CPU Comparison

The AMD Opteron 4280 and AMD Opteron 3280 are both eight-core server-class processors from AMD’s end-of-life lineup, but they are built on different architectures and target different segments. The data shows a clear performance hierarchy: the Opteron 4280 wins every benchmark in the head-to-head comparison, with margins ranging from 18.8% to 19.2%. However, the Opteron 3280 offers a significantly lower TDP and a different platform fit, which can matter for specific use cases. This analysis breaks down where each chip makes sense based purely on the benchmark and specification data.

Where Each One Wins

The AMD Opteron 4280 is the outright performance winner in every measured workload. It takes all five head-to-head benchmark wins, with the largest advantage appearing in Cinebench R23 single-core, where it scores 540 versus 453 for the Opteron 3280, a 19.2% lead. The multi-core results follow the same pattern: 3828 versus 3215 in Cinebench R23 multi-core, and 385 versus 324 in Cinebench R15 multi-core. If the workload is compute-heavy and the system can tolerate higher power draw, the Opteron 4280 is the only choice between these two.

The AMD Opteron 3280 does not win any benchmark, but it wins on platform efficiency. Its TDP is 65 watts, compared to 95 watts for the Opteron 4280. That 30-watt difference makes the 3280 the better pick for dense, power-constrained server environments where thermal envelope is a hard limit. It also uses the AMD Socket AM3+ platform, which is more common in desktop-oriented builds, and it supports integrated graphics through certain motherboards (as a chipset feature), something the Opteron 4280 lacks entirely. For a low-power file server or a basic virtualization host where absolute performance is secondary, the 3280’s efficiency profile is its practical advantage.

The average benchmark scores tell a similar story: the Opteron 4280 sits at 1107, while the Opteron 3280 is at 1106, a negligible 0.1% difference in aggregate. That near-identical average masks the fact that the 4280 wins every individual test; the gap likely comes from the 3280 having no Cinebench R15 single-core result in its benchmark set. In practice, the 4280’s higher base clock of 2.80 GHz versus 2.50 GHz gives it a consistent edge across all measured scenarios.

Architecture Differences

The two processors come from different architectural families. The Opteron 4280 uses the Bulldozer architecture with the Valencia codename, while the Opteron 3280 uses the K10 architecture with the Zurich codename. Both are manufactured on a 32 nm process at GlobalFoundries, and both pack 1,200 million transistors on a 315 mm² die. The cache layout is identical on paper: 384 KB of L1, 8 MB of L2, and 8 MB of shared L3.

The architectural split explains the performance delta. Bulldozer was designed for higher clock speeds and better multi-threaded throughput, which shows in the benchmark scores. The 4280’s base clock is 2.80 GHz, and its boost clock is 3.50 GHz. The 3280 has a lower base clock of 2.50 GHz but the same 3.50 GHz boost clock. That 0.30 GHz base-clock difference is the primary driver of the 4280’s consistent ~19% lead in every test, including single-core workloads where boost clocks are typically engaged.

Platform support diverges sharply. The 4280 uses AMD Socket C32, a server-focused socket, while the 3280 uses AMD Socket AM3+, a desktop-oriented socket. Memory bandwidth also differs: the 4280 offers 25.6 GB/s, while the 3280 offers 29.9 GB/s. That is a notable inversion, the lower-performing chip has higher theoretical memory bandwidth. The 3280 also has a desktop market segment designation, supports ECC memory as false, and can enable integrated graphics via certain motherboards (chipset feature). The 4280 is strictly server/workstation, supports ECC memory as true, and has no integrated graphics option.

FAQ

Q: Which processor has a higher boost clock?

A: Both processors share the same boost clock of 3.50 GHz. The difference is in the base clock: the Opteron 4280 runs at 2.80 GHz, while the Opteron 3280 runs at 2.50 GHz.

Q: Can I use the same motherboard for both CPUs?

A: No. The Opteron 4280 uses AMD Socket C32, while the Opteron 3280 uses AMD Socket AM3+. These are different sockets and are not interchangeable.

Q: Which chip supports ECC memory?

A: The Opteron 4280 supports ECC memory (true), while the Opteron 3280 does not (false). This makes the 4280 the appropriate choice for error-correcting memory configurations.

Q: Is there any benchmark where the Opteron 3280 wins?

A: No. In the head-to-head benchmark data, the Opteron 4280 wins all five tests. The Opteron 3280 has zero wins.

Q: How much larger is the Opteron 4280’s power draw?

A: The Opteron 4280 has a TDP of 95 watts, while the Opteron 3280 has a TDP of 65 watts. The 4280 draws 30 watts more at the thermal design point.

Q: Do both chips have the same number of cores and threads?

A: Yes. Both have 8 cores and 8 threads, with identical L1 (384 KB), L2 (8 MB), and L3 (8 MB shared) cache sizes.

Specification Differences

The two processors differ on several key specification fields. The most impactful difference is the base clock: 2.80 GHz for the Opteron 4280 versus 2.50 GHz for the Opteron 3280. The TDP also differs significantly, with the 4280 rated at 95 watts and the 3280 at 65 watts. The socket is different, AMD Socket C32 for the 4280 and AMD Socket AM3+ for the 3280. The architecture and codename are different (Bulldozer/Valencia versus K10/Zurich). The memory bandwidth is different, with the 3280 offering 29.9 GB/s versus 25.6 GB/s for the 4280. ECC memory support is true for the 4280 and false for the 3280. The market segment is Server/Workstation for the 4280 and Desktop for the 3280. The 3280 supports integrated graphics via certain motherboards (chipset feature), while the 4280 has none. The launch MSRP is $255 for the 4280 and $229 for the 3280. The release dates differ: the 4280 launched on 2011-11-13, while the 3280 launched on 2012-03-19. The part numbers are OS4280WLU8KGU for the 4280 and OS3280OLW8KGU for the 3280.

Head-to-Head Benchmarks

The benchmark data shows a consistent and substantial advantage for the Opteron 4280 across all five tested workloads. In Cinebench R15 multi-core, the 4280 scores 385 against 324 for the 3280, a delta of 18.8%. This is the smallest margin in the set. The Cinebench R20 multi-core result shows the 4280 at 1607 versus 1350, a 19% lead. The single-core tests are equally decisive: Cinebench R20 single-core shows 226 versus 190, an 18.9% gap, and Cinebench R23 single-core shows 540 versus 453, a 19.2% gap. The largest margin is in Cinebench R23 multi-core, where the 4280 scores 3828 versus 3215, also a 19.1% lead.

The consistency of these margins is notable. Every test lands within a narrow band of 18.8% to 19.2%, which suggests the performance difference is primarily driven by the base clock advantage rather than workload-specific factors. The 4280’s higher base clock of 2.80 GHz versus 2.50 GHz translates directly into a roughly 19% throughput advantage across both single-core and multi-core scenarios. The 3280’s higher memory bandwidth of 29.9 GB/s does not appear to compensate in these CPU-bound benchmarks, as the 4280 still wins decisively despite having 25.6 GB/s of bandwidth.

The aggregate average benchmark scores are nearly identical, 1107 for the 4280 and 1106 for the 3280, which reflects the fact that the 3280 lacks a Cinebench R15 single-core score in its benchmark set, pulling its average closer to the 4280 despite losing every head-to-head test. The percentile ranking for both chips is the same at 31, placing them in the lower third of all CPUs tracked.

The Verdict

The data is unambiguous: the AMD Opteron 4280 is the faster processor in every measured benchmark. If the workload demands raw compute performance, whether single-threaded or multi-threaded, the 4280 delivers a consistent ~19% advantage over the 3280. Its higher base clock of 2.80 GHz and Bulldozer architecture make it the correct choice for compute-heavy server tasks, and its ECC memory support adds reliability for data-integrity-sensitive applications. The only trade-off is the higher TDP of 95 watts versus 65 watts, which matters only in power-constrained environments.

The AMD Opteron 3280 is the pick for a different set of priorities. Its 65-watt TDP makes it the better fit for low-power server builds where thermal headroom is scarce. Its AMD Socket AM3+ platform is more common in desktop-oriented systems, and the ability to use integrated graphics via certain motherboards (chipset feature) can eliminate the need for a discrete GPU in basic configurations. The higher memory bandwidth of 29.9 GB/s is a minor advantage in memory-bound workloads, though the benchmark data does not show it translating into performance wins. For a light-duty server or a home lab where power efficiency and platform flexibility outweigh raw speed, the 3280 has a place. For everything else, the 4280 is the clear winner based on the benchmark results.