Fusion drive versus ssd drive issues

What do you mean by compare?

A Fusion Drive has an SSD+HDD (you probably already knew that).

So, you want to know how to determine speed of a Fusion Drive (SSD+HDD) versus a separate SSD and HDD?

A fusion drive will be a little faster than a HDD and a SSD will be a lot faster than both, especially if it's connected via PCExpress 2.

Lanny wrote:

A fusion drive will be a little faster than a HDD and a SSD will be a lot faster than both, especially if it's connected via PCExpress 2.

I agree with the second half of your statement but my experience with the fusion drive VS a standard 5400 RPM HHD is that it is significantly faster, not a little. Apple has managed to find a good balance between permanently storing often used items on the SSD and using it for buffering.

With the cost of SATA SSDs relatively low today I consider that just using an SATA SSD is more practical unless you use a fast PLCe-based fusion drive.

When fusion drives were first introduced SSDs were very expensive.