Intel Core i5-9600 vs Intel Xeon E3-1285 v6 Comparison

The Intel Core i5-9600 and the Intel Xeon E3-1285 v6 are two very different interpretations of the same socket, pitting a six-core desktop part against a four-core, eight-thread workstation part. Both land at the 48th percentile of all CPUs, and their average benchmark scores sit within a hair of each other, with the i5-9600 averaging 2354 and the Xeon E3-1285 v6 averaging 2348. The i5-9600 edges ahead by 0.3% in this aggregate, but the real story is how each achieves that near-identical result through a completely different internal configuration. The Xeon brings Hyper-Threading and a higher base clock, while the i5 brings two additional physical cores and a larger shared cache. Benchmark results show the i5-9600 winning all six head-to-head Cinebench comparisons, though the margins are consistently razor-thin.

FAQ

Q: Which processor has more physical cores?

A: The Intel Core i5-9600 has six physical cores, while the Intel Xeon E3-1285 v6 has four physical cores. The i5-9600 does not support Hyper-Threading, so it also has six threads total, whereas the Xeon E3-1285 v6 supports eight threads via Hyper-Threading.

Q: How do their average benchmark scores compare?

A: The Core i5-9600 has an average benchmark score of 2354, and the Xeon E3-1285 v6 has an average benchmark score of 2348. This gives the i5-9600 a 0.3% lead over its rival in aggregate performance across the tested workload suite.

Q: What is the difference in their boost clocks?

A: Both processors share the same 4.50 GHz boost clock. However, their base clocks differ significantly, with the Xeon E3-1285 v6 starting at 4.10 GHz and the Core i5-9600 starting at 3.10 GHz.

Q: Do both CPUs support ECC memory?

A: No. The Intel Xeon E3-1285 v6 supports ECC memory, while the Intel Core i5-9600 does not. This is a key differentiator for users requiring error-correcting memory in workstation or server builds.

Q: Which processor has a larger L3 cache?

A: The Intel Core i5-9600 has 9 MB of shared L3 cache, whereas the Intel Xeon E3-1285 v6 has 8 MB of shared L3 cache. The i5-9600 also has the advantage in total physical cores, but the Xeon has a higher base clock.

Q: Are there any Cinebench tests where the Xeon wins?

A: No. The head-to-head benchmark data shows the Intel Core i5-9600 winning all six tests, including both multicore and singlecore runs across Cinebench R15, R20, and R23. The Xeon's largest deficit is 0.3% in the multicore tests.

Architecture Differences

The fundamental architectural split here is between Coffee Lake and Kaby Lake. The Intel Core i5-9600 is built on the Coffee Lake architecture, specifically part of the Core i5 Coffee Lake Refresh generation, while the Intel Xeon E3-1285 v6 uses the Kaby Lake architecture, belonging to the Kaby Lake-DT generation. Both parts are manufactured on Intel's 14 nm process node, but the Xeon E3-1285 v6 is the older release, having launched on 2017-07-31, whereas the i5-9600 followed later on 2018-10-18.

The core configuration is the most prominent difference. The i5-9600 packs six physical cores and six threads, relying on raw core count without simultaneous multithreading. The Xeon E3-1285 v6 instead offers four physical cores and eight threads, using Hyper-Threading to double its thread count. This means the Xeon has a higher base clock of 4.10 GHz compared to the i5-9600's 3.10 GHz, though both share the same 4.50 GHz boost clock. The Xeon also has a higher TDP of 79 watts versus the i5-9600's 65 watts, reflecting the higher sustained clock baseline.

Cache hierarchies differ as well. Both processors use 64 KB of L1 cache per core and 256 KB of L2 cache per core, but the shared L3 cache is larger on the i5-9600 at 9 MB versus 8 MB on the Xeon. The Xeon E3-1285 v6 has documented transistor count and die size figures of 1,400 million transistors and 160 mm², while those metrics are not listed for the i5-9600. The integrated graphics also differ, with the i5-9600 featuring UHD 630 and the Xeon E3-1285 v6 featuring HD Graphics P630.

ECC memory support is a hard architectural boundary. The Xeon E3-1285 v6 supports ECC memory, a hallmark of its Server/Workstation market segment, while the i5-9600 does not, reflecting its Desktop market segment. Both processors use the Intel Socket 1151, support DDR4 memory in dual-channel configuration, and provide Gen 3 PCIe with 16 lanes (CPU only). The i5-9600 has a documented memory bandwidth of 42.7 GB/s, while that figure is not listed for the Xeon E3-1285 v6.

Where Each One Wins

The Core i5-9600 wins every benchmark test in the head-to-head comparison, but the margins are so small that the practical victory is more about consistency than dominance. In Cinebench R23 multicore, the i5-9600 scores 8141 against the Xeon's 8119, a 0.3% advantage. The singlecore result is similarly tight, with the i5-9600 at 1149 and the Xeon at 1146. This pattern holds across the older Cinebench versions as well, with the i5-9600 taking R20 multicore by 0.3% (3419 vs 3409) and R15 multicore by 0.2% (820 vs 818).

The Xeon E3-1285 v6's best case is in situations where its higher base clock and Hyper-Threading can compensate for fewer physical cores. Its 4.10 GHz base clock is a full 1.00 GHz higher than the i5-9600's 3.10 GHz, which helps it stay competitive in lightly threaded workloads despite the core deficit. However, the data shows that even in singlecore tests, the i5-9600 still edges ahead, albeit by just 0.2% to 0.3% in R20 and R23 singlecore.

For users prioritizing ECC memory support, the Xeon E3-1285 v6 is the only choice between the two. The i5-9600 cannot be used in systems that require error-correcting memory, making the Xeon the clear winner for workstation reliability scenarios. The Xeon also carries the Server/Workstation market segment designation, while the i5-9600 is explicitly a Desktop part, which may matter for platform qualification in enterprise environments.

The i5-9600 wins on raw core count and cache capacity, offering six cores and 9 MB of L3 cache versus the Xeon's four cores and 8 MB. For workloads that scale with physical cores and cache size, such as heavily threaded rendering tasks, the i5-9600's architecture provides a structural advantage, even if the benchmark deltas are minimal. The i5-9600 also has a lower TDP of 65 watts versus 79 watts, which can be relevant for system thermal design.

Specification Differences

The specification tables for these two processors reveal a handful of meaningful divergences beyond the obvious core and thread counts. The Core i5-9600 operates with a base clock of 3.10 GHz, while the Xeon E3-1285 v6 runs at 4.10 GHz, a substantial difference in baseline frequency. Their boost clocks are identical at 4.50 GHz. The TDP differs as well, with the i5-9600 rated at 65 watts and the Xeon at 79 watts.

Cache specifications show the i5-9600 with 9 MB of shared L3 cache and the Xeon with 8 MB. Both share the same per-core L1 and L2 cache sizes of 64 KB and 256 KB, respectively. The Xeon E3-1285 v6 lists a transistor count of 1,400 million and a die size of 160 mm², while these fields are not available for the i5-9600. The i5-9600 lists a memory bandwidth of 42.7 GB/s, while the Xeon does not have a documented memory bandwidth figure in the data.

ECC memory support is exclusive to the Xeon E3-1285 v6, which also features HD Graphics P630 integrated graphics, compared to the UHD 630 on the i5-9600. The market segments differ, with the i5-9600 classified as Desktop and the Xeon as Server/Workstation. The i5-9600 is marked as end-of-life production status, while the Xeon's production status is not specified. The part numbers also differ, with the i5-9600 using SR3X2 and the Xeon E3-1285 v6 using SR373. Neither processor has a launch MSRP listed in the data, and both have locked multipliers.

Head-to-Head Benchmarks

The Cinebench suite provides a complete picture of the performance relationship between these two CPUs, and the results are remarkably consistent. The Core i5-9600 wins all six tests, but the largest winning margin is a mere 0.3%. Starting with Cinebench R23, the most current test in the set, the i5-9600 scores 1149 in singlecore against the Xeon's 1146, a 0.3% edge. In multicore, the i5-9600 scores 8141 versus 8119, again a 0.3% advantage. These results suggest that the i5-9600's extra two physical cores and additional 1 MB of L3 cache are just enough to offset the Xeon's higher base clock and Hyper-Threading advantage.

Moving to Cinebench R20, the pattern repeats. The i5-9600 takes singlecore with a score of 482 against the Xeon's 481, a 0.2% win. In multicore, the i5-9600 scores 3419 versus 3409, a 0.3% margin. The older Cinebench R15 test shows the same story, with the i5-9600 winning singlecore 115 to 115, a 0% delta, and multicore 820 to 818, a 0.2% difference. The singlecore tie in R15 is notable, as it indicates that the Xeon's higher base clock can fully neutralize the i5-9600's architectural advantages in certain lightly threaded scenarios.

Looking at the nearest rivals for context, both CPUs sit in a very tight performance cluster. The i5-9600's nearest rival is the Xeon E3-1285 v6 itself, with a delta of 0.3%. The AMD Ryzen 5 2500X scores 2361, which is 0.3% higher than the i5-9600 and 0.5% higher than the Xeon. The Intel Xeon E-2226GE scores 2365, and the Intel Xeon E-2234 scores 2374, both slightly ahead of both CPUs in this comparison. The Xeon E3-1285 v6's own rival list shows the same group, with deltas ranging from -0.3% against the i5-9600 to -1.1% against the Xeon E-2234.

The benchmark data indicates that any performance difference between the i5-9600 and the Xeon E3-1285 v6 is essentially negligible in synthetic rendering workloads. The i5-9600's six wins out of six tests give it a clean sweep, but the 0.2% to 0.3% deltas are within run-to-run variance territory for many testing environments. The real differentiators between these two parts are not raw speed but feature sets: ECC support and market segment on the Xeon side, versus core count, cache size, and lower TDP on the i5 side.