AMD Opteron 6328

The AMD Opteron 6328 is an 8-core, 8-thread server processor built on the Piledriver architecture (codename Abu Dhabi) for the AMD Socket G34 platform. Launched on 2012-11-04 with a launch MSRP of $575, this 32nm part features a base clock of 3.20 GHz and a boost clock of 3.80 GHz. It is now end-of-life, but its benchmark profile places it in the 36th percentile of all tested CPUs, with an average benchmark score of 1304. The part number is OS6328WKT8GHK, targeting the Server/Workstation market segment with support for DDR3 memory, ECC, and quad-channel bandwidth.

Single-Thread vs Multi-Thread Behavior

The split between single-thread and multi-thread performance is stark. In Cinebench R23, the multi-core score of 4510 contrasts sharply with the single-core score of 636. This pattern repeats across R15 (454 multi vs 64 single) and R20 (1894 multi vs 267 single). The data indicates a processor that scales exceptionally well with core count, but struggles with lightly-threaded workloads. The 8 physical cores, without simultaneous multithreading (8 threads total), rely entirely on core count for throughput. The base clock of 3.20 GHz and boost clock of 3.80 GHz are moderate, but the Piledriver architecture's IPC is the limiting factor.

For real-world applications, this means heavily parallel tasks like video rendering or batch data processing will utilize the silicon effectively, whereas legacy single-threaded office applications or older games will see performance bottlenecked by the Piledriver core's modest IPC. The consistent scaling across Cinebench generations suggests that the architecture's multi-threaded efficiency is a defining characteristic, yet the absolute single-core scores remain low enough to limit everyday responsiveness. The cache hierarchy, consisting of 384 KB of L1, 2 MB per module of L2, and 8 MB per die of L3, is designed to feed the 8 cores, but the latency characteristics of the 32nm process and Piledriver design hinder single-thread performance.

Power and Thermals

The Opteron 6328 carries a TDP of 115 W, which is modest for a dual-die server part. The 32 nm process from GlobalFoundries packs 2,400 million transistors across a combined die size of 2x 315 mm². This thermal envelope implies a need for a standard server-grade air cooler capable of dissipating 115 W, but it does not demand exotic liquid cooling. The platform supports DDR3 memory via a quad-channel interface, providing a memory bandwidth of 59.7 GB/s. ECC memory support is a critical feature for server stability. There is no integrated graphics, so a discrete GPU is mandatory. The PCIe Gen 2 interface is a limiting factor for modern high-bandwidth accelerators.

The large die area and 115 W TDP mean that heat dissipation is manageable with a capable air cooler, but the 32nm process node is inefficient by modern standards, generating more heat per transistor than newer processes. For a server platform, the 115 W TDP is well within the envelope of standard 1U and 2U heatsinks, making cooling a straightforward affair. The quad-channel DDR3 memory controller, with its 59.7 GB/s bandwidth, is a significant advantage over consumer desktop platforms of the same era, which typically used dual-channel memory.

Who Should Consider It

This CPU is a niche product today. Given its 36th percentile ranking and its multi-core scaling, it is best suited for throughput-oriented server tasks. The 8 cores and 8 threads, combined with 59.7 GB/s of quad-channel DDR3 bandwidth, make it a viable candidate for a homelab server running virtualized workloads, container hosts, or network-attached storage with heavy parity calculations. It is not recommended for gaming or general desktop use, as the single-core score of 636 in Cinebench R23 will bottleneck most modern game engines. For office productivity, the low single-thread performance means spreadsheet and document rendering will feel sluggish compared to modern low-end chips.

Its primary value lies in multi-threaded server applications where ECC memory and core count outweigh single-thread speed. The end-of-life status means it appeals to enthusiasts building legacy systems or those needing a cheap ECC-capable platform. The 36th percentile ranking places it below the majority of CPUs, but within the context of legacy server hardware, it offers a specific set of trade-offs. For database hosting or web servers that utilize multiple threads, the 8 cores provide adequate throughput. For single-threaded scripting or application servers, the performance will be disappointing.

How It Compares

Intel Pentium Silver N6005: The Opteron 6328 and the Pentium Silver N6005 both achieve an average score of 1304, resulting in a deltaPct of 0%. This parity is striking given the different market positions. The Opteron's higher core count is entirely offset by the N6005's architectural efficiency in synthetic benchmarks.

AMD Athlon Gold 7220U: The Opteron trails the Athlon Gold 7220U by 0.6%, with the Athlon scoring 1311 against the Opteron's 1304. The Athlon Gold edges out the Opteron in average benchmark scores, demonstrating that newer architectures can close the core count gap.

Intel Core i7-2600: The Opteron falls 0.8% behind the Intel Core i7-2600, which scores 1314. The Opteron's weaker single-thread performance (R23 single 636) drags its average down to nearly match the i7.

Intel Core i7-3770T: The gap widens slightly to 1.1% against the Core i7-3770T, which scores 1319. The Opteron's 8 cores cannot compensate for the architectural IPC deficit, resulting in a lower average score.

Benchmark Performance

The benchmark data paints a clear picture of a processor that was designed for a specific era. The Opteron 6328's average benchmark score of 1304 places it in the 36th percentile of all tested CPUs. In Cinebench R23, the multi-core score of 4510 is significantly higher than the single-core score of 636, but this strong scaling is from a very low single-thread baseline. The R20 results (1894 multi, 267 single) and R15 results (454 multi, 64 single) follow the exact same proportional pattern.

When compared to its nearest rivals, the Opteron is statistically tied with the Pentium Silver N6005 (0% delta), while lagging the Athlon Gold 7220U (-0.6%), the Core i7-2600 (-0.8%), and the Core i7-3770T (-1.1%). The tight clustering of these rivals, all within a 1.1% band, shows that the Opteron 6328 sits at a performance equilibrium with several very different processor designs. Its 8 cores and 3.80 GHz boost clock are insufficient to overcome the architectural advancements of its rivals. The 2,400 million transistors on a 32 nm process are utilized inefficiently for single-thread tasks. For multi-threaded workloads, the 4510 R23 score is respectable, but the platform's PCIe Gen 2 and DDR3 memory support limit its modern applicability. The data confirms that this end-of-life server chip is best left to legacy systems or highly specific multi-threaded homelab scenarios where ECC memory is a hard requirement. The consistent scaling across all three Cinebench versions highlights a balanced multi-threaded design, yet the absolute scores remain low in the overall distribution.