Hi guys

I need some help setting up my 2x systems (system 1 with 2x 6950's and system 2 with 2x 5830's) with GUIMiner.
Should I assign individual usernames and passwords (with each card setup with different names in the mining pool website) to each card or the same username and password to all cards (with only one miner registered on the mining pool site)?

Will this change my hash rate at all?

Andy