IBM z15 (microprocessor)

The z15 is a microprocessor made by IBM for their IBM Z mainframe computers, announced on September 12, 2019.[2]

z15
General Info
Launched2019
Designed byIBM
Performance
Max. CPU clock rate5.2[1] GHz
Cache
L1 cache128 KB I-L1
128 KB D-L1
per core
L2 cache4 MB I-L2
4 MB D-L2
per core
L3 cache256 MB
shared
Architecture and classification
Min. feature size14 nm[1]
Instruction setz/Architecture
Physical specifications
Cores
History
Predecessorz14

Description

The Processor Unit chip (PU chip) has 12 cores. The z15 cores support two-way simultaneous multithreading.[3]

The cores implement the CISC z/Architecture with a superscalar, out-of-order pipeline. New in z15 is an on-chip Nest Accelerator Unit, shared by all cores, to accelerate compression.[3]

The cache (e.g. level 3) is doubled from the previous generation z14, while the "L4 Cache increased from 672MB to 960MB, or +43%" with the new add-on chip System Controller (SC) SCM. Both it and all levels of cache in the main processor from level 1 use eDRAM, instead of the traditionally used SRAM. "A five-CPC drawer system has 4800 MB (5 x 960 MB) of shared L4 cache."

gollark: Also, can we get ABR in here?
gollark: Anyway, Nim is quite cool. It is like Python but compiled and more strongly typed, plus macrons.
gollark: Is this related to whatever bizarre encoding scheme they use?
gollark: My device is still warrantied but not having a laptop for ages while it gets repaired would be very inconvenient, so does anyone know how long this sort of thing generally takes to get fixed (or if there is a simple repair I can do, but I doubt it)?
gollark: I heard a "pop" noise earlier today when using my laptop (Legion 5, 2020, RTX 2060, i5-10300H), and it seems that now heavy GPU load causes a weird periodic buzzing noise (attached; sorry for the poor quality but I had to boost the volume lots for it to be audible, and also the recording is mostly fan noise). I figure it's a GPU power supply issue.

See also

References
  1. "IBM z15 (z15)". IBM.
  2. "IBM Unveils z15 With Industry-First Data Privacy Capabilities" (Press release). IBM. September 12, 2019.
  3. IBM z15 (8561) Technical Guide (PDF). September 2019. SG24-8851-00. Retrieved September 14, 2019.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.