Here is a quick post listing out all my graphics cards/GPUs and what hashrates I've been getting. This is a constant work so these rates may change up/down daily as I find ways to tweak them.
Mining Ethereum using Genoils console software, connecting to ethermine.org pool:
2 x GTX 1070 8GB - combined average of 59.5 MH/s (overclocked +450 Mhz on memory clock only)
2 x GTX 970 4GB - combined average of about 7MH/s (just got these and trying to tweak them, many have this same issue)
1 x GTX 960 4GB - average 11 MH/s (overcocked +50Mhz on proc and +500Mhz on memory)
1 x AMD Radeon R9 390x 8GB - 28.5 MH/s (base GPU overclocked memory to 1560Mhz (+60))
My combined hashrate jumps as high as just over 110MH/s, but my averge is around 100MH/s
Mining with lower end GPU for Monero using Minergate GUI or Console:
2 x GTX 960 2GB - combined 280 kH/s (base no overclock)
1 x GTX 960m 2GB - 58 kH/s
1 x GTX 730 4GB - 3.3 kH/s (will not mine ethereum even with 4GB memory)
I also run all of my processors across 5 desktops, 1 laptop, and 6-10 android devices between 60-85% processor utilization for Minergate GUI or console for Monero.
Hope this gives you guys some ideas on output ideas for your systems and encourages you to get to mining.
Boris
When overclocking I usually don't overclock the GPU memory as it really doesn't show a big difference, I only overclock the core clock as that jumps my hash rate up significantly. I have 2 x R9 390 one OC to 1175MHz core clock, getting me 33Mh/s, and the other at 1120MHz, 32Mh/s. Both give me 65Mh/s, that's without touching the memory speed, leaving it at 1500MHz.
Hope this helps with getting better speed.
Very helpful. Thanks for the information in a detailed and easy to understand format @brutalboris!