I am unaware of one that boots a a1117 G5. IIRC there was a thread about getting bootable SAS drives working that would yield superior results to a potential sata1 bottleneck but will cost.IMO one would not as the SATA interface for the G5 is limited to 1.5Gbps or, in rough terms, 150MB/sec. Any modern SSD should be able to achieve this speed. A two SSD RAID 0 configuration would be bottlenecked by the SATA interface.
If there is a PCI-X based RAID card then that might work. I have a quad Z-Turbo drive configured as 4 x 512GB (2TB total) which has a benchmark read speed of 10.1GB/sec (whereas the individual drives benchmark at 3.4GB/sec). Needless to say a three times increase in speed is noticeable when working with large files.
Here: https://forums.macrumors.com/threads/sas-card-for-g5quad.2259020/page-9
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