I'm going to give this a try as EWBF is only giving me this on a 4 GPU system:

Temp: GPU0: 59C GPU1: 65C GPU2: 69C GPU3: 64C
GPU0: 259 Sol/s GPU1: 265 Sol/s GPU2: 261 Sol/s GPU3: 262 Sol/s
Total speed: 1047 Sol/s
+-----+-------------+--------------+
| GPU | Power usage |  Efficiency  |
+-----+-------------+--------------+
|  0  |    220W     |  1.18 Sol/W  |
|  1  |    144W     |  1.84 Sol/W  |
|  2  |    170W     |  1.54 Sol/W  |
|  3  |    144W     |  1.82 Sol/W  |
+-----+-------------+--------------+

GPU0 is a 1080Ti and the other 3 are 1070's

I'm expecting around 1800 Sol/s (according to whattomine)

BTW, the zm.exe scan's mostly clean using virustotal, score is 4/68

https://www.virustotal.com/#/file/39209c0077e1fc42a5f511ac9e81817073a8d4623ebfc57fbec3308f96457316/detection