Two E5-2667 V3 ES 8 core cpu's running Wolfs GPU XMR miner average ~1150 H/s .
[19:26:35] New job at diff 100002
[19:26:35] Thread 2, (CPU): 35.40H/s
[19:26:35] Thread 20, (CPU): 37.13H/s
[19:26:35] Thread 33, (CPU): 34.98H/s
[19:26:35] Thread 28, (CPU): 35.34H/s
[19:26:35] Thread 11, (CPU): 35.95H/s
[19:26:35] Thread 4, (CPU): 36.18H/s
[19:26:35] Thread 31, (CPU): 38.17H/s
[19:26:35] Thread 25, (CPU): 36.45H/s
[19:26:35] Thread 21, (CPU): 36.10H/s
[19:26:35] Thread 26, (CPU): 35.24H/s
[19:26:35] Thread 23, (CPU): 35.04H/s
[19:26:35] Thread 17, (CPU): 35.13H/s
[19:26:35] Thread 19, (CPU): 35.69H/s
[19:26:35] Thread 22, (CPU): 34.83H/s
[19:26:35] Thread 9, (CPU): 36.44H/s
[19:26:35] Thread 5, (CPU): 35.91H/s
[19:26:35] Thread 15, (CPU): 35.49H/s
[19:26:35] Thread 18, (CPU): 35.82H/s
[19:26:35] Thread 24, (CPU): 35.23H/s
[19:26:35] Thread 30, (CPU): 34.75H/s
[19:26:35] Thread 10, (CPU): 35.69H/s
[19:26:35] Thread 8, (CPU): 36.04H/s
[19:26:35] Thread 32, (CPU): 35.52H/s
[19:26:35] Thread 12, (CPU): 34.56H/s
[19:26:35] Thread 29, (CPU): 35.68H/s
[19:26:35] Thread 27, (CPU): 37.30H/s
[19:26:35] Thread 7, (CPU): 35.57H/s
[19:26:35] Thread 13, (CPU): 35.18H/s
[19:26:35] Thread 16, (CPU): 35.43H/s
[19:26:35] Thread 6, (CPU): 34.81H/s
[19:26:35] Thread 3, (CPU): 33.71H/s
[19:26:35] Thread 14, (CPU): 37.04H/s
Yes cpu's can be viable.
EDIT: Added this from the Serve The Home forum Monero performance post.
"CPU Results (wolf's) Using (MB L3 cache/ 2) for threads
4x Intel Xeon E7-8870 V3 = 2600H/s (NB drops to 2000 over time)
2x Intel Xeon E5-2699 V4 = 1723H/s
1x Intel Xeon Phi 7210 = 602H/s (case to use nproc-1)
2x Intel Xeon E5-2698 V4 = 1572H/s
2x Intel Xeon E5-2698 V3 = 1463H/s
2x Intel Xeon E5-2690 V3 = 1100H/s
2x Intel Xeon E5-2667 V3 = 1090H/s
2x Intel Xeon E5-2658 V3 = 1050H/s
2x Intel Xeon E5-2650 V4 = 1047H/s
2x Intel Xeon E5-2650L V4 = 1031H/s
2x Intel Xeon E5-2683 V3 = 1014H/s
2x Intel Xeon E5-2680 V3 = 969H/s
2x Intel Xeon E5-2670 V3 = 969H/s
2x Intel Xeon E5-2628L V4 = 897H/s
2x Intel Xeon E5-2650L V3 = 874H/s
2x Intel Xeon E5-2630 V4 = 866H/s
2x Intel Xeon E5-2670 V1 = 829H/s
2x Intel Xeon E5-2650 V1 = 750H/s
2x Intel Xeon E5-2620 V1 = 480H/s
1x Intel Xeon D-1587 = 388H/s
1x Intel Xeon E5-2630L V3 = 334H/s
1x Intel Xeon D-1541 = 242H/s
1x Intel Xeon E3-1515M V5 = 240H/s
1x Intel Xeon D-1540 = 218H/s
1x Intel Xeon E3-1220 V3 = 186H/s (case to use either nproc/2 or nproc-1)
1x Intel Xeon E3-1245 V5 = 161H/s
1x Special CPU = 153H/s (case to use nproc)
1x Intel Atom C3338 = 77H/s (case to use nproc)
1x Intel Pentium D1508 = 47H/s (case to use nproc-1)
1x Intel Atom C2358 = 18H/s (use nproc)
ARM CPU Results (thanks Fractal)
ARM Cortex A7 (Odroid-C1) 5.9H/s (no AES)
ARM Cortex A53 (Odroid-C2) 7.2 H/s (no AES)
ARM Cortex A53 (Pine64) 12.5 H/s @ 4.1W (using AES instructions, thermal limited) 3H/W
GPU Results (ccminer)
1/4x GRID M40 GPU = 220H/s
1x GRID M40 GPU = 880H/s
1x NVIDIA GTX 1070 (ASUS STRIX) = 475H/s
1x NVIDIA GTX 1060 6GB (ASUS dual fan) = 431H/s
1x NVIDIA GTX 1060 6GB (EVGA ACX single fan) = 432H/s
1x NVIDIA GTX 1050 Ti 4GB (PNY) = 297H/s
1x NVIDIA GTX 970 (ASUS STRIX) = 375H/s
1x NVIDIA GTX 750 Ti = 205 H/s (Fractal)
1x NVIDIA GRID K520 (AWS g2.2xlarge) = 164H/s
1x NVIDIA K80 (one of two GPUs AWS p2.xlarge) = 209H/s"
Wolfs GPU XMR miner farster than xmrig?