AMD Ryzen 9 3900 vs Intel Core i5-14600KF Comparison

Head-to-Head Benchmarks

The recorded data shows a decisive overall victory for the Intel Core i5-14600KF, which wins 14 of the 15 head-to-head benchmark comparisons against the AMD Ryzen 9 3900. The scale of the Intel advantage varies widely by workload, from a narrow 3.6% edge in data encryption to a staggering 134.5% lead in Cinebench R15 single-core performance.

The single-core results are the most one-sided. In Cinebench R15 single-core, the Intel part scores 462 against the AMD's 197, a 134.5% delta. Geekbench single-core tells a similar story: 2445 versus 1550, a 57.7% advantage for Intel. PassMark single-thread results show 4273 versus 2604, a 64.1% gap. These figures reflect a generational difference in per-thread performance, with the Intel architecture delivering roughly 60% or more throughput in most single-threaded tests.

Multi-core workloads also favor Intel, though by a smaller margin. Cinebench R15 multi-core gives Intel 3280 versus 2804, a 17% lead. Geekbench multi-core shows a 60.4% advantage (17085 versus 10653), which is actually larger than the R15 multi-core gap. The PassMark multithread test records 38697 for Intel against 30586 for AMD, a 26.5% delta. Floating-point math is another major win: 93048 versus 56730, a 64% advantage for Intel. Integer math follows with 125982 versus 97698, a 29% lead.

The AMD Ryzen 9 3900's sole victory comes in the PassMark find prime numbers test, where it scores 203 against Intel's 161, a 20.7% advantage for AMD. This is a notable outlier, as the test appears to favor AMD's thread scheduling or instruction handling despite the Intel part winning every other comparison. In the remaining tests, Intel's margins range from 3.6% in data encryption (27608 versus 26657) to 51.5% in physics (2449 versus 1617), with extended instructions at 10.4% (28785 versus 26073), data compression at 17.2% (485140 versus 413887), and random string sorting at 15.9% (52056 versus 44902).

Where Each One Wins

The Intel Core i5-14600KF is the clear choice for virtually every compute-heavy workload represented in the database. Its single-core dominance, with leads between 57.7% and 134.5% across three different single-thread tests, makes it the superior option for any application that depends on per-core performance, such as everyday responsiveness, lightly threaded productivity tools, and most gaming scenarios where one or two threads dominate the workload.

In multi-threaded applications, the Intel part also holds the advantage, with multi-core leads ranging from 17% in Cinebench R15 to 60.4% in Geekbench. The PassMark multithread score of 38697 versus 30586 confirms the pattern. This means the Intel chip is better suited for rendering, video encoding, and other parallel workloads, despite having fewer threads (20 versus 24). The floating-point math result is particularly strong for Intel, with a 64% advantage, indicating superior performance in scientific and engineering simulations. Integer math, which underpins many database and transactional workloads, also favors Intel by 29%.

The AMD Ryzen 9 3900 wins only the prime-number-finding benchmark. This narrow victory suggests a specific strength in integer-heavy, branch-predictable loops, but the database provides no other evidence of workloads where AMD takes the lead. For users running prime-number searches or similar mathematical sieving tasks, the AMD part may offer a slight edge, but this is an isolated result.

The architecture comparison explains part of the performance split. The Intel chip is built on a 10 nm process and uses the Raptor Lake-R architecture with a hybrid core design, while the AMD part uses TSMC's 7 nm process with Zen 2 (Matisse). The Intel part has 14 cores and 20 threads versus AMD's 12 cores and 24 threads. The thread count difference is notable: AMD offers more threads despite fewer physical cores, because each core supports two threads, whereas Intel's hybrid design has 6 performance cores with hyper-threading and 8 efficiency cores without.

Cache configurations also differ significantly. Intel provides 80 KB of L1 cache per core, 2 MB of L2 per core, and 24 MB of shared L3 cache. AMD provides 64 KB of L1 per core, 512 KB of L2 per core, and a much larger 64 MB of L3 cache. The larger L3 on AMD, combined with the smaller L1 and L2, may influence the prime-number test result, where the workload likely fits well within the larger L3.

Architecture Differences

The two processors come from different design eras and manufacturing nodes. The Intel Core i5-14600KF is a Core 14th Gen part using the Raptor Lake architecture, specifically the Raptor Lake-R refresh, fabricated on Intel's 10 nm process with a die size of 257 mm². The AMD Ryzen 9 3900 belongs to the 3000 series, uses the Zen 2 architecture with the Matisse codename, and is fabricated by TSMC on a 7 nm process with a die size of 2x 74 mm² and 7,600 million transistors.

Core counts and thread counts differ meaningfully. The Intel part has 14 cores and 20 threads, while the AMD part has 12 cores and 24 threads. This means the AMD chip offers 20% more threads, yet the Intel chip still wins the multi-threaded benchmarks, a result of the Intel architecture's higher per-core throughput and faster clock speeds. The Intel base clock is 3.50 GHz and boost clock is 5.30 GHz, compared to AMD's 3.10 GHz base and 4.30 GHz boost. The 1.0 GHz boost advantage for Intel is substantial and directly contributes to the single-core score gaps.

Memory support differs as well. The Intel part supports both DDR4 and DDR5 memory in dual-channel mode, while the AMD part supports only DDR4, also dual-channel. The AMD part has a recorded memory bandwidth of 51.2 GB/s, while the Intel part's bandwidth is not recorded in the database. ECC memory support is present on the Intel chip but absent on the AMD chip, which may matter for workstation or server users.

PCIe connectivity also differs. The Intel part provides PCIe Gen 5 with 16 lanes (CPU only), while the AMD part provides PCIe Gen 4 with 24 lanes (CPU only). The Intel part offers a newer PCIe generation for higher bandwidth per lane, though the AMD part offers more total lanes for expansion. Both chips have unlocked multipliers, allowing overclocking, and both are for the desktop market segment. The Intel chip uses Socket 1700, while the AMD chip uses Socket AM4, meaning they are not interchangeable in existing motherboards.

The thermal design power differs notably: Intel lists 125 W TDP, while AMD lists 65 W TDP. This indicates the Intel chip draws more power under load, which is consistent with its higher clock speeds and performance, but the database does not include measured power consumption to confirm the real-world impact.

The Verdict

Based strictly on the recorded benchmark data, the Intel Core i5-14600KF is the superior processor in 14 of 15 comparisons. The average benchmark score for the Intel part is 49394, placing it at the 90th percentile of all CPUs, while the AMD part averages 47918, also at the 90th percentile. The Intel chip's nearest rivals include the AMD Ryzen 9 7900 (delta 0.3%) and the AMD Ryzen AI Max+ 388 (delta -0.8%), while the AMD Ryzen 9 3900's nearest rivals include the AMD Ryzen 9 7900X3D (delta 0%) and the Intel Core Ultra 7 265T (delta 0.5%). This suggests the Intel part sits at a slightly higher performance tier than the AMD part, despite both being at the same overall percentile.

Users who prioritize single-thread performance, floating-point math, or general multi-core throughput should select the Intel Core i5-14600KF. The data shows leads of 57.7% to 134.5% in single-thread tests, 64% in floating-point math, and 17% to 60.4% in multi-thread tests. The Intel part also supports newer memory standards (DDR5 in addition to DDR4) and PCIe Gen 5, which future-proofs a system build.

Users who specifically run prime-number-finding or similar integer-sieving workloads might see a benefit from the AMD Ryzen 9 3900, which wins that test by 20.7%. Additionally, the AMD part offers more threads (24 versus 20) and a larger L3 cache (64 MB versus 24 MB), which could be relevant for specific workloads not captured in this benchmark set. The AMD part also has a much lower TDP (65 W versus 125 W), which may be a consideration for power-constrained builds, though the database does not include efficiency metrics.

For most buyers, the Intel Core i5-14600KF is the data-backed choice. Its benchmark wins are broad and decisive, and its architecture is newer, with faster clocks and modern platform features. The AMD Ryzen 9 3900 remains a capable processor, but the recorded measurements show it trailing in nearly every category.

FAQ

Q: Which processor has the higher single-core performance?

A: The Intel Core i5-14600KF. It scores 462 versus 197 in Cinebench R15 single-core (a 134.5% lead), 2445 versus 1550 in Geekbench single-core (57.7% lead), and 4273 versus 2604 in PassMark single-thread (64.1% lead).

Q: How many cores and threads does each processor have?

A: The Intel Core i5-14600KF has 14 cores and 20 threads. The AMD Ryzen 9 3900 has 12 cores and 24 threads.

Q: What is the only benchmark where the AMD Ryzen 9 3900 wins?

A: The PassMark find prime numbers test, where AMD scores 203 against Intel's 161, a 20.7% advantage for AMD.

Q: Which processor supports DDR5 memory?

A: Only the Intel Core i5-14600KF supports DDR5 memory, in addition to DDR4. The AMD Ryzen 9 3900 supports only DDR4.

Q: What is the L3 cache size difference between the two?

A: The Intel Core i5-14600KF has 24 MB of shared L3 cache. The AMD Ryzen 9 3900 has 64 MB of L3 cache.

Q: Which processor has a higher boost clock?

A: The Intel Core i5-14600KF has a boost clock of 5.30 GHz, compared to the AMD Ryzen 9 3900's boost clock of 4.30 GHz.