3.5" SATA III SSD are still constrained by the 6Gbps SATA III bus. If your motherboard supports hardware raid 0 on two separate SATA channels, there is small improvement to be had. This is especially true with large TLC and QLC writes when SLC cache runs out. 40->80MB/s is a lot better than 20->40MB/sSteveRNG :Is that a typo? 3 SSDs in Raid 0? I mean, it's possible, but I don't see many people wanting that much speed with no fault tolerance. Of course, most people will never pay this much so...
There is a lack of benefits to RAID 0 with SSDs. Some might even perform worse (mainly NVMe SSDs) in RAID 0 than alone.
RAID is really now only beneficial for servers and SANS/NAS. And only in redundant configurations like 5/6 etc.