Oct 15 (Reuters) - An investor group, including BlackRock and Nvidia (NVDA.O), will buy Aligned Data Centers from Macquarie Asset Management (MQG.AX) in a deal worth $40 billion, the companies said on Wednesday, as AI infrastructure expansion powers on.

The deal underscores an intensifying race to expand the costly, supply-constrained infrastructure required to develop artificial intelligence technology, as companies rush to build sophisticated AI models.