What does "the new GPUs out of the box" mean in"So although these new GPUs out of the box?

Question

have some of the highest measures of raw processing power ever witnessed, how do they perform when embedded within a system?"
PS.:GPU=graphics processing unit

Answer 1

They're saying that the GPU itself has lots of processing power, but the reviewers wanted to test how it performed inside a system (i.e. did the rest of the system keep the GPU from performing at its full potential?).