Not sure about the 1070's but here's what I get with the Aorus 1080ti (just tested to see how far it can go).
So, 80% tdp -100 core +1000 memory (max) gives 39.5 mh/s (however after a few minutes CPU starts to overload with high usage from afterburner. If I close it I'm left with the System process hogging the CPU (a cheap celeron skylake). +600 memory gives 36 mh/s and no CPU overload.
Wonder where the problem is. Too weak CPU?
try
0 core
+800 ram
even though eth like ram more then anything
it needs some core.
if core is too low it limits the max hash
what miner claymore?
if claymore try -ethi 16 in the bat.
I will try a rig with a better cpu. to see if I can create your problem
I am doing 2 msi aero 1080 ti at
75% tdp
174 core
860 ram
75% fan
and getting 38.5 on claymore with a -ethi 16 setting
using an intel i3 6100t
and cpu usage is 9%
I now bumped to 975 ram
and cpu usage is now 24%
so I would say using a shit cpu is your issue note i did this on win7
more testing weaker cpu and high ram clock = no go.
the better the cpu the closer to high ram clock , but in my case it seems that stable memory max is about 860 even with a i3 6100t gives me 38.5 mh.
but at 600 memory and a core of 58% it gives me 36.2