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In a nutshell, it won't be as fast, but depending on the size of the SSD portion of the drive, it should be tolerable.
 
I use the original Fusion Drive in my Late 2012 iMac, and use a SSD in my MacPro 1,1.

IMO, I would stick with the SSD.

The Fusion drives suck now considering they have smaller SS portions vs the Fusion Drive I have.

I have the better Fusion Drive, and I still wished I would have went with the SSD.
 
I use the original Fusion Drive in my Late 2012 iMac, and use a SSD in my MacPro 1,1.

IMO, I would stick with the SSD.

The Fusion drives suck now considering they have smaller SS portions vs the Fusion Drive I have.

I have the better Fusion Drive, and I still wished I would have went with the SSD.
Thanks, all. I'm now glad I didn't jump for the Fusion drive model.
 
Thanks, all. I'm now glad I didn't jump for the Fusion drive model.
Pretty much anyone here is going to tell you to go to the SSD route.

Im one of them after being an initial fusion drive defender.

I know they are expensive but in the long run it’s worth it. OSX is slow as hell whenever it needs to write to the HDd portion and when it needs to swap.
 
Is this with 128gb SSD? I'm wondering if the 2TB with 128gb SSD would be enough.
Yes, this is with the original 128 GB SSD.

And no, it was not enough, as you would notice a slow down on things that were not done often. For example, a few years ago, I was playing WoW often, and the load screens were very short. I have stopped playing, but still pay for a few accounts for my daughters. Logging into the game now, the load screens are much longer.

Another example is restarting the iMac. Since I leave my Mac running for weeks/months at a time, if I ever have to restart, it is very slow to do so.

But, I am recommending a SSD vs the Fusion drive for other reasons too. One being that the Fusion drive has moving parts, and is more likely to fail.

I had the HDD fail in my iMac's Fusion drive, it was partially failing for about a year before it fully died. The Apple Store refused to replace the drive because it kept passing their hardware tests. Luckily, it died completely 12 days before the Apple Care expired.
 
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