AMD shares hit an intraday high near $558 on June 15, pushing the chipmaker’s market capitalization above $900 billion for the first time. The catalyst is a familiar one: AI.

The milestone caps a stretch of aggressive momentum that saw AMD’s valuation approach $850 billion earlier in June. In roughly two weeks, the company tacked on another $50 billion in market cap.

The Samsung deal fueling the fire

On March 18, AMD and Samsung Electronics signed a Memorandum of Understanding at Samsung’s Pyeongtaek facility. The agreement designates Samsung as the primary supplier of high-bandwidth memory, specifically HBM4, for AMD’s upcoming Instinct MI455X GPUs.

Samsung’s HBM4 targets performance metrics of up to 13 Gbps and 3.3 TB/s bandwidth. The deal also covers optimized DDR5 solutions for AMD’s sixth-generation EPYC “Venice” CPUs and the company’s Helios rack-scale platform.

AMD and Samsung have collaborated for nearly two decades. Samsung previously served as the main supplier of HBM3E for AMD’s earlier generation accelerators. The new MOU is an escalation of that partnership, not a cold start.

Why memory matters more than ever

The broader semiconductor industry is experiencing a memory-driven valuation surge. Micron has seen its own valuation approach $1 trillion as demand for AI memory solutions accelerates.

For AMD specifically, the MI455X GPU represents the company’s next major play against Nvidia in the data center AI market.

What this means for investors

The Samsung MOU adds supply chain support to AMD’s position. The MI455X GPUs need to deliver on their performance promises, and the HBM4 memory from Samsung needs to hit those 13 Gbps and 3.3 TB/s bandwidth targets at scale.