The z990 contained up to 48 cores, of which up to 32 were enabled as Central Processors. To support this increase, the z990 was the first IBM mainframe with a non-uniform memory access, as its processors and memory were grouped into up to four "book"-modules, each book also containing a 32 MB L2 cache. [43]

IBM宣称，z990在z900的基础上加强了电子商务能力，它是专门为提高对客户的实时要求而设计的。z990不仅在处理速度上有了显著的提供，而且和z900相比，它有高出z900四倍的内存和二倍的I/O同道。

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z/OS MVS Product Management. Previous topic | Next topic | Contents | Contact z/OS | Library | PDF IBM z990 servers z/OS MVS Product Management SA23-1391-00

With a new superscalar microproces-sor and the CMOS9S-SOI technology, the z990 is designed to further extend and integrate key platform character-istics such as dynamic fl exible par-titioning and resource management in mixed and unpredictable workload environments, providing scalability, high availability and Quality of Ser-vice to emerging e-b...

The IBM eServer™ z990 microprocessor implements many features designed to give excellent performance on both newer and traditional mainframe applications. These features include a new superscalar instruction execution pipeline, high-bandwidth caches, a huge secondary translation-lookaside buffer (TLB), and an onboard cryptographic coprocessor.

2004年5月23日 · The IBM Eserver zSeries® 990 scalable server provides major extensions to the existing zSeries architecture and capabilities. The concept of Logical Channel Subsystems is added, and the maximum number of Processor Units and logical partitions is ...

This IBM Redbook is intended for IBM systems engineers, consultants, and customers who need to understand the zSeries 990 features, functions, availability, and services. This publication is part of a series.

2003年5月19日 · z990是40年来IBM最强大和可扩展性最好的大型机，其虚拟容量是z900的两倍，处理能力将近z900的三倍；新的“组建模块”设计允许客户在不使系统停机 ...

View and Download IBM 990 reference manual online. zSeries and z/OS. 990 server pdf manual download. Also for: Z/os, Z990.