I have put together a new Eth mining rig, it's currently has 4 3070's. Problem I'm having is with 1 GPU in, I get 52-62 mh/s depending if overclocking, when I put an additional GPU in it says they are doing roughly 27 mh/s each, 3 GPU's in it says I'm doing about 18ish mh/s each, and 4 in I do about 12-14 MH/s each. I don't understand but it seems like with every GPU I add, my MH/s cuts in half.

Any help would be very much appreciated.

CPU: i-3 10100f
Ram: 8gb @ 2666 ddr4
Windows 10
GPU's: 4 EVGA ultra gaming 3070's
PSU: 2x 750w Corsair CX750m
4x risers

Hi All, hoping someone can shed some light on this as I'm losing my mind. I am trying to run 4 3070's to mine Eth and just finished new build. When I have 1 GPU connected, after some tweaking I can get it to 55-60 MH/s, but when I connect the other 3 GPU's, I get roughly 10-13 mh/s on each of them.

Here's some screen shots.

https://imgur.com/MVVhn9g with 1 gpu connected.

https://imgur.com/HRUqO4d with 4 gpus

https://imgur.com/0A2tRaa 4 gpu's

https://imgur.com/b3CV5Xn 4 gpu's with overclocks. still only 70 mh/s total.

https://imgur.com/GZqrwJU 2 gpu's with no over clocks..

Edit:
4 GPU's without overclock was getting about 11-12 mh/s or about 1/4 of a single gpu.

Decided to try with 3 cards. Getting about 18ish mh/s without over clocks so essentially 1/3 of the single GPU

and 2 gpu's connected is going 27 mh/s without overclocks.

Any ideas would be greatly appreciated.