It is not hard to create a RAID array with 2.5 Pb capacity.

The trick of the human brain is that the "processing power" is enmeshed into the "memory", so the brain must have a colossal computational bandwidth, even with pretty slow neurons. I suppose that bandwidth is larger than that of most modern GPU / TPU clusters, which also don't feature anything comparable to 2.5Pb or RAM in their disposal.

The revolution should be mostly in the architecture, much like the deep learning evolution was enabled by GPUs.