With the 2nd gen Threadripper, there was much hand-wringing that the CPUs might not work with the existing X399 motherboards. Ever since the introduction of the AMD’s Ryzen CPUs in 2017, core counts of CPUs have taken off like an F-22 Raptor. Those two compute dies must talk through an I/O die that has PCIe and access to the memory. This design means an I/O die with memory access has 64ns of latency to memory, while a compute-only die has a latency of 105ns. On Threadripper, that essentially means that of the four dies in the 2990WX, two are pure compute-only dies, without direct access to memory and to PCIe. Although the sTR4 socket for Threadripper is physically the same as the server socket used for AMD’s Epyc CPUs, sTR4 is wired to support four-channel memory using two of the dies, rather than eight-channel memory using four dies. This method comes with its own special penalty, though. The 16-core Ryzen Threadripper 2950X features two active dies which each have their own memory and PCIe access. With the 32-core Ryzen Threadripper 2990WX AMD joins four 8-core chips together. The original 16-core Ryzen Threadripper 1950X joined two 8-core chips together. Rather than the single contiguous or monolithic die approach that Intel takes, AMD CPUs are multiple chips joined together by the company’s high-speed Infinity Fabric. What makes a 32-core Theadripper even possible is the multi-chip design. AMDĪMD has four new 2nd-generation Threadrippers on tap, but only one you can order today. If you’re wondering just how AMD went from an 8-core Ryzen 7 1800X to a 16-core Ryzen Threadripper 1950X to a 32-core Ryzen Threadripper 2990WX in the space of 16 months, while it took Intel three years just to go from a 6-core Core i7 to a 10-core Core i7, the magic is in the design. A Ryzen Threadripper 2990WX locked, cocked, and ready to crush multi-threaded benchmarks.
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