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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.