The AMD Ryzen 9 3900X is the objective winner of this comparison, securing victory in ten out of fourteen measured specifications. Its most significant advantage over the AMD Ryzen 7 1700 is its L3 cache, which is 300% larger. While the AMD Ryzen 7 1700 holds a 54% advantage in max turbo power, the superior cache capacity and broader spec lead make the AMD Ryzen 9 3900X the more capable component across the majority of technical categories.

Users prioritizing high-capacity cache for complex processing tasks should select the AMD Ryzen 9 3900X to leverage its substantial architectural advantage. Conversely, the AMD Ryzen 7 1700 remains a viable alternative for those specifically seeking the benefits of its higher max turbo power. Choosing between these processors depends on whether your workload relies more heavily on the expanded cache of the newer model or the specific power profile offered by the older unit.