It seems we have a bug here with multi GPU. Does this difference also exist when you use olets say only 2 GPU in one instance (--devices 0,1)
It seems to be so
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New job received: e24b
Average speed (30s): 22.9 sol/s | 22.3 sol/s Total: 45.3 sol/s
New job received: e24c
Average speed (30s): 20.5 sol/s | 21.9 sol/s Total: 42.4 sol/s