ALLEN BRADLEY SLC 5/05 1747-L551 1-core
Built for industrial control, this single-core processor provides deterministic execution for legacy SLC 500 automation systems. Its SER A revision ensures compatibility with established rack-based I/O configurations, with a 5/5 customer rating reflecting reliability in sustained operation. This unit is best for maintenance engineers needing a direct replacement to keep aging manufacturing lines or process control systems running.
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Overzicht
The 30-Second Version
The Allen Bradley SLC 5/05 1747-L551 is an industrial PLC processor with single-thread performance in the 3rd percentile and multi-thread in the 4th. It's not a consumer CPU, and it's priced at $1,879 USD for legacy industrial use. Buy it only if you're maintaining a SLC 500 system, not for gaming or productivity.
Pros & Cons
Pluspunten
- Legendary reliability in industrial settings
- Still supported by a huge installed base of SLC 500 systems
- Simple, deterministic single-core operation
- 5/5 customer rating from the one listing we found
- Ethernet port built in, rare for its era
Minpunten
- Single-thread performance in the 3rd percentile
- Multi-thread performance in the 4th percentile
- Efficiency in the 4th percentile, it's a power hog by modern standards
- Feature set in the 21st percentile, barebones even for industrial gear
- Listed at $1,879 USD, which is absurd for what you get
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Performance
If you're expecting this to compete with an AMD Ryzen 7 9800X3D, you're going to have a bad time. The 1747-L551 is a single-core processor designed for deterministic industrial control, not gaming or productivity. Our database puts its single-thread score in the 3rd percentile, which means it's one of the worst we've seen for that metric. Multi-thread is barely better at the 4th percentile. But here's the thing: this processor isn't about raw speed. It's about reliability, uptime, and running ladder logic without hiccups for years. For that job, it's a legend. For anything else, it's a museum piece with a power cord.
Specifications
Full Specifications
Processor
| Class | desktop |
Cores & Clocks
| Cores | 1 |
vs Competition
Stacked against the AMD Ryzen 7 9800X3D or Intel Core Ultra 9 285K, the 1747-L551 looks like it's from another planet, because it is. Those chips are in the top percentiles for single-thread, multi-thread, and efficiency, while this Allen Bradley unit is scraping the bottom. Even the HP Xeon 6526Y, which is also enterprise hardware, runs circles around it in raw compute. The only fair comparison is against other legacy PLC processors, and in that niche, the SLC 5/05 holds its own as a reliable workhorse. But in our general CPU database, it's dead last in almost every performance metric.
| Spec | ALLEN BRADLEY SLC 5/05 1747-L551 | AMD Ryzen 7 9800X3D | Intel Core Ultra 9 285K | SMC EPYC 9555P | HP Xeon 6526Y | CG CHIPS GATE EPYC 6GK7443-1EX30-0XE0 1PC New 6GK7443-1EX30-0XE0 Communications Processor |
|---|---|---|---|---|---|---|
| Cores | 1 | 8 | 24 | 64 | 16 | 24 |
| Threads | - | 16 | 24 | 128 | 32 | 48 |
| Boost Clock Mhz | - | 5200 | 5700 | 4400 | 3900 | 4000 |
| L3 Cache Mb | - | 96 | 36 | 256 | 37 | 128 |
| Tdp W | - | 120 | 125 | 360 | 195 | 200 |
| Socket | - | AM5 | LGA 1851 | AMD Socket SP5 | LGA 4677 | AMD Socket SP3 |
| Integrated Graphics | - | AMD Radeon | Intel Graphics | - | No | - |
| Compare | Compare | Compare | Compare | Compare |
| Product | AI | Feature | Platform | Efficiency | Multi Thread | Gebruikersoordeel | Affordability | Single Thread |
|---|---|---|---|---|---|---|---|---|
| ALLEN BRADLEY SLC 5/05 1747-L551 | 3.2 | 20.7 | 17.4 | 3.5 | 3.5 | 36.3 | 2.9 | 3 |
| AMD Ryzen 7 9800X3D Compare | 91.7 | 98.5 | 95.2 | 88.9 | 89.2 | 99.5 | 23.7 | 95.1 |
| Intel Core Ultra 9 285K Compare | 96.2 | 99.9 | 96 | 97.2 | 96.4 | 90.3 | 18.3 | 99.9 |
| SMC EPYC 9555P Compare | 99.3 | 77.5 | 96.8 | 89.7 | 99.4 | 0 | 0.4 | 85.9 |
| HP Xeon 6526Y Compare | 92.1 | 77.5 | 90.7 | 79.3 | 90 | 0 | 2.7 | 80.6 |
| CG CHIPS GATE EPYC 6GK7443-1EX30-0XE0 1PC New 6GK7443-1EX30-0XE0 Communications Processor Compare | 94.8 | 77.5 | 84.4 | 85.2 | 93.9 | 36.3 | 5.3 | 80.5 |
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Value & Pricing
The value story here is complicated. At $1,879 USD from a single Amazon listing, you're paying a premium for legacy industrial hardware that's been out of production for years. The affordability score sits in the 3rd percentile, which means almost everything else in our database gives you more performance per dollar. But if you're maintaining an existing SLC 500 system and need a drop-in replacement, the price is what it is. You're not buying a processor, you're buying uptime insurance for a factory floor.
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Overview
Let's get this out of the way first: the Allen Bradley SLC 5/05 1747-L551 is not a consumer CPU. It's an industrial PLC processor from the SLC 500 series, and it's sitting in our database next to Ryzens and Core Ultras because someone listed it on Amazon under CPU Processors. That said, the numbers are what they are, and they're rough. Single-thread performance lands in the 3rd percentile, multi-thread in the 4th, and efficiency in the 4th. This thing wasn't built to run benchmarks, it was built to keep assembly lines running for decades without complaint.
Common Questions
Q: Can I use this as a regular desktop CPU?
No. The 1747-L551 is a PLC processor for industrial automation. It doesn't fit a standard motherboard socket, doesn't run Windows or Linux, and its single-thread performance is in the 3rd percentile of our database. It's designed to execute ladder logic for controlling machinery, not to boot an operating system.
Q: Why is this so expensive at $1,879 USD?
Legacy industrial hardware carries a premium because factories need exact replacements to keep systems running. The SLC 500 series is discontinued, so remaining stock is scarce. You're paying for compatibility and reliability, not performance. Our affordability score puts it in the 3rd percentile, meaning almost everything else gives more compute per dollar.
Q: Is the SLC 5/05 still supported?
Allen Bradley no longer actively sells the SLC 500 series, but the installed base is massive, and third-party support is widespread. The 1747-L551 has a built-in Ethernet port, which was a big deal when it launched and still makes it easier to integrate with modern networks compared to older serial-only models.
Who Should Skip This
Skip this if you're building a PC, upgrading a workstation, or doing anything that involves gaming, AI, or content creation. The AI score is 2 out of 100, single-thread is in the 3rd percentile, and efficiency is in the 4th. Even for industrial use, if you're starting a new project, look at modern PLCs from Allen Bradley's CompactLogix or ControlLogix lines instead of investing in a discontinued platform.
Verdict
If you're shopping for a gaming rig or a workstation, close this tab. The 1747-L551 is not for you. But if you're an industrial automation engineer looking for a replacement SLC 5/05 processor, you already know what this is and why it costs what it costs. The 5/5 customer rating suggests the one person who bought this on Amazon got exactly what they needed. For everyone else, this is a curiosity, a reminder that not all CPUs are created equal, and some are created to run conveyor belts.
