Adding more SSD drives will ofcourse increse performance of your system comapred to any other drive type.
You can also consider "Volume Tier Affinity" feature as well.
You can go through below guide which will help you for better understanding,
https://h20195.www2.hpe.com/v2/getdocument.aspx?docname=a00015961enw
Hope this helps!
Regards
Subhajit
I am an HPE employee
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