AMD Ryzen Threadripper 2990WX 2nd Generation TR4 Socket Desktop Processor YD299XAZAFWOF ( 32 Cores, Up to 4.2GHz, 64MB Cache )

A bit of background is required to answer this question. For AMD Ryzen™ Threadripper™ X Series CPUs, every processor die has directly-connected memory. Local Mode and Distributed Mode change how the operating system sees these CPUs:

• In Local Mode, the OS sees two partitions called “NUMA nodes,” each with one die’s worth of CPU cores and RAM. Local Mode sends hints to the OS that threads and their memory contents should be kept within the same node (if possible) to minimize memory latency.
• In Distributed Mode, the OS sees a single large pool (“UMA node”) with all available dies and memory grouped together.

But, in a system where not every die has direct memory access, the system must necessarily be configured with four NUMA nodes: two with CPU cores plus local RAM, two with CPU cores and no local RAM. Threads will always fill the nodes with local memory first, but this is a first-come, first-served affair in Windows® that sometimes results in threads being executed remotely from their memory footprint. 

In such a system, some other mechanism is needed to preferentially execute threads on cores with local memory. Dynamic Local Mode is spiritually like Local Mode in that it also endeavors to keep threads and their memory contents together. However, unlike traditional Local Mode, Dynamic Local Mode:

• Operates on-the-fly without a reboot to toggle between modes
• Ensures that demanding threads are executed on dies with local memory
• Does not fundamentally change how the operating system sees the processor’s resources