AMD EPYC 7261 vs Intel Core i5-8600K Comparison

Head-to-Head Benchmarks

The recorded data shows a consistent, if not overwhelming, advantage for the AMD EPYC 7261 across every benchmark in the comparison set. In all six head-to-head tests, the EPYC 7261 takes the win, with the Intel Core i5-8600K trailing by a nearly uniform margin of 9.1% in most workloads.

Starting with multi-core performance, the EPYC 7261 posts a Cinebench R15 multi-core score of 954 against the i5-8600K’s 867, a 9.1% gap. The pattern repeats in Cinebench R20 multi-core, where the EPYC scores 3979 versus 3616, again a 9.1% difference. In Cinebench R23 multi-core, the EPYC reaches 9476 while the i5-8600K manages 8611, holding the same 9.1% lead. The uniformity of this margin across three generations of Cinebench suggests a fixed performance ratio rather than workload-specific variation.

Single-core results tell a similar story, though the margins are slightly less consistent. In Cinebench R15 single-core, the EPYC scores 134 against the i5-8600K’s 122, a 9% difference. Cinebench R20 single-core sees the EPYC at 561 versus 510, a 9.1% gap, and Cinebench R23 single-core has the EPYC at 1337 against 1215, again 9.1%. The single-core advantage is notable because the i5-8600K has a much higher boost clock of 4.30 GHz compared to the EPYC’s 2.90 GHz, yet the EPYC still wins by roughly nine percent in every test.

Beyond the head-to-head set, the broader benchmark database adds context. The i5-8600K shows a Geekbench multi-core score of 5997 and a single-core score of 1514, while the EPYC 7261 has no Geekbench entries in the pack. The i5-8600K also posts an average benchmark score of 2807, placing it in the 51st percentile of all CPUs. The EPYC 7261 has an average score of 2740, landing in the 50th percentile. Despite losing every head-to-head test, the i5-8600K’s average score is slightly higher, a quirk driven by its Geekbench results being included in its average while the EPYC’s average relies solely on Cinebench runs.

The nearest rival data reinforces how close these two parts are in overall standing. The i5-8600K sits near the Intel Atom x7211RE (average score 2811, 0.1% ahead), the Intel Core i5-11300H (2792, 0.6% behind), the Intel Xeon E-2324G (2823, 0.6% behind), and the Intel Xeon E5-4627 v3 (2789, 0.7% behind). The EPYC 7261 sits near the Intel Xeon E-2176M (2751, 0.4% behind), the Intel Xeon E5-2628L v3 (2724, 0.6% ahead), the AMD Ryzen 7 4700U (2722, 0.7% ahead), and the AMD Ryzen 3 4300GE (2759, 0.7% behind). Both processors are effectively clustered with mid-range parts from several generations, and their overall percentile ranks (51st versus 50th) are statistically indistinguishable.

FAQ

Q: Which processor wins the most head-to-head benchmark tests?

A: The AMD EPYC 7261 wins all six head-to-head tests, covering Cinebench R15, R20, and R23 in both multi-core and single-core modes.

Q: How large is the performance gap in multi-core workloads?

A: The EPYC 7261 leads by 9.1% in Cinebench R15 multi-core (954 versus 867), Cinebench R20 multi-core (3979 versus 3616), and Cinebench R23 multi-core (9476 versus 8611).

Q: Does the Intel Core i5-8600K win any benchmark in the comparison set?

A: No. The recorded data shows zero wins for the i5-8600K in the head-to-head benchmark set, although its average benchmark score of 2807 is higher than the EPYC’s 2740 due to additional Geekbench scores.

Q: How do the two processors compare in overall CPU percentile rankings?

A: The i5-8600K sits in the 51st percentile of all CPUs, while the EPYC 7261 sits in the 50th percentile, making them effectively tied in overall standing despite the EPYC’s consistent head-to-head wins.

Q: What is the difference in single-core performance?

A: The EPYC 7261 leads by 9% in Cinebench R15 single-core (134 versus 122) and by 9.1% in both Cinebench R20 single-core (561 versus 510) and Cinebench R23 single-core (1337 versus 1215).

Q: Are both processors unlocked for overclocking?

A: Yes, both the Intel Core i5-8600K and the AMD EPYC 7261 have an unlocked multiplier.

Architecture Differences

The two processors come from fundamentally different design philosophies. The Intel Core i5-8600K uses the Coffee Lake architecture on a 14 nm process manufactured by Intel. It is a desktop part with 6 cores and 6 threads, meaning no simultaneous multithreading. The AMD EPYC 7261 uses the Zen architecture under the codename Naples, also on a 14 nm process, but manufactured by GlobalFoundries. It is a server and workstation part with 8 cores and 16 threads, leveraging simultaneous multithreading to double thread count.

Cache layouts differ substantially. The i5-8600K has 64 KB of L1 cache per core, 256 KB of L2 per core, and 9 MB of shared L3 cache. The EPYC 7261 has 96 KB of L1 per core, 512 KB of L2 per core, and 32 MB of shared L3 cache. The EPYC’s L3 cache is more than three times larger, and its per-core L1 and L2 caches are also larger, which helps compensate for its lower clock speeds.

The memory subsystems are in different leagues. The i5-8600K supports DDR4 over a dual-channel bus with a memory bandwidth of 42.7 GB/s and no ECC support. The EPYC 7261 supports DDR4 over an eight-channel bus with a memory bandwidth of 170.6 GB/s and full ECC support. That is a fourfold increase in memory channels and a bandwidth advantage of roughly 128 GB/s, a critical factor for server workloads that the benchmark scores do not fully capture.

PCIe and graphics also diverge. The i5-8600K offers PCIe Gen 3 with 16 lanes from the CPU and includes integrated UHD Graphics 630. The EPYC 7261 offers PCIe Gen 3 but with no lane count specified in the data, and it has no integrated graphics at all. The i5-8600K therefore carries a full iGPU for systems without a discrete graphics card, while the EPYC assumes a server environment with dedicated hardware.

Physical and production details differ as well. The EPYC 7261 is built from 4,800 million transistors on a 213 mm² die, while the i5-8600K has no transistor count or die size recorded. The EPYC uses AMD Socket SP3, the i5-8600K uses Intel Socket 1151. The EPYC is part of the EPYC 7001 series and remains in active production, while the i5-8600K is marked as end-of-life.

Specification Differences

The core and thread counts are a clear differentiator: the i5-8600K has 6 cores and 6 threads, while the EPYC 7261 has 8 cores and 16 threads. Clock speeds favor Intel, with the i5-8600K running at 3.60 GHz base and 4.30 GHz boost versus the EPYC’s 2.50 GHz base and 2.90 GHz boost. Thermal design power favors Intel as well, with the i5-8600K rated at 95 watts compared to the EPYC’s 170 watts.

Memory channels and bandwidth heavily favor AMD, with eight channels and 170.6 GB/s versus dual-channel and 42.7 GB/s. ECC support is present only on the EPYC. L3 cache is 9 MB on the i5-8600K versus 32 MB on the EPYC. L1 and L2 per-core caches are larger on the EPYC as well.

The sockets are incompatible: Intel Socket 1151 for the i5-8600K and AMD Socket SP3 for the EPYC 7261. The i5-8600K has integrated graphics, the EPYC does not. The i5-8600K has a recorded launch MSRP of $257, while the EPYC has no launch MSRP recorded. The i5-8600K was released on October 4, 2017, while the EPYC followed on June 13, 2018. Both have unlocked multipliers.

The Verdict

The data points to a clear winner in raw compute performance: the AMD EPYC 7261 takes every head-to-head benchmark by roughly 9%, and it does so despite a much lower boost clock. The 8-core, 16-thread configuration with 32 MB of L3 cache and eight-channel memory is a structurally stronger platform for sustained multi-threaded work. The i5-8600K’s advantage lies in its higher clocks, lower power draw, integrated graphics, and lower launch MSRP, but none of those translate into a benchmark win in the recorded set.

For buyers choosing between these two, the decision hinges on context rather than raw scores. The EPYC 7261 is the better choice for server or workstation deployments where ECC memory, massive memory bandwidth, and 16 threads matter more than clock speed. The i5-8600K is the better choice for a desktop build where integrated graphics, a 95 watt TDP, and a lower launch MSRP are priorities, and where the 9% performance deficit is acceptable. The overall percentile rankings, 51st for Intel and 50th for AMD, suggest these are closely matched parts in the broader CPU landscape, but the head-to-head results are unambiguous in favor of the EPYC.

Where Each One Wins

The AMD EPYC 7261 wins in every measured performance category: Cinebench R15, R20, and R23 in both single-core and multi-core modes. Its strengths are most pronounced in multi-threaded server workloads where 16 threads, 32 MB of L3 cache, and 170.6 GB/s of memory bandwidth can be fully utilized. The 9.1% multi-core lead in R23 (9476 versus 8611) is a meaningful margin for rendering, compiling, or virtualized workloads that scale with thread count. Its ECC memory support and eight-channel memory bus make it the only viable choice among these two for reliability-critical or memory-bandwidth-hungry environments.

The Intel Core i5-8600K wins in areas outside the benchmark suite. Its 4.30 GHz boost clock and 95 watt TDP make it more efficient per watt, and its integrated UHD Graphics 630 means a system can run without a discrete GPU. The lower launch MSRP of $257 makes it the more accessible desktop option. Its 42.7 GB/s memory bandwidth and dual-channel bus are sufficient for typical desktop tasks, and its 6 cores at high clocks are well suited to lightly threaded applications where the EPYC’s lower clock speed would hurt. The i5-8600K also benefits from a larger body of Geekbench results in the database, with a multi-core score of 5997 and a single-core score of 1514, though no direct Geekbench comparison with the EPYC is recorded.

In short, the EPYC 7261 is the performance pick in every head-to-head test, while the i5-8600K is the pragmatic pick for desktop use, where its higher clocks, lower power, integrated graphics, and lower launch price carry more weight than a 9% benchmark deficit.