Why run 4 on your i5 and a separate one for your GPU?
The client should automatically detect your CPU as multi-core and use the SMP settings which will automatically utilize all 4 cores and if you configure it to use a slot for GPU it will run all within the same control client.
Runnning multiple instances of the client will actually perform worse than using just the one.
What is your PPD like?
on an I5 stock you should be getting at least 12K per day
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