EDIT: Solution found.  See my post about 7 messages down

OK this just bugs me and I need to ask.  I have 2 rigs that mine.  Most of the cards are gtx 1060s, but each rig has gotten a new gtx 1070.  An Asus 1070 something gaming card, the other A Zotac 1070 Amp edition.  Both are factory overclocked and boast almost identical specs.

Why would the Asus average 400 sols/s Equihash, and the Zotec only 325 Sols/s?

I mean that is a huge difference for a card that is running at the same same GPU clock, same mem clock.  The only difference is the zotec is connected using a PCI riser.  But I have never noticed them cause performance issues before.  Drivers up to date, both on gen 6 intel i series processors, systems are spec'd out similarly.

Thanks for your thoughts, because I am perplexed...