Imac 5k with 1tb FUSION DRIVE 24Gb Speed Test

[Snivid]

I've been surprised with the lastest speed test done on my IMAC 5k late 2015 1Tb Fusion Drive (24gb) done a Blackmagic (version 3.0). I used to get around 350 Mb/s write and 850 Mb/read, but setting the target to icloud drive and stress of 1Gb I've got up to 1550 Mb/read and 330 Mb/write. Does anyone knows why does this happen? Does anyone gets similar results?
I Have a Mac OS Sierra installed.

 

[rbart]

When it performs the read test, the performance depends on where the data is stored.
If it's partially on the HDD or fully on the SSD ...

It's difficult to do benchmarks on FD.

 

[Snivid]

When it performs the read test, the performance depends on where the data is stored.
If it's partially on the HDD or fully on the SSD ...

It's difficult to do benchmarks on FD.

Yes I agree, I was just shocked on the performance increase up to 1575 Mb/s as I usually got only a max of 850 Mb/s and was wondering is someone got the same results after the latest Sierra update 10.12.3
All the reviews I've read about the speed of this fusion drive 1tb on the imac late 2015 was that the max read speed was 850 Mb/s

 

[rbart]

Maybe it's just a benchmark artifact ...