Can I increase the performance of two ssds (non-bootable)?

Question

RAID

My home computer has 3 ssds.
1. The first ssd R3SL 120 GB has Win10 installed
2. The other two ssd Samsung 1 TB and Vi 550 GB are used for caching and creating draft video files. Creating a RAID 0 (compound volume in Win10) has almost no performance gain, maybe ~10-15%. The store advised me to buy an Espada PCIe4SATA3ASM controller, but they did not give any guarantees of an increase in performance.

How appropriate is it to look for means to increase the speed of the two ssds described in point 2. ?

Answer 1

answer the question, how did you determine that you do not have enough speed ?
ssd drives, even the cheapest for reading, give speeds of hundreds of megabytes per second, for writing, usually also a hundred at worst. but there is still the speed of the processor, maybe your program does not have time to process the data?

Two other ssd Samsung 1tb and Vi 550gb used for caching and creating draft video files

raid0 - combining striped disks, allows you to increase the speed by 2 times only on linear read and write operations, and on random reads of small pieces (chunk size), in all other cases, the increase in speed on random data is minimal
If the video is saved in raw ( 2-4mb for fullhd per frame and for 30fps -120mb per second) then you can load almost any disk (I remember when I played with this I combined four weak hdds so that in the end the recording speed was enough) ... but where did you get that speed for you one ssd drive is not enough? show tests

advised to buy Espada PCIe4SATA3ASM controller

you were deceived, I hope out of stupidity, this controller cannot add speed under any configurations, but vendorlock will add haemorrhoids (like any hardware controller)
moreover , only disks of equal size can be combined with a controller in a raid , only a software raid is suitable for different sizes , partition based (windows can)
ps don't use complicated filesystems like ntfs, use exfat

Answer 2

This is where you need to look at what you're getting into. If creating a software RAID0 does not work, then the "bottleneck" is not here. How do you measure performance?
The expediency is determined by the task. If you do not have enough performance of disks, then it is advisable for your task.

Answer 3

Thank you RPman!
It became clear that combining two ssds to improve performance by 2 times would not work.