CPU Comparison

The AMD Opteron 3365 and AMD Opteron 6234 are two end-of-life server processors that, despite their very different architectures and core counts, land in nearly the same performance tier. The 3365 is an 8-core, 8-thread K10 part from the Opteron 3000 series, while the 6234 is a 12-core, 12-thread Bulldozer part from the Opteron 6000 series. Benchmark data shows a remarkably tight contest, with the 3365 edging ahead in every single recorded test, but the margins are so thin, often less than half a percent, that the choice between them hinges less on raw speed and more on platform-level features and architectural trade-offs.

Head-to-Head Benchmarks

The head-to-head results paint a picture of near-identical performance, with the AMD Opteron 3365 winning all five recorded benchmarks by the slimmest of margins. In Cinebench R15 multicore, the 3365 scores 349 against the 6234's 348, a delta of just 0.3%. That pattern repeats in Cinebench R20 multicore, where the 3365 posts 1457 versus 1453, again a 0.3% lead. The single-core tests tell the same story: the 3365 scores 205 in Cinebench R20 single-core versus 204 for the 6234 (a 0.5% advantage), and 489 versus 488 in Cinebench R23 single-core (a 0.2% edge).

The most substantial gap appears in Cinebench R23 multicore, where the 3365 reaches 3470 and the 6234 trails at 3461, still only a 0.3% difference. What is striking here is that the 3365 achieves these results with 8 cores and 8 threads, while the 6234 has 12 cores and 12 threads. The 6234's extra four cores are effectively neutralized by its lower boost clock of 3.00 GHz compared to the 3365's 3.30 GHz, and by the architectural inefficiencies of Bulldozer versus K10. The data suggests that in these Cinebench workloads, the 3365's higher clock speed and more efficient per-core design compensate fully for its core-count deficit.

Looking at the broader average benchmark score, the two are essentially tied: the 3365 averages 1194, while the 6234 averages 1191. This places the 3365 at the 34th percentile of all CPUs and the 6234 at the 33rd percentile. Their nearest rivals are also nearly identical, the 3365 sits within 0.1% of the AMD Athlon PRO 300U and Intel Core i3-4170, while the 6234 is within 0.1% of the Intel Core i5-4460T. The data implies that neither processor offers a meaningful performance advantage in these tests; the 3365's 5-0 win record is statistically trivial.

The Verdict

From the benchmark data alone, the AMD Opteron 3365 is the nominal winner, but the margins are so small that they are unlikely to be perceptible in real-world use. The 3365 wins all five head-to-head tests, yet the largest delta is 0.5% in Cinebench R20 single-core. If a decision were made purely on Cinebench scores, the 3365 is the pick, but only by a hair.

However, the data also reveals that the 6234 offers capabilities the 3365 lacks. The 6234 supports ECC memory, while the 3365 does not list ECC as a feature. The 6234 also has a quad-channel memory bus with 51.2 GB/s bandwidth, versus the 3365's dual-channel 29.9 GB/s. For server workloads that rely on memory bandwidth or require error correction, the 6234 is the more appropriate choice despite its slight benchmark deficit. The 3365 counters with a much lower TDP of 65 watts versus 115 watts, making it the more power-efficient option in the data.

The verdict depends on priorities. For raw Cinebench performance, the 3365 wins every test. For memory bandwidth, ECC support, and core count, the 6234 is the data-backed choice. The 6234 also carries a launch MSRP of $377, which is the only pricing information available; the 3365 has no listed launch MSRP.

Where Each One Wins

The AMD Opteron 3365 wins in every benchmark category recorded: multicore and single-core tests across Cinebench R15, R20, and R23. Its highest relative advantage is in Cinebench R20 single-core, where it leads by 0.5%. This suggests that workloads which are lightly threaded and clock-sensitive will slightly favor the 3365, given its 3.30 GHz boost clock versus the 6234's 3.00 GHz. The 3365 also wins on power efficiency, with a 65-watt TDP that is 50 watts lower than the 6234's 115-watt TDP.

The AMD Opteron 6234 wins on structural attributes rather than benchmark scores. It doubles the transistor count (2,400 million versus 1,200 million) and has a larger L1 cache (768 KB versus 384 KB). Its L2 cache is organized as 2 MB per module, and it features 8 MB of L3 per die across two dies, whereas the 3365 has 4 MB of L2 and 8 MB of shared L3. The 6234's quad-channel memory bus more than doubles the memory bandwidth (51.2 GB/s versus 29.9 GB/s), and it is the only one of the two with ECC memory support. For multi-socket server configurations or memory-intensive database workloads, the 6234's platform advantages are clear.

FAQ

Q: Which processor has a higher single-core benchmark score?

A: The AMD Opteron 3365 wins both single-core tests. It scores 205 in Cinebench R20 single-core versus 204 for the 6234, and 489 in Cinebench R23 single-core versus 488.

Q: Does the AMD Opteron 6234 support ECC memory?

A: Yes, the 6234 lists ECC memory as a supported feature. The AMD Opteron 3365 does not list ECC memory support in its specifications.

Q: How much memory bandwidth does each processor provide?

A: The AMD Opteron 3365 provides 29.9 GB/s over a dual-channel memory bus, while the AMD Opteron 6234 provides 51.2 GB/s over a quad-channel memory bus.

Q: What is the core and thread count difference?

A: The AMD Opteron 3365 has 8 cores and 8 threads. The AMD Opteron 6234 has 12 cores and 12 threads.

Q: Which processor has a lower TDP?

A: The AMD Opteron 3365 has a TDP of 65 watts, which is lower than the AMD Opteron 6234's TDP of 115 watts.

Q: What are the average benchmark scores for each?

A: The AMD Opteron 3365 has an average benchmark score of 1194, and the AMD Opteron 6234 has an average benchmark score of 1191.

Architecture Differences

The two processors come from different architectural families. The AMD Opteron 3365 uses the K10 architecture with the codename "Delhi," while the AMD Opteron 6234 uses the Bulldozer architecture with the codename "Interlagos." Both are built on a 32 nm process node by GlobalFoundries, but the similarities end there. The 3365 is a monolithic die of 315 mm² with 1,200 million transistors, whereas the 6234 is a dual-die design with 2x 315 mm² and 2,400 million transistors.

The cache hierarchies differ significantly. The 3365 has 384 KB of L1 cache, 4 MB of L2, and 8 MB of shared L3. The 6234 has 768 KB of L1, 2 MB of L2 per module, and 8 MB of L3 per die. This means the 6234's L3 cache is distributed across two dies, while the 3365's L3 is a single shared pool. The 6234's Bulldozer design uses modular cores that share resources, which explains why its 12 cores do not outperform the 3365's 8 K10 cores in these benchmarks.

The sockets also differ: the 3365 uses AMD Socket AM3+, while the 6234 uses AMD Socket G34. The 3365 can optionally use integrated graphics on certain motherboards as a chipset feature, while the 6234 has no integrated graphics listed. Both support DDR3 memory and PCIe Gen 2, but the 6234's quad-channel memory controller gives it a distinct bandwidth advantage.

Specification Differences

The key specification differences between the two processors are clear. The AMD Opteron 3365 has 8 cores and 8 threads, while the AMD Opteron 6234 has 12 cores and 12 threads. Base clocks are close, 2.30 GHz for the 3365 and 2.40 GHz for the 6234, but the boost clocks favor the 3365 at 3.30 GHz versus 3.00 GHz. The TDP difference is substantial: 65 watts for the 3365 versus 115 watts for the 6234.

Memory support is a major differentiator. The 3365 uses a dual-channel memory bus with 29.9 GB/s bandwidth, while the 6234 uses a quad-channel bus with 51.2 GB/s bandwidth. ECC memory is supported on the 6234 but not listed on the 3365. The sockets differ (AM3+ versus G34), and the transistor counts are 1,200 million versus 2,400 million. The die sizes are 315 mm² for the 3365 and 2x 315 mm² for the 6234. The 6234 has a launch MSRP of $377, while the 3365 has no listed launch MSRP. Finally, the 6234 has a release date of November 13, 2011, while the 3365's release date is not provided.