Performance decrease when adding new GPUs

[mapminer]

Hi,
I’m starting in the wolrd of mining…
I have a rig with a B250-btc 12p and a 2400W server PSU.

I started with just 1 3090 GPU and gave me about 125MH/s…
So I added another 3090 GPU, then with same OC I couldn’t get higher than 118MH/s on both…which is not bad anyway.

Now I have added a 3060 Ti which makes 60MH/s (Good!), but the other 2 x 3090 GPUs went down to 110MH/s… Power used per GPU also decreased… Why?

I have to say that any of the cards share any power cable nor the risers…

My OC for the 3090 are :
109.2 MH 48° 80% 279W 80 -100 2600 305

why is this happening? Does it have any reason? Any better OC for the 3090?

Thanks

[rkulov]

try absolute core clock setting.
try core clock 1100.

[mapminer]

setting absolute values did not help…

[rkulov]

If needed set up higher core clocks . Play with them ot should work