Intel Core i5-6500 vs Intel Pentium Gold G6400 Comparison

Head-to-Head Benchmarks

The benchmark data presents a clear picture: the Intel Core i5-6500 wins 14 of the 16 recorded head-to-head comparisons, while the Pentium Gold G6400 takes only 2. The most striking result is in Passmark extended instructions, where the i5-6500 scores 6549 against 1784 for the Pentium, a 267.1% advantage. That is not a marginal gap; it indicates a fundamental difference in how the two processors handle advanced instruction workloads.

Cinebench results consistently favor the i5-6500 by a wide margin. In Cinebench R15 multicore, the i5-6500 scores 479 versus 305, a 57% lead. The pattern repeats in Cinebench R20 multicore (1999 vs 1272, 57.2% ahead) and in Cinebench R23 multicore (4760 vs 3030, 57.1% ahead). Even in single-core Cinebench tests, where the Pentium's higher clock speed might be expected to help, the i5-6500 wins: 282 vs 179 in R20 single-core (57.5% ahead) and 672 vs 427 in R23 single-core (57.4% ahead). These single-core results are notable because the Pentium Gold G6400 has a 4.00 GHz base clock with no boost clock recorded, while the i5-6500 has a 3.20 GHz base and 3.60 GHz boost. The older Skylake chip still outperforms in single-threaded rendering despite the clock disadvantage.

Passmark integer math is the closest contest among the multi-threaded workloads. The i5-6500 scores 14585 versus 13941, a modest 4.6% edge. Data encryption is similarly close for a different reason: 1678 vs 1535, a 9.3% lead. These are the only two tests where the margin falls below 10%. In contrast, Passmark find prime numbers shows a 58.8% advantage for the i5-6500 (27 vs 17), and floating point math shows a 41% lead (12391 vs 8788). The i5-6500 also leads in data compression by 21.8% (76510 vs 62806), multithread by 36.1% (5604 vs 4118), physics by 24.2% (442 vs 356), and random string sorting by 16.5% (9357 vs 8034).

The Pentium Gold G6400's only wins come in Passmark single-thread and Passmark singlethread, which are the same test recorded twice. It scores 2457 against 2093, a 14.8% advantage. That is a real strength, and it aligns with the Pentium's higher base clock, but it stands alone against the i5-6500's dominance elsewhere.

Architecture Differences

The two processors come from different Intel design eras and different sockets. The i5-6500 is built on the Skylake architecture, uses the Intel Socket 1151, and belongs to the Core i5 (Skylake) generation. The Pentium Gold G6400 uses the Comet Lake architecture, fits the Intel Socket 1200, and belongs to the Pentium Gold (Comet Lake) generation. Both use a 14 nm process node from Intel's own foundry, so the manufacturing process is identical, but the design philosophies differ.

Core and thread counts are a major differentiator. The i5-6500 has 4 cores and 4 threads, while the Pentium Gold G6400 has 2 cores and 4 threads. Both support four threads total, but the i5-6500 does so with four physical cores, whereas the Pentium relies on two physical cores with Hyper-Threading to reach four threads. This explains the i5-6500's large multicore leads in Cinebench and Passmark multithread tests.

Cache configurations also differ. Both share the same per-core L1 cache (64 KB per core) and L2 cache (256 KB per core). The L3 cache, however, favors the i5-6500: 6 MB shared versus 4 MB shared on the Pentium. That extra 2 MB of shared L3 likely contributes to the i5-6500's advantage in memory-sensitive workloads like data compression and random string sorting.

Memory bandwidth is one area where the Pentium Gold G6400 actually has the specification advantage. The i5-6500 has a recorded memory bandwidth of 34.1 GB/s, while the Pentium Gold G6400 reaches 42.7 GB/s. Both support DDR4 memory in dual-channel mode, and neither supports ECC memory. The Pentium's higher bandwidth does not translate into benchmark wins in the recorded data, however, as the i5-6500 wins all memory-related workloads tested.

Integrated graphics differ as well. The i5-6500 carries HD Graphics 530, while the Pentium Gold G6400 uses UHD Graphics 610. The database does not include graphics benchmarks, so a direct performance comparison is not possible from the recorded data. Both processors offer PCIe Gen 3 with 16 lanes from the CPU only. Neither has an unlocked multiplier, so overclocking is not supported on either part.

The release timeline shows a significant gap. The i5-6500 was released in July 2015 and is marked as end-of-life. The Pentium Gold G6400 arrived in April 2020 and remains active in production. The process node stayed at 14 nm across both generations, which explains why the newer Pentium does not dramatically outclass the older i5 in raw throughput.

The Verdict

The data supports a straightforward conclusion: the Intel Core i5-6500 is the stronger processor in nearly every recorded workload. It wins 14 of 16 head-to-head comparisons, including every Cinebench test, every multi-threaded Passmark test, and even single-core Cinebench tests despite the Pentium's higher base clock. The i5-6500's four physical cores and larger 6 MB L3 cache give it a structural advantage that the Pentium's higher clock speed cannot overcome.

The Pentium Gold G6400's case rests on two pillars: Passmark single-thread performance and platform recency. Its 2457 single-thread score is 14.8% ahead of the i5-6500's 2093, making it the better choice for lightly threaded applications that depend on raw clock speed. It also uses the Socket 1200 platform, which is current and active, while the i5-6500's Socket 1151 platform is end-of-life.

For anyone building a system for multi-threaded productivity, rendering, or data-heavy tasks, the i5-6500 is the clear pick from the recorded data. For a low-power, single-thread-focused build where the newest platform matters, the Pentium Gold G6400 has a defined but narrow role. The i5-6500 also ranks at the 63rd percentile among all CPUs, matching the Pentium's 63rd percentile, so their overall standing in the database is identical despite the i5-6500's higher average benchmark score of 7569 versus 6969.

FAQ

Q: Which processor has better multi-core performance?

A: The Intel Core i5-6500 wins every multi-core benchmark in the database. It leads by 57% in Cinebench R15 multicore (479 vs 305), 57.2% in Cinebench R20 multicore (1999 vs 1272), and 57.1% in Cinebench R23 multicore (4760 vs 3030).

Q: Does the Pentium Gold G6400 win any benchmarks?

A: Yes, it wins Passmark single-thread with a score of 2457 versus 2093 for the i5-6500, a 14.8% advantage. That is the only test category where it comes out ahead.

Q: How does the single-core Cinebench performance compare?

A: The i5-6500 wins in single-core Cinebench despite the Pentium's higher clock speed. In Cinebench R20 single-core, the i5-6500 scores 282 versus 179, a 57.5% lead. In Cinebench R23 single-core, it scores 672 versus 427, a 57.4% lead.

Q: What are the core and thread counts?

A: The i5-6500 has 4 cores and 4 threads. The Pentium Gold G6400 has 2 cores and 4 threads. Both support four threads total, but the i5-6500 uses four physical cores while the Pentium uses two cores with Hyper-Threading.

Q: Which processor has more L3 cache?

A: The i5-6500 has 6 MB of shared L3 cache. The Pentium Gold G6400 has 4 MB of shared L3 cache. Both have 64 KB of L1 cache per core and 256 KB of L2 cache per core.

Q: Do both processors support DDR4 memory?

A: Yes, both support DDR4 in dual-channel mode. The Pentium Gold G6400 has a higher recorded memory bandwidth at 42.7 GB/s, compared to 34.1 GB/s for the i5-6500. Neither supports ECC memory.

Where Each One Wins

The i5-6500 dominates in rendering and compute-heavy workloads. In Cinebench R15, R20, and R23, it leads by roughly 57% across both multicore and single-core tests. It also wins Passmark floating point math by 41% (12391 vs 8788) and Passmark find prime numbers by 58.8% (27 vs 17). For anyone running CPU rendering, scientific calculations, or prime-number-heavy workloads, the i5-6500 is the stronger choice.

The i5-6500 also wins in data and encryption tasks. It leads Passmark data compression by 21.8% (76510 vs 62806), data encryption by 9.3% (1678 vs 1535), and random string sorting by 16.5% (9357 vs 8034). The extended instructions gap is the largest of any test, with the i5-6500 scoring 6549 versus 1784, a 267.1% advantage. This makes the i5-6500 the clear pick for workloads that use modern CPU instruction sets.

The Pentium Gold G6400 wins in single-threaded Passmark performance. Its 2457 score beats the i5-6500's 2093 by 14.8%. This is relevant for older software, lightly threaded applications, or tasks where a single core's speed is the limiting factor. The Pentium also has a higher memory bandwidth rating (42.7 GB/s vs 34.1 GB/s) and a newer, active production status, which matters for platform longevity.

The i5-6500 wins 14 of 16 head-to-head tests, but the Pentium's two wins are in a category that many everyday tasks rely on. The practical split is simple: multi-threaded and instruction-heavy workloads go to the i5-6500, while single-thread Passmark workloads and current platform availability go to the Pentium Gold G6400.

Specification Differences

The two processors differ in several key specifications. The i5-6500 has 4 cores and 4 threads, while the Pentium Gold G6400 has 2 cores and 4 threads. The i5-6500 has a base clock of 3.20 GHz and a boost clock of 3.60 GHz. The Pentium Gold G6400 has a base clock of 4.00 GHz and no recorded boost clock.

Thermal design power differs slightly: the i5-6500 is rated at 65 W, while the Pentium Gold G6400 is rated at 58 W. The i5-6500 uses the Intel Socket 1151, and the Pentium Gold G6400 uses the Intel Socket 1200, so they are not physically interchangeable on the same motherboard.

Architecture and generation differ as well. The i5-6500 is Skylake, part of the Core i5 (Skylake) generation, released in July 2015 and now end-of-life. The Pentium Gold G6400 is Comet Lake, part of the Pentium Gold (Comet Lake) generation, released in April 2020 and still active. Both use a 14 nm process node from Intel.

Cache amounts differ in L3 only: the i5-6500 has 6 MB shared L3, and the Pentium Gold G6400 has 4 MB shared L3. L1 and L2 are identical at 64 KB per core and 256 KB per core, respectively.

Memory bandwidth favors the Pentium Gold G6400 at 42.7 GB/s versus 34.1 GB/s for the i5-6500. Both support DDR4 in dual-channel mode, and neither supports ECC memory.

Integrated graphics differ: the i5-6500 has HD Graphics 530, and the Pentium Gold G6400 has UHD Graphics 610. Both have PCIe Gen 3 with 16 lanes from the CPU only, and neither has an unlocked multiplier. The part numbers are SR2L6 for the i5-6500 and SRH3Y for the Pentium Gold G6400. The die size is 177 mm² for the i5-6500, with no die size recorded for the Pentium.