Need a New Year's resolution? How about stop paying for memory you don't need
Say your workload benefits from having 3GB/thread. Using a 96-core AMD Epyc 4-based system with one DIMM per channel, you'd need at least 576GB of memory. However, 32GB DIMMs would leave you 192GB short, while 64GB DIMMs would leave you with just as much in surplus. You could drop down to 10 channels and get closer to your target, but then you're going to take a hit to memory bandwidth and pay extra for the privilege. And this problem only gets worse as you scale up.
"Maybe the system has to down clock that two-DIMM-per-channel solution, so it can't run the maximum data rate. Or maybe there's a performance implication of having uneven ranks in each channel," he said. The calculus is going to look different depending on your needs, but at the end of the day, non-binary memory offers greater flexibility for balancing cost, capacity, and bandwidth.
"Technologies such as non-binary capacities are helpful, but so is the move to CXL memory — shared system memory — and on-chip high-bandwidth memory," Lam said.
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