AMD OS4122WLU4DGNS Quad-Core Server Processor

Overview

The AMD OS4122WLU4DGNS is an Opteron 4100-series quad-core server processor running at 2.20 GHz, built for Socket C32 platforms that need a straightforward compute refresh or a drop-in replacement for an aging node. It pairs a 45nm process with a 75W thermal design power envelope, which puts it in the efficient-node category for organizations padding out low-power server racks or refreshing a homelab-to-production server build without a full platform swap. This part number turns up frequently as a replacement CPU for maintaining existing Socket C32 deployments where sourcing a matching-generation chip beats a full motherboard upgrade.

Key Features

• Quad-Core (4 Core) Design: Four physical cores handle parallel workloads — batch jobs, virtualization hosts running several lightweight guests, or multi-threaded application servers — without the socket-count overhead of a dual-CPU build.
• 2.20 GHz Clock Speed: A steady clock for sustained throughput workloads rather than burst-latency-sensitive tasks; matches well with workloads that value core count and cache over peak single-thread speed.
• 6 MB L3 Cache: A shared last-level cache this size reduces main-memory round trips on multi-core workloads, which matters most when several cores are contending for the same working set — think database connection pools or virtualized guests sharing data.
• 2 MB L2 Cache: Backs up the smaller L1 tier with a mid-level cache that keeps frequently reused instructions and data close to the cores, smoothing out performance on branch-heavy application code.
• 512 KB L1 Cache: The fastest cache tier on the chip — keeps hot instruction and data paths as close to the execution units as physically possible.
• 64-bit Processing: Full 64-bit addressing, required for any modern 64-bit server OS and for allocating memory beyond the 4GB ceiling of 32-bit platforms.
• 45nm Process Technology: A smaller process node than earlier Opteron generations, translating into better performance-per-watt — part of why this chip lands at a 75W TDP instead of the 90W+ figures common on older-generation parts.
• Socket C32 OLGA-1207: Physically and electrically matched to Socket C32 motherboards — confirm your board's socket revision before ordering, since this part will not fit AM3, G34, or later server sockets.
• 75W Thermal Design Power: A moderate TDP that keeps cooling requirements and per-node power draw down, relevant when you're calculating rack-level power and cooling budgets across multiple nodes.
• 1.3V DC Input Voltage: Standard core voltage for this Opteron generation — confirm your motherboard's VRM supports this voltage range before installing.
• 158°F (70°C) Thermal Specification: The maximum case temperature the chip is rated to run at — a useful ceiling to check against your chassis airflow and heatsink mounting pressure during commissioning.

Integration & Compatibility

This processor is built specifically for Socket C32 OLGA-1207 motherboards — the socket family AMD used across several Opteron 4000-series generations. It is not interchangeable with Socket G34 boards, which use a different pin layout for higher-core-count Opteron parts. Before you order, verify your board's BIOS has a compatibility entry for the 4122, since server board vendors gate CPU support by BIOS revision. If you're building out a full node rather than replacing a single CPU, pair this with compatible ECC memory and review your power and UPS equipment sizing against the 75W TDP across however many sockets your chassis supports. For teams managing a mixed fleet of server processors across generations, keeping a documented map of which socket type serves which rack is worth the spreadsheet — it's the single most common ordering mistake on replacement CPU purchases.

Frequently Asked Questions

Q: What socket does the AMD OS4122WLU4DGNS use?

A: Socket C32 OLGA-1207. It is not compatible with Socket G34, AM3, or newer server sockets — confirm your motherboard's socket type before ordering.

Q: How many cores does the OS4122WLU4DGNS have?

A: It's a quad-core (4 core) processor running at 2.20 GHz.

Q: What's the TDP on this processor?

A: 75W thermal design power, with a maximum case temperature rating of 158°F (70°C).

Q: How much cache does the OS4122WLU4DGNS have?

A: 512 KB L1, 2 MB L2, and 6 MB L3 cache.

Q: Is the OS4122WLU4DGNS a 64-bit processor?

A: Yes, it supports full 64-bit processing.

Q: What input voltage does this CPU require?

A: 1.3V DC.

Karl Wilson

The OS4122WLU4DGNS is a quiet workhorse — 2.20 GHz across four cores with a 6MB L3 cache is a solid balance for Socket C32 nodes handling multiple lightweight VM guests rather than a single latency-critical application.

Technical Highlights:

• 6MB L3 / 2MB L2 / 512KB L1 cache hierarchy: the 6MB shared L3 is the number that matters most here — it cuts down memory round trips when four cores are all pulling from overlapping working sets, which is exactly the pattern you see on consolidated virtualization hosts.
• 75W TDP on a 45nm process: lower thermal output than earlier Opteron generations at similar clock speeds, which keeps per-node cooling and power budgets predictable when you're racking multiple units.
• 1.3V DC / 158°F (70°C) thermal ceiling: tight enough tolerances that airflow and heatsink seating matter — verify your chassis fan curve against this ceiling before you commission the node, not after.

Deployment Considerations:

• This is a Socket C32 OLGA-1207 part specifically — it will not physically seat in a Socket G34 board, so cross-check your motherboard's socket spec before ordering a replacement CPU.
• Server boards gate supported CPUs by BIOS revision on this platform generation — confirm your board's BIOS changelog lists the 4122 before you commit budget to a bulk order.

This part makes the most sense as a like-for-like replacement CPU for existing Socket C32 Opteron 4100-series deployments — extending the service life of a rack that's already running this platform generation rather than as a foundation for a new build.