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Years ago, Intel released a tool that would check for the flaw. I could not find this tool on the Intel site but, being the pack-rat that I am, I do have a local copy of the tool. I am attaching it. Run this tool and you will know for sure where you stand.
If you have a board with the bad stepping and you are committed to its purchase, your best option is to purchase an add-in card that can be used in replace the chipset's SATA ports. I have personal experience with one of these cards, Amazon.com: StarTech.com 4 Port PCI Express 2.0 SATA III 6Gbps RAID Controller Card, and I have used it successfully with an older 5 Series board, so there shouldn't be any compatibility issues with 6 Series boards. This card provides 4 SATA III ports. If you need more ports than that, I found one that would seem to fit the bill: Amazon.com: IO Crest SATA III 8 Port Controller Card PCE-e x2. If you go for this card, remember it is a x2 card and thus needs to go into the x4 PCIe slot on the OW board...
Hope this helps,
Thanks for your reply - unfortunately the attached exe won't run on my machine (maybe because I'm on Windows 10? Not sure, it just said the platform was wrong.) Cheers for sharing anyway. Having done a bit more digging online I've managed to check the sSpec code on the PCH (SLJ4D) with the codes on the Intel ARK and it matches up to the B3 stepping - so finally, a bit of peace of mind! Wasn't too keen on having to disturb the heatsink etc., but it wasn't too much trouble. Between that and the AA number I think it seems much more likely that it's just CPU-Z misdetecting the stepping of the chipset. The Hardware ID reported by the storage devices still matches the B2 ones - perhaps that was never changed and that's what CPU-Z is looking at.
PS. Cheers for the pointers re: SATA cards too. Actually part of the reason for getting this board is to eliminate an old JMB366 SATA card which wouldn't work with Storage Spaces for some odd reason. But I'll keep that 4-port card bookmarked for when I expand again.