AMD Ryzen 7 5800 vs Intel Core i9-9900K Comparison

The AMD Ryzen 7 5800 and the Intel Core i9-9900K are both 8-core, 16-thread desktop processors, and the database places them in the same overall percentile (79th against all recorded CPUs), yet the recorded results tell a one-sided competitive story. The Ryzen 7 5800 wins 16 of 17 head-to-head benchmarks, often by double-digit margins, while the Core i9-9900K takes a single test by a modest gap. The following analysis breaks down where that gap comes from, starting with the questions buyers most often ask.

FAQ

Q: Which CPU is faster overall?

A: The AMD Ryzen 7 5800. It wins 16 of 17 recorded head-to-head benchmarks, including every Cinebench test by roughly 43% and the PassMark multithread test by 42.3%. Its average benchmark score of 27535 also edges out the i9-9900K's 27097.

Q: Is the Ryzen 7 5800 better for single-threaded work?

A: Yes. It scores 3393 in PassMark single-thread versus 2919 for the i9-9900K, a 16.2% advantage, and it leads Cinebench R23 single-core 3099 to 2164, a 43.2% gap. The i9-9900K's higher boost clock does not translate into higher single-core scores in the recorded data.

Q: Does either chip include integrated graphics?

A: Only the Intel Core i9-9900K, which carries UHD Graphics 630. The Ryzen 7 5800 has no integrated graphics listed in the database, so it requires a discrete graphics card.

Q: Which processor is more power efficient?

A: The Ryzen 7 5800 has a 65 W TDP versus 95 W for the i9-9900K, while still delivering the higher scores across nearly every test. It also runs on a 7 nm TSMC process compared to Intel's 14 nm node.

Q: Are both CPUs still in production?

A: No. The Ryzen 7 5800 is listed as Active, while the Core i9-9900K is listed as End-of-life.

Q: How do these two compare to other CPUs in the database?

A: Both sit in the 79th percentile versus all CPUs. The Ryzen 7 5800's nearest rivals include the Intel Core i5-12600K, the AMD Ryzen 7 5700X, and the AMD Ryzen 5 7600X, all within 0.4% of its average score. The i9-9900K's nearest rivals include the AMD Ryzen 7 5700G, the Intel Core i5-14400T, the AMD Ryzen AI 7 445, and the Intel Core i7-1370P, all within 0.7%.

Architecture Differences

These processors belong to different technology eras despite the identical 8-core, 16-thread configuration. The Ryzen 7 5800 is a Zen 3 (Vermeer) design fabricated on TSMC's 7 nm process, packing 4,150 million transistors into a 74 mm² die. The Core i9-9900K is a Coffee Lake-R design on Intel's 14 nm process with a much larger 180.3 mm² die and no transistor count recorded.

Cache is a major architectural divider. Both chips have 64 KB of L1 per core, but the Ryzen doubles the L2 allocation at 512 KB per core versus 256 KB per core, and doubles the shared L3 at 32 MB versus 16 MB. That 32 MB unified L3 is a defining Zen 3 feature and a plausible contributor to the sustained rendering leads recorded in the database.

Platform capabilities also diverge. The Ryzen offers PCIe Gen 4 with 20 CPU lanes against PCIe Gen 3 with 16 CPU lanes on the Intel part, giving the AMD platform more headroom for modern storage and graphics. Memory support is DDR4 dual-channel on both, but the Ryzen records 51.2 GB/s of bandwidth versus 42.7 GB/s, and it additionally supports ECC memory, which the i9-9900K does not. The one Intel advantage here is the integrated UHD Graphics 630, absent on the AMD part. Both CPUs have unlocked multipliers.

Head-to-Head Benchmarks

The Cinebench sweep is the headline result. The Ryzen 7 5800 posts 2212 versus 1545 in Cinebench R15 multi-core (43.2% ahead), 9220 versus 6439 in R20 multi-core (43.2%), and 21953 versus 15333 in R23 multi-core (43.2%). Single-core results mirror this almost exactly: 312 to 217 in R15, 1301 to 908 in R20, and 3099 to 2164 in R23, all roughly 43% in AMD's favor. Notably, the percentage gap is essentially identical in single- and multi-threaded rendering, indicating a pure per-core throughput advantage rather than a threading or scheduling effect.

PassMark results are more varied but still dominated by the Ryzen. In PassMark multithread the Ryzen scores 25823 against 18153, a 42.3% lead consistent with the Cinebench data. Single-thread goes to AMD 3393 to 2919, a 16.2% gap. Integer math favors the Ryzen 92843 to 66134 (40.4%), floating point math 51588 to 41036 (25.7%), and physics 1141 to 934 (22.2%).

Two results stand out sharply. Data encryption is the most lopsided test in the set: 20021 for the Ryzen against 6430 for the i9-9900K, a 211.4% difference, suggesting workload-specific strengths in the Zen 3 pipeline. Prime number finding is similarly extreme at 110 versus 47, a 134% gap. More moderate wins appear in extended instructions (21297 to 18965, 12.3%) and data compression (316429 to 283506, 11.6%).

The Intel chip's sole win is random string sorting, where it scores 36238 against 32998, an 8.9% advantage. This is the only recorded test where the Coffee Lake part finishes ahead, and the margin is far smaller than the deficits elsewhere.

The Verdict

The data leaves little ambiguity. For rendering, encoding, integer and floating point compute, physics simulation, and general multithreaded throughput, the Ryzen 7 5800 is the stronger processor in every recorded category, usually by 40% or more in rendering workloads. It delivers these results at a 65 W TDP versus the Intel chip's 95 W, a meaningful efficiency gap given the performance lead.

The i9-9900K's case rests on two points in the database. First, its UHD Graphics 630 integrated graphics allow operation without a discrete card, useful for troubleshooting or basic display output. Second, its single win in random string sorting shows the Coffee Lake design retains an edge in at least one memory-adjacent workload. Buyers already on Socket 1151 who cannot change platforms might also weigh it for compatibility reasons, though that consideration sits outside the benchmark data itself.

For everyone else, including single-threaded workloads where the Ryzen leads 16.2% in PassMark and 43.2% in Cinebench R23, the AMD option is the clear choice from the measurements. The Core i9-9900K launched at a $488 MSRP and is now end-of-life; the Ryzen 7 5800 remains in active production on the AM4 platform with newer platform features. The 79th percentile placement both CPUs share flatters the Intel part, since the average scores sit close (27535 versus 27097) while the individual benchmark results diverge heavily in AMD's favor.

Specification Differences

• Architecture: Zen 3 (Vermeer) versus Coffee Lake (Coffee Lake-R)
• Process node: 7 nm (TSMC) versus 14 nm (Intel)
• Base clock: 3.40 GHz versus 3.60 GHz
• Boost clock: 4.60 GHz versus 5.00 GHz
• TDP: 65 W versus 95 W
• Socket: AMD Socket AM4 versus Intel Socket 1151
• L2 cache: 512 KB per core versus 256 KB per core
• L3 cache: 32 MB shared versus 16 MB shared
• Transistors: 4,150 million versus not recorded
• Die size: 74 mm² versus 180.3 mm²
• Memory bandwidth: 51.2 GB/s versus 42.7 GB/s
• ECC support: Yes versus No
• PCIe: Gen 4, 20 CPU lanes versus Gen 3, 16 CPU lanes
• Integrated graphics: None versus UHD Graphics 630
• Production status: Active versus End-of-life
• Release date: January 2021 versus October 2018
• Launch MSRP: Not recorded versus $488

Cores (8), threads (16), L1 cache (64 KB per core), memory support (DDR4), dual-channel memory bus, desktop segment, and unlocked multiplier are identical on both parts.