Intel Core i5-10400 vs Intel Core i5-9500 Comparison

Head-to-Head Benchmarks

The Intel Core i5-10400 and Intel Core i5-9500 share the same six physical cores, but the 10400 adds Hyper-Threading, giving it 12 threads versus 6. That difference dominates the head-to-head results. Across the recorded benchmarks, the i5-10400 wins 14 tests while the i5-9500 wins 5.

The largest victory for the i5-10400 comes in PassMark integer math, where it scores 41715 against 27574, a 51.3% advantage. That is a massive gap for two CPUs with identical core counts and the same 4.30 GHz boost clock. The reason is clear: integer workloads scale heavily with thread count, and the 10400 has twice the threads. Similarly, PassMark data compression shows a 37.4% lead (187207 vs 136283), and random string sorting also lands at 37.4% (23206 vs 16894). Data encryption follows at 30.5% (4078 vs 3125). These are all workloads that can use every available thread, and the 10400 simply has more of them.

Multithreaded rendering follows the same pattern. In Cinebench R23 multicore, the i5-10400 scores 8316 versus 7705, a 7.9% lead. Cinebench R20 multicore shows 3492 vs 3236, also 7.9%. Cinebench R15 multicore is 838 vs 776, an 8% gap. PassMark multithread shows a larger 22.2% advantage (12006 vs 9826), likely because that test mixes workloads that benefit unevenly from extra threads. PassMark physics (669 vs 619) and floating point math (26080 vs 23788) add wins of 8.1% and 9.6%, respectively.

Single-core results are much closer. The i5-10400 wins all three Cinebench single-core tests: R15 at 118 vs 109 (8.3%), R20 at 493 vs 456 (8.1%), and R23 at 1174 vs 1087 (8%). These are consistent margins, likely from the newer Comet Lake architecture rather than clock speed, since both CPUs boost to 4.30 GHz. However, PassMark single-thread tells a different story: the i5-9500 edges ahead at 2565 vs 2560, a 0.2% difference. That is effectively a tie, but the i5-9500 takes the win on the database record.

Geekbench is the surprise. The i5-9500 wins Geekbench multicore 5402 vs 4790, an 11.3% margin, and Geekbench singlecore 1448 vs 1108, a 23.5% margin. These results run opposite to every other benchmark in the comparison. The single-core gap is especially strange given that the i5-10400 wins all Cinebench single-core tests. Geekbench versions and workload mix can vary, but the recorded data shows the i5-9500 clearly ahead here. PassMark find prime numbers also goes to the i5-9500, 36 vs 34, a 5.6% edge.

Where Each One Wins

The i5-10400 is the clear choice for heavily threaded work. Any workload that scales with thread count favors it: integer math, encryption, compression, sorting, physics simulation, and multithreaded rendering. The 51.3% lead in integer math and 37.4% leads in compression and sorting show that the extra threads are not a small bonus; they are transformative for these tasks. If the workload can use 12 threads, the 10400 is simply in a different class.

The i5-9500 wins in Geekbench tests and by a hair in PassMark single-thread. The Geekbench singlecore result (1448 vs 1108) is the largest margin in either direction, but it contradicts the Cinebench single-core results, where the 10400 wins by 8%. Treat that as a workload-specific anomaly. The i5-9500 also wins PassMark find prime numbers, which is a lightweight single-threaded test. For everyday single-threaded responsiveness, the two CPUs are effectively equal: the PassMark single-thread scores differ by 0.2%.

For mixed productivity, the i5-10400 wins PassMark multithread by 22.2%, which is a better indicator of general multitasking than any single-core test. The i5-9500 is not a slow CPU, but its 6 threads limit it in any scenario where background tasks compete with foreground work.

Architecture Differences

Both CPUs are built on Intel's 14 nm process, but they belong to different generations. The i5-10400 uses Comet Lake architecture on the Intel Socket 1200 platform. The i5-9500 uses Coffee Lake (specifically Coffee Lake Refresh) on Intel Socket 1151. Neither CPU has an unlocked multiplier, so overclocking is not an option for either.

The core counts match at 6, but the i5-10400 doubles the thread count to 12 through Hyper-Threading. The i5-9500 runs 6 threads with no SMT. The i5-10400 also has a larger shared L3 cache: 12 MB versus 9 MB. Both CPUs have 64 KB of L1 per core and 256 KB of L2 per core. The larger L3 cache on the 10400 likely contributes to its consistent Cinebench single-core wins, even though both CPUs boost to the same 4.30 GHz.

Integrated graphics are similar: UHD Graphics 630 on the i5-10400 and UHD 630 on the i5-9500. Both support DDR4 memory over a dual-channel bus with 42.7 GB/s bandwidth, and neither supports ECC memory. Both use PCIe Gen 3 with 16 CPU lanes. The i5-10400 has a base clock of 2.90 GHz, while the i5-9500 has a slightly higher 3.00 GHz base clock, but both boost to 4.30 GHz.

The production status differs: the i5-10400 is listed as Active, while the i5-9500 is End-of-life. Release dates in the database show the i5-9500 launching in October 2018 and the i5-10400 in April 2020.

Specification Differences

| Specification | Intel Core i5-10400 | Intel Core i5-9500 |

|---|---|---|

| Threads | 12 | 6 |

| Base clock | 2.90 GHz | 3.00 GHz |

| Socket | Intel Socket 1200 | Intel Socket 1151 |

| Architecture | Comet Lake | Coffee Lake |

| Generation | Core i5 (Comet Lake) | Core i5 (Coffee Lake Refresh) |

| L3 cache | 12 MB (shared) | 9 MB (shared) |

| Production status | Active | End-of-life |

| Release date | 2020-04-29 | 2018-10-18 |

Both CPUs share the same 6 cores, 65 W TDP, 4.30 GHz boost clock, 14 nm process, DDR4 dual-channel memory support, 42.7 GB/s memory bandwidth, PCIe Gen 3 with 16 lanes, UHD 630 integrated graphics, and lack of ECC support. Neither has an unlocked multiplier.

FAQ

Q: Which CPU is faster in multithreaded workloads?

A: The Intel Core i5-10400. It wins Cinebench R23 multicore by 7.9%, PassMark multithread by 22.2%, PassMark integer math by 51.3%, and PassMark data compression by 37.4%. The extra 6 threads make the difference.

Q: Is the i5-9500 faster in any benchmark?

A: Yes. It wins Geekbench multicore by 11.3% and Geekbench singlecore by 23.5%. It also edges out the i5-10400 in PassMark single-thread by 0.2% and PassMark find prime numbers by 5.6%.

Q: Do both CPUs have the same boost clock?

A: Yes, both boost to 4.30 GHz. The i5-9500 has a higher base clock at 3.00 GHz versus 2.90 GHz on the i5-10400.

Q: Do these CPUs use the same motherboard socket?

A: No. The i5-10400 uses Intel Socket 1200, while the i5-9500 uses Intel Socket 1151. They are not interchangeable.

Q: Which CPU has more cache?

A: The i5-10400 has 12 MB of shared L3 cache, while the i5-9500 has 9 MB. Both have 64 KB of L1 and 256 KB of L2 per core.

Q: Are these CPUs overclockable?

A: No. Neither has an unlocked multiplier, so both run at their stock clock settings.

The Verdict

The data points to the Intel Core i5-10400 for almost any use case. It wins 14 of 19 head-to-head benchmarks, including every Cinebench test and the majority of PassMark tests. The 6 extra threads give it a decisive edge in threaded workloads, and the larger 12 MB L3 cache helps it win single-core Cinebench tests despite matching the i5-9500's 4.30 GHz boost clock. The 51.3% lead in integer math and 37.4% leads in compression and sorting are not marginal improvements; they are generational jumps in capability.

The i5-9500 is not without merit. Its Geekbench wins are substantial, and its PassMark single-thread score is essentially tied with the 10400. For a user who only runs lightly threaded applications and never pushes the CPU with multi-core workloads, the i5-9500 would be adequate. But the i5-9500 is also End-of-life, while the i5-10400 remains Active in the database.

The i5-10400 is the safer recommendation. It matches the i5-9500 in single-thread performance where it matters, wins all rendering benchmarks, and demolishes the i5-9500 in threaded productivity. The i5-9500 only makes sense if the Geekbench results align with the user's specific software, or if the user already owns a Socket 1151 motherboard. For a new build, the i5-10400's 12 threads, larger cache, and newer platform make it the clear pick from the recorded data.