AMD Ryzen 5 5500U vs Intel Core i5-9600K Comparison

The Intel Core i5-9600K and AMD Ryzen 5 5500U end up as statistical twins in the aggregate, with average benchmark scores of 14605 and 14589 respectively — a 0.1% gap that places both at the 69th percentile of all CPUs. Yet this near-deadlock masks a stark functional split: the desktop 9600K wins 9 of 17 head-to-head tests, while the mobile 5500U takes 8, but the victories come in entirely different workload families. The data shows a clear verdict: the 9600K is the single-thread and legacy-rendering champion, while the 5500U dominates multi-threaded integer, encryption, and compression workloads.

Where Each One Wins

The Intel Core i5-9600K claims its wins through raw per-core strength and older benchmark suites. It leads in Cinebench R23 multi-core by 26% (9055 vs 7186) and single-core by 9% (1278 vs 1172), plus Geekbench multi-core by 22.4% (6075 vs 4965) and single-core by 20.7% (1559 vs 1292). The pattern extends to PassMark physics, where it posts a 40% advantage (746 vs 533), and prime number finding, where it leads by 65.4% (43 vs 26). Single-threaded PassMark also favors Intel by 12.7% (2727 vs 2419), as does extended instructions by 19.2% (12914 vs 10838).

The AMD Ryzen 5 5500U wins through thread parallelism and specialized math. Its most striking victory is data encryption, where it scores 10405 versus Intel's 3269 — a 68.6% margin. Integer math shows a 35.4% lead (45258 vs 29215), and multithreaded PassMark gives it a 17.1% edge (12831 vs 10636). Data compression favors AMD by 14.9% (174584 vs 148639), while floating-point math (26029 vs 24913) and random string sorting (19035 vs 18313) are narrower wins at 4.3% and 3.8% respectively. In Cinebench R15, the 5500U wins both multi-core (1247 vs 912, 26.9% ahead) and single-core (177 vs 128, 27.7% ahead), an interesting reversal from R23 results.

Architecture Differences

The two chips come from opposite design philosophies. The 9600K is a 14 nm Intel Coffee Lake part built for desktops, running at a 3.70 GHz base and 4.60 GHz boost with a 95 W TDP. It uses the Intel Socket 1151, pairs with DDR4 memory over a dual-channel bus at 42.7 GB/s, and exposes 16 PCIe Gen 3 lanes from the CPU. Its six cores run six threads — no simultaneous multithreading — and it carries 9 MB of shared L3 cache, with 64 KB L1 and 256 KB L2 per core. The chip has an unlocked multiplier and integrates UHD 630 graphics.

The 5500U is a 7 nm TSMC-built Zen 2 mobile processor from the 5000 series, codenamed Lucienne. It sits in AMD Socket FP6 with a 15 W TDP, running at 2.10 GHz base and 4.00 GHz boost. Crucially, it offers six cores and twelve threads via SMT, backed by 8 MB shared L3 and 512 KB L2 per core (double Intel's per-core L2). Its memory bandwidth is higher at 51.2 GB/s, but PCIe is limited to 12 Gen 3 lanes. The die contains 9,800 million transistors on 156 mm², and the multiplier is locked. Integrated graphics are Radeon Graphics with 448 SP. The 5500U also has a 3DMark thread-scaling suite (single: 684, 2-thread: 1354, 4-thread: 2446, 8-thread: 3259, 16-thread: 3741, max: 3643) that the 9600K lacks entirely.

Head-to-Head Benchmarks

The biggest Intel wins come in Cinebench R23 multi-core, where the 9600K scores 9055 against 7186 — a 26% margin that reverses the R15 result. Cinebench R15 multi-core shows the opposite: AMD wins 1247 to 912, a 26.9% lead. This discrepancy suggests the newer R23 workload favors the 9600K's higher boost clock and lower latency, while R15 rewards the 5500U's extra threads. Geekbench multi-core gives Intel a 22.4% edge (6075 vs 4965), and single-core follows at 20.7% (1559 vs 1292). PassMark physics is lopsided at 40% (746 vs 533), and prime number finding at 65.4% (43 vs 26), indicating Intel's integer-heavy scalar work is far more efficient per thread.

AMD's counterattack is led by data encryption, where 10405 dwarfs 3269 — a 68.6% gap that no other test approaches. Integer math shows 45258 vs 29215 (35.4% lead), and multithreaded PassMark gives 12831 vs 10636 (17.1% lead). Data compression goes AMD's way at 174584 vs 148639 (14.9%), while floating-point math (26029 vs 24913) and random string sorting (19035 vs 18313) are closer at 4.3% and 3.8%. Cinebench R15 single-core is AMD's smallest but still decisive, 177 vs 128 (27.7%), which is surprising given Intel's single-thread wins elsewhere — the old R15 test clearly rewards AMD's Zen 2 front-end design.

FAQ

Q: Which CPU has the higher average benchmark score?

A: The Intel Core i5-9600K has an average benchmark score of 14605, while the AMD Ryzen 5 5500U scores 14589 — a 0.1% difference making them effectively tied.

Q: How many head-to-head tests does each chip win?

A: The 9600K wins 9 tests, and the 5500U wins 8 tests, out of 17 shared benchmarks.

Q: Which processor is better for encryption workloads?

A: The AMD Ryzen 5 5500U is vastly superior in data encryption, scoring 10405 versus the 9600K's 3269 — a 68.6% advantage.

Q: Does the 5500U have more threads than the 9600K?

A: Yes, the 5500U has 12 threads from 6 cores via SMT, whereas the 9600K has 6 threads from 6 cores with no multithreading.

Q: Which chip has the higher boost clock?

A: The Intel Core i5-9600K boosts to 4.60 GHz, compared to the 5500U's 4.00 GHz boost clock.

Q: Are both CPUs at the same performance percentile?

A: Yes, both are at the 69th percentile of all CPUs, reinforcing their near-identical aggregate performance.

Specification Differences

The two processors differ on nearly every physical and feature specification. The 9600K uses a 14 nm process from Intel, while the 5500U uses 7 nm from TSMC. Core counts match at 6, but threads differ: 6 for Intel versus 12 for AMD. Base clocks are 3.70 GHz versus 2.10 GHz, and boost clocks are 4.60 GHz versus 4.00 GHz. TDP is dramatically different — 95 W for the desktop part versus 15 W for the mobile part. Sockets differ (Intel Socket 1151 vs AMD Socket FP6), as do architectures (Coffee Lake vs Zen 2 Lucienne). The 5500U has 9,800 million transistors on 156 mm², while the 9600K has no listed transistor or die size data. L2 cache is 256 KB per core on Intel versus 512 KB per core on AMD, and L3 is 9 MB shared versus 8 MB shared. Memory bandwidth is 42.7 GB/s versus 51.2 GB/s. PCIe lanes are 16 versus 12, both Gen 3. Integrated graphics are UHD 630 versus Radeon Graphics 448SP. The 9600K has an unlocked multiplier; the 5500U does not. Release dates are October 2018 versus January 2021. The 9600K is end-of-life; the 5500U is active. Neither supports ECC memory.

The Verdict

The data supports a clear split: pick the Intel Core i5-9600K for single-threaded performance, legacy Cinebench R23 rendering, and physics simulation. It wins Cinebench R23 multi-core by 26%, Geekbench multi-core by 22.4%, and PassMark physics by 40%, making it the stronger choice for applications that scale on high clock speeds and low thread latency. Its single-thread leads of 9% in R23, 20.7% in Geekbench, and 12.7% in PassMark further cement its position for everyday responsiveness and lightly threaded software.

Pick the AMD Ryzen 5 5500U for encryption, integer math, and threaded utility work. Its 68.6% encryption lead is the single largest margin in the comparison, and the 35.4% integer math advantage plus 17.1% multithreaded PassMark win show where SMT pays off. The 5500U also wins data compression by 14.9% and floating-point math by 4.3%, making it the better all-rounder for productivity suites that use many threads. The 15 W TDP also makes it the only viable choice for mobile systems, while the 9600K's 95 W envelope is desktop-only. Both sit at the 69th percentile, so the tiebreaker is workload, not overall capability.