Hey Gang,
Question - what kind of bandwidth can you get on SlimSAS on the SuperMicro H12SSL-NT MOBO using the SuperMicro CBL-SAST-0827 cables?
Looking to build some media storage to eventually phase out our Promise Pegasus32 R8 units with TrueNas-based system.
Thanks!
PCIe Gen4 with Rome or Milan EPYCs.
Getting “good” cables on the other hand has been the Bane of my DIY home server existence for over a year now (still unsuccessful, I don’t consider connected devices to just run with PCIe Gen4 a success, I don’t want any PCIe Bus Errors) - for more details refer to this thread:
I think you are living on another planet @aBav.Normie-Pleb cause I can’t for the life of me figure out how that has anthing to do with my question? LOL 
Oh sorry, I didn’t even think of not using the ports for PCIe!
You can get around 560-570 MB/s (that’s the best I’ve ever seen with Samsung 860 PRO SATA SSDs) per drive port with the fastest SATA SSDs 
Since every connection goes directly into EPYC’s SoC you don’t have any chipset interface bottlenecks.
Ok, I know the bandwidth of the SSD devices - but the question is the SlimSAS bandwidth via the cable my friend!
These ports don’t come from a SAS controller, you can only choose between SATA/AHCI and PCIe/NVMe.
It’s only the physical connector on the motherboard end that is called “SlimSAS”.*
When using them for SATA 3 just multiply the number of drive ports with 6 Gb/s.
*There sometimes are motherboard variants that have a proper SAS controller chip onboard as an additional feature, but not the model you’ve refered to.
So you know that 8 drives on this cable will support 8x6Gbs or you are speculating?
That’s the whole point of these break-out cables, yes. With SlimSAS 4i you can use 4 drives individually, with Slim SAS 8i you can use 8.
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