DEC Alpha 21264
E443300
The DEC Alpha 21264 is a high-performance 64-bit RISC microprocessor from Digital Equipment Corporation’s Alpha family, designed for advanced server and workstation applications in the late 1990s.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Alpha 21264 | 5 |
| DEC Alpha 21264 canonical | 2 |
| Alpha 21264 (EV6) family | 1 |
| DEC Alpha 21364 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4425622 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: DEC Alpha 21264 Context triple: [DEC Alpha servers, basedOnProcessorFamily, DEC Alpha 21264]
-
A.
DEC Alpha 21064
The DEC Alpha 21064 is a 64-bit RISC microprocessor from Digital Equipment Corporation’s Alpha family, notable as one of the first commercially available 64-bit CPUs and used in high-performance workstations and servers in the early 1990s.
-
B.
DEC Alpha 21164
The DEC Alpha 21164 is a 64-bit RISC microprocessor from Digital Equipment Corporation’s Alpha family, known for its high performance and use in advanced workstations and servers in the mid-1990s.
-
C.
Sun-4 workstation
The Sun-4 workstation is a line of SPARC-based UNIX workstations from Sun Microsystems that succeeded the Motorola 680x0-based Sun-3 series and became a widely used engineering and server platform in the late 1980s and early 1990s.
-
D.
AlphaServer 8400
AlphaServer 8400 is a high-end, 64-bit RISC-based enterprise server from Digital Equipment Corporation’s AlphaServer line, designed for demanding commercial and technical computing workloads.
-
E.
Itanium
Itanium is a 64-bit server processor architecture developed by Intel (with early collaboration from HP) that was designed for high-end enterprise and technical computing but ultimately saw limited adoption and was discontinued.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: DEC Alpha 21264 Target entity description: The DEC Alpha 21264 is a high-performance 64-bit RISC microprocessor from Digital Equipment Corporation’s Alpha family, designed for advanced server and workstation applications in the late 1990s.
-
A.
DEC Alpha 21064
The DEC Alpha 21064 is a 64-bit RISC microprocessor from Digital Equipment Corporation’s Alpha family, notable as one of the first commercially available 64-bit CPUs and used in high-performance workstations and servers in the early 1990s.
-
B.
DEC Alpha 21164
The DEC Alpha 21164 is a 64-bit RISC microprocessor from Digital Equipment Corporation’s Alpha family, known for its high performance and use in advanced workstations and servers in the mid-1990s.
-
C.
Sun-4 workstation
The Sun-4 workstation is a line of SPARC-based UNIX workstations from Sun Microsystems that succeeded the Motorola 680x0-based Sun-3 series and became a widely used engineering and server platform in the late 1980s and early 1990s.
-
D.
AlphaServer 8400
AlphaServer 8400 is a high-end, 64-bit RISC-based enterprise server from Digital Equipment Corporation’s AlphaServer line, designed for demanding commercial and technical computing workloads.
-
E.
Itanium
Itanium is a 64-bit server processor architecture developed by Intel (with early collaboration from HP) that was designed for high-end enterprise and technical computing but ultimately saw limited adoption and was discontinued.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
64-bit RISC microprocessor
ⓘ
Alpha processor ⓘ microprocessor ⓘ |
| addressSpace | 64-bit virtual address space ⓘ |
| alsoKnownAs |
Alpha 21264
ⓘ
linked to:
DEC Alpha 21264
EV6 ⓘ |
| architecture | RISC ⓘ |
| branchPrediction | advanced branch prediction ⓘ |
| clockFrequency |
500 MHz (initial versions)
ⓘ
up to around 750 MHz (later versions) ⓘ |
| company | Digital Equipment Corporation ⓘ |
| companyAcquisitionContext |
Digital Equipment Corporation later acquired by Compaq
ⓘ
linked to:
Digital Equipment Corporation
|
| designedFor |
servers
ⓘ
workstations ⓘ |
| designGoal | maximize single-thread performance ⓘ |
| endianSupport | little-endian ⓘ |
| executionType | out-of-order execution ⓘ |
| family |
DEC Alpha family
ⓘ
linked to:
DEC Alpha
|
| floatingPointStandard | IEEE 754 compatible ⓘ |
| floatingPointUnit | integrated FPU ⓘ |
| floatingPointUnits | multiple floating-point execution units ⓘ |
| integerUnits | multiple integer execution units ⓘ |
| introductionYear | 1998 ⓘ |
| ISA | DEC Alpha ⓘ |
| issueWidth | 4-way superscalar ⓘ |
| L1Cache |
64 KB data cache
ⓘ
64 KB instruction cache ⓘ |
| L2CacheSupport | external L2 cache ⓘ |
| manufacturer | Digital Equipment Corporation ⓘ |
| notableFeature |
aggressive out-of-order execution core
ⓘ
high instruction-level parallelism ⓘ large on-chip L1 caches for its time ⓘ |
| pipelineType | superscalar ⓘ |
| powerSupplyInterface | external L2 cache interface ⓘ |
| predecessor | DEC Alpha 21164 ⓘ |
| processTechnology | 0.35 µm CMOS (initial) ⓘ |
| registerFile |
32 floating-point registers
ⓘ
32 integer registers ⓘ |
| successor |
DEC Alpha 21364
ⓘ
linked to:
Alpha 21364
|
| targetMarket |
enterprise servers
ⓘ
high-performance computing ⓘ technical workstations ⓘ |
| usedIn |
Digital AlphaServer systems
ⓘ
linked to:
DEC Alpha servers
Digital/Compaq AlphaStation workstations ⓘ |
| wordSize | 64-bit ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: DEC Alpha 21264 Description of subject: The DEC Alpha 21264 is a high-performance 64-bit RISC microprocessor from Digital Equipment Corporation’s Alpha family, designed for advanced server and workstation applications in the late 1990s.
Referenced by (9)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: DEC Alpha 21264
linked to: DEC Alpha 21264
linked to: DEC Alpha 21264
linked to: DEC Alpha 21264
linked to: DEC Alpha 21264
linked to: DEC Alpha 21264
linked to: DEC Alpha 21264