AMD OS4280WLU8KGUS Socket C32 8-Core Server CPU

Overview

The AMD OS4280WLU8KGUS is an Opteron 4280 server processor built for Socket C32 (LGA1207) platforms — an eight-core, 2.8GHz part aimed at rack and tower servers where you need consistent multi-threaded throughput without moving up to a dual-socket G34 platform. This part number covers the OS4280WLU8KGU / OS4280WLU8KGUS / OS4280WLU8KGUWOF variants, which share identical specification and function. If you're refreshing an aging Opteron 4000-series server, sourcing a spare for a maintenance pool, or standardizing a fleet of C32 boards on a known-good CPU, the 4280 fills the mid-tier slot in the 4200 family between the lower-clocked 4274 HE and the higher-clocked 4284.

Key Features

• Eight physical cores at 2.8GHz: gives you real parallel throughput for virtualized workloads or multi-threaded server applications rather than relying on turbo bursts from fewer cores — useful when a hypervisor or database engine is scheduling many concurrent threads across a single socket.
• 8MB cache: a shared cache pool this size reduces main-memory round trips on data sets that don't fit entirely in per-core L1/L2, which matters for database and file-serving workloads where cache misses are the real bottleneck.
• Socket C32 / LGA1207 compatibility: this is the single-socket Opteron 4000-series platform, distinct from the G34 socket used by the 6000-series — confirm your motherboard is C32 before ordering, since the two sockets are not interchangeable despite similar pin counts.
• Server-class design: built as a Computer Type: Server component rather than a desktop part, meaning it's intended for the sustained duty cycles and ECC memory support typical of rack-mounted or tower server chassis.
• 501g weight: consistent with a boxed server CPU including integrated heat spreader — relevant mainly for shipping calculations and confirming you received the actual processor rather than a lighter counterfeit or engineering sample.
• Explicit part number set (OS4280WLU8KGU / OS4280WLU8KGUS / OS4280WLU8KGUWOF): AMD issues the same silicon under multiple suffix variants tied to packaging and revision — useful to know so you don't second-guess a part number that doesn't exactly match a listing photo.

Integration & Compatibility

Before ordering the OS4280WLU8KGUS, verify your board is populated for Socket C32 (LGA1207) — it will not physically fit a Socket F or G34 board despite superficial similarity in the server CPU lineup. This part slots into existing Opteron 4200-series deployments as a drop-in replacement or upgrade path from lower-binned parts like the 4274 HE, without requiring a chipset change. For teams planning a broader server refresh rather than a single-socket swap, it's worth reviewing current server hardware and network switches to confirm the rest of the rack can support the workload you're consolidating onto this CPU, and consulting a infrastructure planning guide when scoping a larger deployment. If you manage a mixed fleet of AMD server parts, the broader AMD product line is worth checking for compatible companion CPUs when populating multiple systems, and pairing this refresh with an NVR upgrade makes sense if the server in question is feeding a video management workload rather than general compute.

What's in the Box

1x AMD Opteron 4280 server processor (OS4280WLU8KGUS).

Frequently Asked Questions

Q: What socket does the OS4280WLU8KGUS use?

A: Socket C32 (LGA1207). It does not fit Socket F boards.

Q: What's the clock speed and core count on the OS4280WLU8KGUS?

A: 2.8GHz across eight cores, with 8MB of cache.

Q: Are OS4280WLU8KGU and OS4280WLU8KGUS the same processor?

A: Yes — these part number suffixes, along with OS4280WLU8KGUWOF, refer to the same Opteron 4280 specification and function.

Q: What's the difference between the Opteron 4280 and the 4284?

A: Both are Socket C32 eight-core parts in the same family; the 4284 is a higher-clocked variant, so choose based on the throughput your workload needs.

Q: Is this a desktop or server CPU?

A: It's classified as a server CPU, intended for rack or tower server platforms rather than desktop boards.

Marty Allison

The OS4280WLU8KGUS lands in a spot I see a lot of maintenance-pool orders for: eight cores at 2.8GHz on Socket C32, which is exactly what you need when you're keeping an existing Opteron 4200-series rack server alive instead of doing a full platform swap.

Technical Highlights:

• 8-core / 2.8GHz: gives consistent per-thread performance across all eight cores rather than a boosted 2-4 core profile, which matters for VM hosts running many small guests.
• 8MB cache: keeps working sets closer to the core on database and file-serving loads, cutting down on memory-latency stalls versus a smaller-cache part.
• Socket C32/LGA1207: confirms this is the single-socket 4000-series platform — don't try to drop it into a G34 board expecting it to work, the pinout won't allow it.

Deployment Considerations:

• Cross-check your motherboard's supported CPU list before ordering — C32 boards from this era have a defined qualified list and not every 4200-series part is guaranteed compatible with every BIOS revision.
• Multiple part suffixes (OS4280WLU8KGU, OS4280WLU8KGUS, OS4280WLU8KGUWOF) map to the same silicon, so don't assume a mismatched suffix on a pulled part means wrong CPU — check clock speed and core count first.

Good fit for shops maintaining legacy single-socket AMD Opteron 4200-series servers past their original support window, where replacing the whole chassis isn't in the budget but a dead or underperforming CPU needs a like-for-like swap.