iMac 21.5 2019 upgrade

[Marsell]

Hi guy, I’m new on Mac Os system, i own 1 macbook pro 13 2016 for 3, 4 months and 1 imac 21.5 2019
I want to upgrade from fusion drive to a blade ssd, currently i have 1tb nvme intel 660p from another laptop i had before I swapped for mac,i know is not the fastest, wich one you guys recommend is better? On Imac specs the existing pci e is only 2 bandwidth instead of 4, the 4x will definitely work but I’ll lose some speed in case this 21.5 version only work with 2x instead of 4x, I order the sintech adapter 2013-2017 MacBook version hope this will work
I was also thinking only replacing the sata hdf for a sata ssd, but I’m looking for more speed on data tranfer, becouse I noticed i not a massive difference between nvme and sata ssd on running speed
How much ram the 21.5 vesion? I know they specify 32gb but impossible to go up to 64?

 

[Fishrrman]

You'll never regret paying a little extra and getting the 27"...

 

[Marsell]

You'll never regret paying a little extra and getting the 27"...

I know but i got this refurbished from a store wich was 75% from the price, I’m thinking either upgrading the ram to 32gb and 1tb ssd and maybe also 500gb nvme, and keeping it or selling it after upgrade and getting the 27, that’s what i done with my last imac 2017 when I earned 200£

 

[Marsell]

Just finished upgrading my imac to 32gb of ram amd 1t ssd intel 660p nvme,i may also add 2tbb sshd