Can you use the Hydra chip with 1 card as well?

for what purpose? :)

Drivers?

to do what exactly?
Hydra is a multiGPU technology... the drivers do load balancing between two video cards... why install those drivers if you're using 1 videocard?

Some cards are performing better with Hydra drivers... it's all bout the little extra points... could be nice if it also boosted single card setupsssss... but that might be too far fetched...

it would not be too far fetched, just simply illogical ;)

Check out your scores Teemto, you need to recalculate one.