much faster is that solution? Is it really worth it?Put your OS and apps on and external SSD drive and boot from that. Use the internal HD for data storage.
What i was asking is how much faster is to boot from an extSSD drive, compared to the a FD thats built in the iMac ;-)You are a doubting Thomas.
An SSD, internal or external, is up to 6X faster than the slow laptop style 5400rpm slow as molasses hard drive. An external will run at about 85-90% of the speed of the same SSD internally. Watch this for comparison:-
If there is a difference, I suspect the FD would boot faster since its booting from an internal SSD. The issue with Fusion really is the small SSD size on most of the options compared to the larger SSD only option. My personal use makes my Fusion 2TB setup fine for me since all of my data fits easily on just the 120G SSD. I see fast boot time and fast use times. If I were using my computer for a different task maybe it would make a much bigger difference.What i was asking is how much faster is to boot from an extSSD drive, compared to the a FD thats built in the iMac ;-)
About 32GB. The 2TB option is 120GB.What is the size of the SSD on the 1TB FD drive?
But i assume that the FD is faster than a HD right?
This thread has got me scratching my head now. I am looking at buying a new iMac to replace my old MBP and was going to get the 2TB FD version. It's and extra £1260 UK for a 2TB SSD. Are the FD's really that bad??