Expandable buffer for memory transactions

A method, comprising:

• storing a first memory transaction at a first content addressable memory (CAM) associated with a memory controller;
• storing a second memory transaction at a random access memory (RAM) buffer associated with the memory controller;
• in response to determining a second CAM associated with the memory controller has an available entry, transferring the first memory transaction from the first CAM to a second CAM;
• and
• selecting memory transactions from the second CAM to provide to a memory.

A processor, comprising:

• a processor core to generate a first memory transaction and a second memory transaction;
• a memory controller comprising:
• a content addressable memory (CAM);
• a random access memory (RAM) buffer;
• a scheduler to:
• store the first memory transaction at the CAM;
• store the second memory transaction at the RAM buffer;
• and
• a picker to select memory transactions from the CAM and the RAM buffer to provide to a memory.