AMD Ryzen 5 1400 vs Intel Core i7-3820 Comparison

The Intel Core i7-3820 and the AMD Ryzen 5 1400 are both 4-core, 8-thread desktop processors, but they represent vastly different eras of design philosophy. The i7-3820 is a 2012-era Sandy Bridge-E part built for Intel's high-end Socket 2011 platform, while the Ryzen 5 1400 is a 2017-era Zen architecture chip on the mainstream AM4 platform. The benchmark data reveals a fascinating split: the Ryzen 5 1400 dominates in older Cinebench R15 tests, while the i7-3820 shows a significant advantage in the newer Cinebench R23 multi-core workload. This creates a complex picture for any potential user, as the "winner" depends entirely on the specific application and generation of software being run.

Head-to-Head Benchmarks

The most striking result in the head-to-head comparison is the complete reversal of fortune between Cinebench R15 and R23 tests. In the Cinebench R15 multi-core test, the AMD Ryzen 5 1400 scores 688, while the Intel Core i7-3820 scores only 496. This gives the Ryzen a 27.9% lead, a substantial margin that suggests the AMD chip handles the legacy R15 workload significantly better. The single-core R15 test is even more lopsided: the Ryzen 5 1400 posts 133.75 points versus the i7-3820's 69 points, a staggering 48.4% difference. This is not a marginal victory; the Ryzen 5 1400 is nearly twice as fast in this specific single-threaded test.

However, the narrative flips almost entirely when examining the Cinebench R23 results. In the R23 multi-core test, the Intel Core i7-3820 scores 4923, which is 23.5% higher than the Ryzen 5 1400's 3985. This is a decisive win for the older Intel chip, indicating that the Sandy Bridge architecture scales much better with the newer rendering engine's multi-threading requirements. The R23 single-core test, while still a win for AMD, is much closer. The Ryzen 5 1400 scores 832 compared to the i7-3820's 695, a 16.5% advantage for AMD. This is a far smaller margin than the R15 single-core delta, showing that the newer test narrows the per-core gap.

Looking at the broader averages, both processors land at the same percentile (37th) among all CPUs in the database, but their average benchmark scores are nearly identical: 1424 for the i7-3820 and 1410 for the Ryzen 5 1400. The nearest rivals for the i7-3820 include the Intel Xeon Bronze 3106 (average score 1422, delta 0.1%) and the Intel Core i5-4570S (average score 1426, delta -0.2%). The Ryzen 5 1400 is similarly bracketed by the Intel Core i5-4460 (average score 1415, delta -0.3%) and the AMD Ryzen 7 2700U (average score 1415, delta -0.4%). These figures confirm that, on an average basis, the two CPUs are effectively tied in overall performance, despite their wildly different behaviors across specific workloads.

Where Each One Wins

The data clearly indicates that the AMD Ryzen 5 1400 is the superior choice for applications that rely on the Cinebench R15 test, particularly single-threaded performance. The 48.4% lead in R15 single-core and the 27.9% lead in R15 multi-core suggest that this chip is far more efficient at executing the older instruction patterns and memory access routines used in that benchmark. This could translate to better performance in legacy software, older games, or applications that have not been updated to take advantage of newer CPU features. The Ryzen 5 1400 also wins the R23 single-core test by 16.5%, so it maintains a per-core advantage even in the modern benchmark suite.

Conversely, the Intel Core i7-3820 is the clear winner in the Cinebench R23 multi-core test, with a 23.5% margin over the Ryzen. This indicates that the i7-3820's architecture, with its larger 10 MB shared L3 cache and quad-channel memory bus, is better suited to heavily multi-threaded, modern workloads that can saturate all eight threads. The i7-3820 also has a higher base clock (3.60 GHz) and boost clock (3.80 GHz) compared to the Ryzen 5 1400's 3.20 GHz and 3.40 GHz, respectively. While clock speed alone does not tell the whole story, it contributes to the i7-3820's strong showing in the R23 multi-core test. For users running contemporary video rendering, 3D modeling, or scientific simulations that are optimized for many threads, the i7-3820 appears to hold a significant edge.

The average benchmark score, which is nearly identical for both (1424 vs 1410), suggests that neither chip has a universal advantage. The choice hinges on the specific software environment. If the workload is dominated by older, less optimized applications, the Ryzen 5 1400 is the better pick. If the workload is modern and heavily multi-threaded, the i7-3820 is the winner. The Ryzen 5 1400 also has a massive TDP advantage, rated at 65 watts compared to the i7-3820's 130 watts, which means it will produce far less heat and require less robust cooling.

The Verdict

Based strictly on the benchmark data, the decision between these two processors is not a simple one. The AMD Ryzen 5 1400 wins three out of the four head-to-head comparisons, including the all-important modern single-core test (R23) and both R15 tests. Its 48.4% lead in R15 single-core is particularly notable, as it indicates a fundamental efficiency advantage in per-thread execution for that workload. For users who prioritize compatibility with older software and applications that are not heavily multi-threaded, the Ryzen 5 1400 is the clear choice. Its 65-watt TDP also makes it far easier to cool and integrate into a mainstream system.

However, the single most impactful modern test, Cinebench R23 multi-core, belongs to the Intel Core i7-3820. The 23.5% margin here is substantial and suggests that for current, fully multi-threaded rendering tasks, the i7-3820 is the more capable processor. This is a surprising result given its age, but the data is clear. Users who run the latest video encoding, 3D rendering, or batch processing software that can effectively use all 8 threads should favor the i7-3820 despite its higher power draw and older platform. The i7-3820 also supports quad-channel DDR3 memory with a theoretical bandwidth of 51.2 GB/s, which is higher than the Ryzen 5 1400's dual-channel DDR4 bandwidth of 42.7 GB/s, potentially aiding in memory-intensive workloads.

The final verdict is that the AMD Ryzen 5 1400 is the better general-purpose processor due to its superior single-core performance and efficiency, but the Intel Core i7-3820 is the specialist for modern multi-threaded tasks. The Ryzen 5 1400's wins in 3 of 4 tests, including both R15 runs, give it the broader appeal. The i7-3820's single win is decisive in its niche, but it is a narrow niche. For a user building a new system today, the Ryzen 5 1400 is the safer bet. For someone upgrading an existing Socket 2011 platform, the i7-3820 remains a viable option for multi-core workloads.

FAQ

Q: Which processor is faster in single-core performance?

A: The AMD Ryzen 5 1400 is faster in single-core tests. It scores 133.75 in Cinebench R15 single-core versus 69 for the Intel Core i7-3820, a 48.4% difference. In Cinebench R23 single-core, the Ryzen scores 832 versus 695, a 16.5% advantage.

Q: How do the two processors compare in multi-core performance?

A: It depends on the test. In Cinebench R15 multi-core, the AMD Ryzen 5 1400 wins with 688 versus 496 for the Intel Core i7-3820, a 27.9% lead. However, in Cinebench R23 multi-core, the Intel Core i7-3820 wins with 4923 versus 3985, a 23.5% margin for Intel.

Q: What are the average benchmark scores for these CPUs?

A: The Intel Core i7-3820 has an average benchmark score of 1424, while the AMD Ryzen 5 1400 has an average score of 1410. Both processors sit in the 37th percentile among all CPUs in the database.

Q: Which processor has a higher clock speed?

A: The Intel Core i7-3820 has a base clock of 3.60 GHz and a boost clock of 3.80 GHz. The AMD Ryzen 5 1400 has a lower base clock of 3.20 GHz and a boost clock of 3.40 GHz.

Q: What is the difference in power consumption?

A: The AMD Ryzen 5 1400 has a TDP of 65 watts, which is significantly lower than the Intel Core i7-3820's TDP of 130 watts. This makes the Ryzen much more power-efficient.

Q: Do these processors support ECC memory?

A: Yes, the AMD Ryzen 5 1400 supports ECC memory, while the Intel Core i7-3820 does not. This is a notable feature for users who require error-correcting memory for stability in critical workloads.

Architecture Differences

The architectural gap between these two CPUs is vast. The Intel Core i7-3820 is built on a 32 nm process by Intel, with a die size of 294 mm² and 1,270 million transistors. It uses the Sandy Bridge microarchitecture, specifically the Sandy Bridge-E variant, and is designed for the Intel Socket 2011 platform. This is a high-end desktop platform that supports quad-channel DDR3 memory with a maximum bandwidth of 51.2 GB/s. The CPU provides 40 PCIe Gen 2 lanes, which is a high number for the era, and it lacks integrated graphics. Its cache hierarchy includes 64 KB of L1 per core, 256 KB of L2 per core, and a 10 MB shared L3 cache. The i7-3820 has an unlocked multiplier, making it overclockable, and was launched at an MSRP of $305.

In contrast, the AMD Ryzen 5 1400 is built on a 14 nm process at GlobalFoundries, with a die size of 213 mm² and 4,800 million transistors. It uses the Zen architecture (Summit Ridge) and is designed for the AMD Socket AM4 platform. This is a mainstream platform that supports dual-channel DDR4 memory with a maximum bandwidth of 42.7 GB/s. The CPU provides 16 PCIe Gen 3 lanes, which is fewer lanes but a newer standard than the i7-3820. It also lacks integrated graphics. The cache hierarchy includes a larger 96 KB of L1 per core, 512 KB of L2 per core, and a smaller 8 MB shared L3 cache. The Ryzen 5 1400 also has an unlocked multiplier and supports ECC memory, a feature absent on the Intel chip. It was launched at an MSRP of $169.

The most significant differences are the memory bus (quad-channel DDR3 versus dual-channel DDR4) and the PCIe support (Gen 2 with 40 lanes versus Gen 3 with 16 lanes). The i7-3820's quad-channel memory interface provides a theoretical bandwidth advantage, but it requires a more expensive motherboard and memory configuration. The Ryzen 5 1400's dual-channel DDR4 support is simpler and more affordable, and its higher transistor count (4,800 million versus 1,270 million) reflects the modern design's complexity. The Ryzen 5 1400 is also a much more power-efficient design, with a 65-watt TDP versus the i7-3820's 130 watts. The i7-3820 is classified as end-of-life, while the Ryzen 5 1400 remains active in production. These architectural differences explain the divergent benchmark results, particularly the Ryzen's single-core strength and the Intel chip's multi-core capability in newer tests.