Nvidia Pascal and AMD Polaris, starting with GTX 1080/1070, and the AMD 480

Those observations move me away from thinking the host system is failing to support the card, more to the direction that the current Einstein BRP6/CUDA55 application in concert with current drivers may not find a way to deploy a substantial fraction of the computational assets of a 1080, even when it is active.  So far as I know, for GPU load purposes no accounting is made of what fraction of the computational resources are working on task at any given moment--only whether something is actively working at all.

Pretty high GPU loading reported combined with such low power consumption seems rather clearly to mean a bunch of resources are resting unused.

Even with the 1070 and 1060 full-out Einstein use at high GPU load uses much less power than reports from game reviewers, suggesting that even with them either some type of resource is little used, or else that the fraction of parallel units employed is not so high.

Bottom line, I've moving in the direction of thinking you don't have a rogue system, but rather are helping us see that 1080 is a particularly inefficient fit to the current Einstein code on current drivers.

I've started a Pascal overclocking thread.  I certainly don't want to terminate this thread, but perhaps pesky details of Pascal overclocking technique can best be added over there.  I've made eight posts with rather a lot of words--I hope they don't discourage others from contributing, arguing, disagreeing...

The next members of the Pascal family to ship apparently will be the 1050 and 1050Ti, within days.

As I have believed for quite a while that the 750/750Ti cards are remarkably good Einstein cards, with fabulous power efficiency for their generation, good Einstein performance per unit price, and easy fit into systems, I look forward to seeing actual Einstein results with these new cards.

The announced stock clock rates are pretty low compared to other Pascals.  It remains to be seen what the practical overclocking limits for memory and core will turn out to be, running Einstein.  As the memory bus is only 128 bits wide, these certainly are going to be far lower in Einstein performance (at least on the recently retired BRP6 application--which I understand better than others) than the higher grade Pascal cards, but the rumored prices are very low, with launch prices of $109 for the 1050, and $139 for the 1050Ti mentioned.

Regarding power, although both cards state a 75W TDP, they both lack a supplementary power connector, and in general the Pascal cards have been burning considerably less than TDP while running Einstein work.  It remains to be seen whether these are remotely so good a power outlier within line as were the 750s, but at least they seem likely low enough as to pose little problem of existing supply adequacy for most people considering an upgrade.

For before and after launch discussion, and links to reviews when they come out, one source is this reddit thread.

While the users who built four 980Ti cards into one system may not find these of any interest, I think people with older hardware toying with the idea of a graphics card upgrade who have some sensitivity to purchase cost and electric power operating cost may find them pretty interesting.

One real wild card in any such decisions is the unknown matter of how GPU-using applications available next year on Einstein will behave, both in terms of GPU hardware fit and in terms of host requirements.  The recent cuda55 variants of both the BRP6 and BRP4G applications have had pretty modest host impact, but there is nothing fundamental about that.  There is reason to suspect a hoped-for GW application using GPU power may have much higher relative CPU demand, for example.