AMD Opteron 6212 vs Intel Core i5-2550K Comparison

The Verdict

The benchmark data is unequivocal: the Intel Core i5-2550K is the faster processor in every recorded head-to-head test. Across five Cinebench comparisons, the Intel part wins all five, with margins ranging from 6.8% to 7.4%. The AMD Opteron 6212, despite having twice the core count (8 cores versus 4), cannot convert that hardware advantage into a single benchmark victory. The average benchmark score also favors Intel, at 1136 versus AMD's 1162, a gap of about 2.2% in favor of the Opteron, but that aggregate figure masks the fact that the Opteron's average is buoyed by a different mix of tests, while the direct comparisons all go to the Core i5.

For a buyer choosing between these two end-of-life parts, the decision hinges on workload and platform. The Intel Core i5-2550K is the pick for anyone running Cinebench-style rendering tasks, single-threaded applications, or desktop workloads where its higher clock speeds (3.40 GHz base, 3.80 GHz boost) and unlocked multiplier provide a clear edge. The AMD Opteron 6212, a server and workstation part on Socket G34 with ECC memory support and quad-channel DDR3, is the choice only for systems that need those specific platform features, not for raw compute performance. Its 115W TDP is higher than the Intel's 95W, and its 2.60 GHz base clock is substantially lower, so the data shows no scenario where the Opteron wins on speed. The verdict is simple: the Core i5-2550K is the performance winner, and the Opteron 6212 is a niche server part that loses every direct benchmark comparison.

FAQ

Q: Which processor has more cores?

A: The AMD Opteron 6212 has 8 cores and 8 threads, while the Intel Core i5-2550K has 4 cores and 4 threads. Despite this 2x core advantage, the Opteron loses all five head-to-head Cinebench tests.

Q: What are the clock speed differences?

A: The Intel Core i5-2550K runs at 3.40 GHz base and 3.80 GHz boost, compared to the AMD Opteron 6212's 2.60 GHz base and 3.20 GHz boost. The Intel part's boost clock is 0.60 GHz higher than the AMD's boost, and its base clock is 0.80 GHz higher.

Q: Which processor supports ECC memory?

A: The AMD Opteron 6212 supports ECC memory and uses quad-channel DDR3 with 51.2 GB/s memory bandwidth. The Intel Core i5-2550K does not support ECC memory and uses dual-channel DDR3 with 25.6 GB/s memory bandwidth.

Q: What is the average benchmark score difference?

A: The AMD Opteron 6212 has an average benchmark score of 1162, while the Intel Core i5-2550K scores 1136. The Opteron sits at the 33rd percentile of all CPUs, and the Core i5 is at the 32nd percentile.

Q: Are these processors unlocked for overclocking?

A: The Intel Core i5-2550K has an unlocked multiplier (the "K" suffix indicates this), while the AMD Opteron 6212 does not. This gives the Intel part overclocking flexibility that the AMD part lacks.

Q: What are the biggest single benchmark margins?

A: The largest margin is in Cinebench R20 single-core, where the Intel Core i5-2550K leads by 7.4% (215 versus 199). The smallest margin is in Cinebench R15 multi-core, where Intel leads by 6.8% (365 versus 340).

Architecture Differences

The AMD Opteron 6212 is built on the Bulldozer architecture, codenamed Interlagos, and belongs to the Opteron 6000 series. It is fabricated on a 32 nm process at GlobalFoundries, with 2,400 million transistors spread across a dual-die design measuring 2x 315 mm². Its cache hierarchy is module-based: 768 KB of L1 cache, 2 MB of L2 per module, and 8 MB of L3 per die. This is a server and workstation part designed for Socket G34, with a 115W TDP and a market segment explicitly listed as Server/Workstation. The architecture prioritizes multi-threaded throughput through eight physical cores, but the benchmark results indicate that this design does not translate into competitive Cinebench scores against the Intel part.

The Intel Core i5-2550K is built on the Sandy Bridge architecture, also on a 32 nm process but at Intel's own foundry. It uses 1,160 million transistors on a 216 mm² die, roughly half the transistor count and a much smaller die than the AMD part. Its cache layout is per-core: 64 KB of L1 per core, 256 KB of L2 per core, and 6 MB of shared L3. This is a desktop part on Socket 1155 with a 95W TDP. The Sandy Bridge design favors higher clock speeds and lower latency per core, which is reflected in the single-core Cinebench results, where Intel leads by 7.0% in R23 single-core and 7.4% in R20 single-core. The architectural divergence is stark, AMD's Bulldozer leans on many cores and large shared caches, while Intel's Sandy Bridge concentrates on per-core efficiency and frequency.

Specification Differences

The two processors differ on nearly every major specification field. The core count is 8 versus 4, and thread count is 8 versus 4. Base clocks are 2.60 GHz base on AMD versus 3.40 GHz on Intel, and boost clocks are 3.20 GHz versus 3.80 GHz. TDP is 115W for AMD and 95W for Intel. Sockets are completely different, AMD Socket G34 versus Intel Socket 1155. Memory support is DDR3 for both, but AMD runs quad-channel with 51.2 GB/s bandwidth, Intel runs dual-channel with 25.6 GB/s. ECC memory is supported on AMD but not on Intel. Transistors are 2,400 million on AMD versus 1,160 million on Intel, and die size is 2x 315 mm² versus 216 mm². L1 cache is 768 KB total on AMD versus 64 KB per core on Intel. L2 cache is 2 MB per module on AMD versus 256 KB per core on Intel. L3 cache is 8 MB per die on AMD versus 6 MB shared on Intel. The Intel part has an unlocked multiplier, the AMD does not. The market segment is Server/Workstation for AMD and Desktop for Intel. Release dates differ, AMD launched in November 2011, Intel in January 2012. The launch MSRP is $266 for AMD and $235 for Intel. PCIe is Gen 2 for both, but the Intel listing specifies 16 lanes (CPU only) while AMD's listing does not specify lane count.

The only major similarities are the 32 nm process node, DDR3 memory support, the absence of integrated graphics on both, and the end-of-life production status for both parts. The specification differences show two parts designed for entirely different purposes, with Intel's part built for desktop responsiveness and AMD's part built for server memory capacity and ECC reliability.

Head-to-Head Benchmarks

The head-to-head data shows a clean sweep for the Intel Core i5-2550K across all five Cinebench tests. In Cinebench R15 multi-core, Intel scores 365 against AMD's 340, a 6.8% lead. In Cinebench R20 multi-core, Intel scores 1523 against AMD's 1418, a 6.9% margin. The single-core tests show even larger gaps. In Cinebench R20 single-core, Intel scores 215 against AMD's 199, a 7.4% difference, the largest margin in the entire comparison. In Cinebench R23 multi-core, Intel scores 3628 against AMD's 3377, a 6.9% gap, and in Cinebench R23 single-core, Intel scores 512 against AMD's 476, a 7.0% difference.

The pattern is consistent: Intel wins every test, and the margins are tightly clustered between 6.8% and 7.4%. There is no test where the Opteron's 8 cores overcome the Core i5's clock advantage. The multi-core tests are nearly identical in margin to the single-core tests, which is telling. If the Opteron's extra cores provided any multi-threaded benefit, the multi-core margins would shrink relative to single-core. They do not; the R15 multi-core margin is 6.8%, and the R20 multi-core margin is 6.9%, essentially the same as the single-core margins. This indicates that the Intel part's higher clock speeds and architectural efficiency dominate the AMD part's core count advantage.

The average benchmark scores tell a slightly different story, with AMD at 1162 and Intel at 1136, a 2.3% difference in AMD's favor. But this aggregate includes a broader set of benchmarks beyond the head-to-head tests, and the direct comparisons are what matter. The Intel Core i5-2550K's nearest rivals include the Intel Core i5-3570T at an identical 1136 average score, the Intel Xeon E5640 at 1137, and the Intel Core i3-N300 at 1135, all within 0.2% of the Core i5. The AMD Opteron 6212's nearest rivals include the Intel Core i5-3450 at 1166, a 0.4% gap, and the AMD Opteron 6220 at 1168, a 0.5% gap. Both parts sit near the 32nd to 33rd percentile of all CPUs, indicating neither is a standout performer in the broader database.

Where Each One Wins

The Intel Core i5-2550K wins in every measured category. It wins all five Cinebench tests, it has higher base and boost clocks, it has a lower TDP, it has an unlocked multiplier for overclocking, and it has a lower launch MSRP. Its wins are consistent across both single-core and multi-core workloads, with no scenario in the data where the AMD Opteron 6212 takes a lead. The Intel part is the clear choice for rendering tasks, single-threaded applications, and any workload that benefits from higher clock speeds. The unlocked multiplier adds overclocking potential, which could extend its performance advantage further, though the database does not include overclocked results.

The AMD Opteron 6212 wins only in platform features, not in performance. It supports ECC memory, which is critical for error-sensitive server and workstation workloads. It has quad-channel memory with 51.2 GB/s bandwidth, double the Intel part's 25.6 GB/s, which matters for memory-bandwidth-intensive server applications. It has more cores (8 versus 4), more L3 cache (8 MB per die versus 6 MB shared), and a higher transistor count (2,400 million versus 1,160 million). Its market segment is explicitly Server/Workstation, and its Socket G34 platform supports the Opteron 6000 series ecosystem. For a user building a server that requires ECC memory and maximum memory bandwidth, the Opteron 6212 provides those capabilities, but it does so with lower benchmark scores across the board. The data shows no performance scenario where the Opteron wins, so its appeal is entirely limited to specific server platform requirements.