SSD cashing for large quantity of small files database type.

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Yes, it will help a lot. Here is some performance info to put SSD vs HDD in perspective:

Firecuda 530 IOPS. = Random Read / write 1,000,000 IOPS
Data transfer speeds MB/s read/ write 7300MB/s / 6900MB/s

HDD performance
WD Red Pro 6TB. = 1,541 IOPS write and 2,602 IOPS read
READ / write speed = 214 MB/s

I hope this helps.