First, thank you for finding the ASUS Hyper Kit.
I'm going to investigate it for when I swap out my Z87 mATX motherboard, currently in my Mac Pro case, with my GENE in the near future.
Second, I gave the wrong product link in my previous posts. I have this SAS/SATA converter cable and adapter:
http://www.maxupgrades.com/istore/index.cfm?fuseaction=product.display&product_ID=330&ParentCat=332. I am using this in my Mac Pro Case Mod which uses the Z87MX motherboard's SATA ports.
You are now out in front of everybody else.
If the Hyper Kit card outputs SAS, you just need to plug the Mac Pro case's SAS cable into an adapter cable (mini SAS to SAS). However, if you use the Mac Pro case's SATA "plugs", then you're only limited to the speed of the SSD/HDD that use those SATA connectors. Unfortunately, I don't know of any drive that uses the SATA connector that is faster than SATA III's 6GB speed. Another question is does the Hyper Kit card support more than one SAS device at once like the Apple Mac Pro case's SAS to four SATA connectors?
If the Hyper Kit supports four SATA drives as does the Mac Pro motherboard, then you won't need the MacConnect PCI card.
Wow! The ASUS Hyper Kit could be coolest accessory to our Mac Pro case mod projects...and it's not that expensive. I'll have to get a M.2 to PCI adapter card for my Samsung 950 Pro.
For US readers:
ASUS Hyper Kit:
https://www.asus.com/Motherboard-Accessories/Hyper_Kit/
Amazon:
http://www.amazon.com/dp/B00ZONEZMM/
Newegg:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813995042
Update: The more I read, the more I'm convinced that the Hyper Kit was designed to only support one SAS device, like the Intel 750 SAS SSD blade. (See this Anandtech article:
http://www.anandtech.com/show/9453/the-asus-tuf-x99-sabertooth-review. Search for "hyper." It's at the third occurrence.) Too, bad, because the price is right. Sigh... So, for Mac Pro Case mod'ers, the
MacUpgrade's solution appears to be the best solution since you can still use the M.2 motherboard slot for a M.2 SSD blade and not lose the 2nd PCI graphics card slot.
However, for our GENE, and similar mATX motherboards with the same layouts, the MacUpgrades card goes in the 2nd PCIe slot thus turning both PCIE slots 1 & 2 into 8x speed slots as per the GENE's User Manual at the bottom of page 1-19. Ugh! I don't like the trade-off here for our GENE. I thought that SATA PCIe card shown in the MacUpdate's link came with the SATA to SAS cable and converter. I should have had more coffee before I responded this morning.