Editing DEC Alpha (section)

===Model history===
{| class="wikitable sortable" style="font-size:97%; text-align:center;"
! Model
! Model number
! Year
! Frequency [MHz]
! Process [μm]
! Transistors [millions]
! Die size [mm<sup>2</sup>]
! IO pins
! Power [W]
! Voltage
! Dcache [KB]<ref group=lower-alpha>In the context of cache memory, 1 KB = 1024 [[byte]]s; 1 MB = 1024 KB</ref>
! Icache [KB]
! Scache
! Bcache
! [[#ISA|ISA]]
|-
!EV4
|[[Alpha 21064|21064]]||1992||100&ndash;200||0.75||1.68||234||290||30||3.3||8||8||–||128&nbsp;KB&ndash;16&nbsp;MB||&nbsp;
|-
!EV4S
|21064||1993||100&ndash;200||0.675||1.68||186||290||27||3.3||8||8||–||128&nbsp;KB&ndash;16&nbsp;MB||&nbsp;
|-
!EV45
|21064A||1994||200&ndash;300||0.5||2.85||164||||33||3.3||16||16||–||256&nbsp;KB&ndash;16&nbsp;MB||&nbsp;
|-
!LCA4
|21066||1993||100&ndash;166||0.675||1.75||209||||21||3.3||8||8||–||&nbsp;||&nbsp;
|-
!LCA4
|21068||1994||66||0.675||1.75||209||||9||3.3||8||8||–||&nbsp;||&nbsp;
|-
!LCA45
|21066A||1994||100&ndash;266||0.5||1.8||161||||23||3.3||8||8||–||&nbsp;||&nbsp;
|-
!LCA45
|21068A||1994||100||0.5||1.8||161||||||3.3||8||8||–||&nbsp;||&nbsp;
|-
!EV5
|[[Alpha 21164|21164]]||1995||266&ndash;500||0.5||9.3||299||296||56||3.3/2.5||8||8||96&nbsp;KB||Up to 64&nbsp;MB||R
|-
!EV56
|21164A||1996||366&ndash;666<ref name="facts and comments"/>||0.35||9.66<ref name="facts and comments"/>||209||||31&ndash;55<ref name="facts and comments"/>||3.3/2.5<ref name="facts and comments"/>||8||8||96&nbsp;KB||Up to 64&nbsp;MB||R,B
|-
!PCA56
|21164PC||1997||400&ndash;533||0.35||3.5||141||264||26&ndash;35||3.3/2.5||8||16||–||512&nbsp;KB&ndash;4&nbsp;MB||R,B,M
|-
!PCA57
|21164PC||&nbsp;||600&ndash;666||0.28||5.7||101||283||18&ndash;23||2.5/2.0||16||32<ref name="facts and comments">{{cite web
 |url = http://www.alasir.com/articles/alpha_history/
 |title = Alpha: The History in Facts and Comments
 |access-date = Nov 22, 2008
 |author = Paul V. Bolotoff
 |date = 21 April 2007
 |archive-url = https://web.archive.org/web/20131203130550/http://alasir.com/articles/alpha_history/
 |archive-date = 3 December 2013
 |url-status = dead
}}</ref>
||–||512&nbsp;KB&ndash;4&nbsp;MB||R,B,M
|-
!EV6
|[[Alpha 21264|21264]]||1998||450&ndash;600||0.35||15.2||314||389||73||2.0||64||64||–||2&ndash;8&nbsp;MB||R,B,M,F
|-
!EV67
|21264A||1999||600&ndash;750||0.25||15.2||210||389||&nbsp;||2.0||64||64||–||2&ndash;8&nbsp;MB||R,B,M,F,C
|-
!EV68AL
|21264B||2001||800&ndash;833||0.18||15.2||125||&nbsp;||&nbsp;||1.7||64||64||–||2&ndash;8&nbsp;MB||R,B,M,F,C,T
|-
!EV68CB
|21264C||2001||1000&ndash;1250||0.18||15.2||125||&nbsp;||65&ndash;75||1.65||64||64||–||2&ndash;8&nbsp;MB||R,B,M,F,C,T
|-
!EV68CX
|21264D||&nbsp;||&nbsp;||&nbsp;||&nbsp;||&nbsp;||&nbsp;||&nbsp;||1.65||64||64||–||2&ndash;8&nbsp;MB||R,B,M,F,C,T
|-
!EV7
|[[Alpha 21364|21364]]||2003||1000&ndash;1150||0.18||130||397||||125||1.5||64||64||1.75&nbsp;MB||–||R,B,M,F,C,T
|-
!EV7z
|21364||2004||1300||0.18||130||397||||125||1.5||64||64||1.75&nbsp;MB||–||R,B,M,F,C,T
|-
!colspan=16| Cancelled
|-
!EV78/EV79
|21364A||Slated for 2004||1700||0.13||152||300||||120||1.2||64||64||1.75&nbsp;MB||–||R,B,M,F,C,T
|-
!EV8
|[[Alpha 21464|21464]]||Slated for 2003||1200&ndash;2000||0.125||250||420||1800||??||1.2||64||64||3&nbsp;MB||–||R,B,M,F,C,T
|}

;ISA extensions:

* '''R''' – Hardware support for rounding to infinity and negative infinity.<ref>{{cite web
| url = http://www.mostang.com/~davidm/papers/expo97/paper/doc003.html
| title = Overview of Alpha Family
| access-date = Dec 9, 2009
| author = David Mosberger
| archive-date = January 20, 2009
| archive-url = https://web.archive.org/web/20090120232139/http://mostang.com/~davidm/papers/expo97/paper/doc003.html
| url-status = live
}}</ref>
* '''B''' – BWX, the "Byte/Word Extension", adding instructions to allow 8- and 16-bit operations from memory and I/O
* '''M''' – MVI, "multimedia" instructions
* '''F''' – FIX, instructions to move data between integer and floating-point registers and for square root
* '''C''' – CIX, instructions for counting and finding bits
* '''T''' – support for prefetch with modify intent to improve the performance of the first attempt to acquire a lock