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Cores Cache Content and Characterization IBMs Second Generation 14-nm Product z1
IBM z15系统在相同芯片面积和技术节点下，通过增加核心、缓存和优化设计，实现了性能提升。
5.2 GHz, 99.99999% uptime, 25% system capacity increase, 14% single thread performance improvement
IBM z15eDRAM电压降监控功耗优化高频性能
▸创新点1：新型2-Mb eDRAM单元（电路创新）- 采用优化的嵌入式动态随机存取存储器设计，显著提升存储密度和能效比，支持更高频率操作（5.2GHz）和更低功耗，同时保持99.99999%的可靠性。
▸创新点2：新的电压降监控器（系统创新）- 引入实时电压波动检测机制，通过动态调整供电电压来减少性能波动，提升系统稳定性，支持在5.2GHz高频下的持续运行。
▸创新点3：更全面的功耗降低基础设施（系统创新）- 集成多级功耗管理策略，包括动态频率调整和核心级功耗控制，降低整体功耗14%，同时减少因功耗限制导致的良率损失。
▸创新点4：高频特性探索（方法创新）- 通过实验室测试在客户环境温度与电压下首次实现6GHz运行，为未来产品高频优化提供数据支持。
Abstract
The IBM z15 system improves upon the prior-
generation z14 design within the same chip footprint and
technology node, while featuring the addition of two cores,
33%/100%/43% additional L2/L3/L4 cache, as well as additional
core features and on-chip accelerators. The largest 5-drawer
system configuration includes 20 central processor (CP) chips,
five system controller (SC) chips, and 40 TB of memory. With
∼200 cores across all CP chips operating with 99.99999% uptime
at 5.2 GHz, z15 achieves a 25%