The 24-Core POWER9 Processor With Adaptive Clocking, 25-Gb/s Accelerator Links, and 16-Gb/s PCIe Gen4
Abstract: The POWER9TM family of chips is fabricated in 14-nm silicon-on-insulator finFET technology using 17 levels of copper interconnect. The 695-mm2 24-core microprocessor features a new core based on an execution slice microarchitecture. The chip contains 8 billion transistors and has 120 MB of eDRAM L3 cache. The processor features an adaptive clock strategy to reduce timing margin needed during power supply droop events by embedding analog voltage-droop monitors that direct a digital phase-locked loop to immediately reduce clock frequency in response to a droop event. The scale-out chip IO subsystem supports up to 300-GB/s accelerator bandwidth using new 25-Gb/s links, 48 lanes of PCIeGen4 totaling 192 GB/s, eight ports of 2667 MT/s DDR4, and 256 GB/s of symmetric multiprocessor (SMP) interconnect. The scale-up chip adds additional SMP bandwidth and replaces the DDR4 memory interface with eight ports of differential memory interfaces with 230 GB/s of bandwidth resulting in 12.9 Tb/s of total off-chip bandwidth.
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