AMD, which announced its Ryzen Threadripper HEDT processor at its 2017 Computex show, closely followed by certain motherboard manufacturers' unveiling of their compatible AMD X399 chipset motherboards; is readying nine SKUs based on the dual "Summit Ridge" MCM. This includes 10-core (3+2+3+2), 12-core (3+3+3+3), 14-core (4+3+4+3), and 16-core (4+4+4+4) models, all of which have SMT enabled, resulting in 20, 24, 28, and 32 threads, respectively; full 64-lane PCI-Express gen 3.0 root-complexes; and full quad-channel DDR4 memory interfaces. Some of these models with the "X" brand extension feature XFR (extended frequency range), which adds 200 MHz to the boost clock, if the cooling is sufficient.
The lineup is led by the 16-core/32-thread Ryzen Threadripper 1998X, with a healthy clock speed of 3.50 GHz, and 3.90 GHz boost, a TDP of 155W, and XFR. This is closely followed by the 16-core/32-thread 1998, clocked lower, at 3.20 GHz with 3.60 GHz boost, 155W TDP, and lack of XFR. The 16-core chips are followed by 14-core models. The 14-core/28-thread Ryzen Threadripper 1977X ships with 3.50 GHz core clock speed, but 4.00 GHz boost, XFR, and the same 155W TDP as the 16-core parts. This is closely followed by the 14-core/28-thread 1977 (non-X), with lower clocks of 3.20 GHz core, 3.70 GHz boost, and again, the same 155W TDP.