Editing POWER5 (section)

{{Short description|2004 family of multiprocessors by IBM}}
{{Infobox CPU
| name                      = POWER5
| image                     = POWER5-MCM.jpg
| caption                   = POWER5 MCM
| produced-start            = 2004
| produced-end              =
| slowest                   = 1.5 | slow-unit                 = GHz
| fastest                   = 2.3 | fast-unit                 = GHz
| size-from                 = 130 nm
| size-to                   = 90 nm
| designfirm  = IBM
| brand1      =
| arch        = PowerPC 2.02
| microarch   =
| numcores    = 2
| l1cache     = 32+32 KB/core
| l2cache     = 1.875 MB/chip
| l3cache     = 36 MB/chip (off-chip)
| predecessor = [[POWER4]]
| successor   = [[POWER6]]
| application =
}}
{{POWER, PowerPC, and Power ISA}}
[[Image:Power5.jpg|thumb|right|280px|A MCM containing four POWER5 dies and four 36 MB L3 cache dies. Measuring 3.75in x 3.75in]]
[[Image:Power5+.jpg|thumb|right|280px|Processor module from an IBM i5 system, containing a POWER5+ DCM]]
[[File:Power5 CPU 2-way damaged.jpg|thumb|2 way POWER5 CPU, heat-sink removed (damaged CPU die)]]
[[File:Power5 MCM 8 way top.jpg|thumb|IBM POWER5+ 8-way  MCM CPUs and cache chips.]]
[[File:Power5 MCM 8 way bottom.jpg|thumb|IBM POWER5+ 8-way MCM Interface.]]
[[File:Power5 MCM 8 way side.jpg|thumb|IBM POWER5+ 8-way MCM side view.]]
The '''POWER5''' is a [[microprocessor]] developed and fabricated by [[IBM]]. It is an improved version of the [[POWER4]]. The principal improvements are support for [[simultaneous multithreading]] (SMT) and an on-die [[memory controller]]. The POWER5 is a [[dual-core]] microprocessor, with each core supporting one physical [[Thread (computing)|thread]] and two logical threads, for a total of two physical threads and four logical threads.