Limit to number of SSD's HP Z420v2 will recognize?

Hi GreenPC Gamers. I have built a high-performance gaming machine based on the HP Z420v2 motherboard. I'm running in AHCI mode. I currently have two SSD's and one Optical DVD/CD/Blu-Ray drive installed and all are recognized. When I try to add a third SSD the system simply doesn't recognize it. The BIOS/System Setup doesn't see it, Windows 10 doesn't see it, and my AOMEI Partition Assistant doesn't see it. All my SSD's are GPT and formatted NTFS. Any thoughts? 

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