Intel Core i5-8600T vs Intel Xeon E3-1285 v6 Comparison

The Intel Core i5-8600T and Intel Xeon E3-1285 v6 are both 14nm Intel Socket 1151 processors, yet they occupy opposite ends of the design spectrum: one is a low-power desktop chip, the other a high-clock server/workstation part. Despite these differences, the benchmark data reveals a surprisingly consistent performance hierarchy, with the Xeon securing every single head-to-head victory, though by a narrow margin across the board.

Head-to-Head Benchmarks

The Xeon E3-1285 v6 wins all six head-to-head benchmark comparisons, but the deltas are remarkably tight. In Cinebench R15 multi-core, the Xeon scores 818 against the i5-8600T’s 784, a 4.2% advantage. The single-core R15 test shows the same pattern: 115 versus 110, a 4.3% lead for the Xeon. Moving to Cinebench R20, the Xeon’s multi-core score of 3409 surpasses the i5’s 3270 by 4.1%, while single-core sees 481 versus 461, a 4.2% gap. The most recent Cinebench R23 results continue this trend: the Xeon posts 8119 multi-core and 1146 single-core, beating the i5’s 7787 and 1099, respectively, with a 4.1% delta in both tests.

The uniformity of these deltas—hovering between 4.1% and 4.3%—is striking. It suggests that the Xeon’s advantage is not workload-specific but rather a consistent clock-speed-driven edge. The i5-8600T’s boost clock of 3.70 GHz simply cannot match the Xeon’s 4.50 GHz boost, even though the i5 has two additional physical cores (6 versus 4) and more threads (6 versus 8). Interestingly, the i5’s multi-core deficit is nearly identical to its single-core deficit, implying that the Xeon’s higher per-core throughput fully compensates for its lower core count. The Geekbench scores, available only for the i5 (4277 multi-core, 1278 single-core), cannot be directly compared here, but the i5’s average benchmark score of 2383 sits slightly above the Xeon’s 2348, a quirk explained by the different test suites included in each average.

FAQ

Q: Which processor wins more benchmark tests?

A: The Intel Xeon E3-1285 v6 wins all six head-to-head tests, covering Cinebench R15, R20, and R23 in both multi-core and single-core modes. The i5-8600T records zero wins in this direct comparison.

Q: How large is the performance gap between the two CPUs?

A: The Xeon leads by 4.1% to 4.3% in every test. The narrowest margins appear in R23 multi-core and R20 multi-core (4.1%), while the widest is R15 single-core (4.3%).

Q: Does the i5-8600T’s higher core count help it in multi-threaded workloads?

A: No. Despite having 6 cores versus the Xeon’s 4, the i5 trails by 4.1% in R20 and R23 multi-core tests. The Xeon’s higher base clock (4.10 GHz versus 2.30 GHz) and boost clock (4.50 GHz versus 3.70 GHz) more than offset the core deficit.

Q: Are these processors in the same performance percentile?

A: Yes, both sit at the 48th percentile compared to all CPUs tracked in the database. Their average benchmark scores are also close: 2383 for the i5 and 2348 for the Xeon, a difference of about 1.5%.

Q: What is the TDP difference, and does it affect benchmarks?

A: The i5-8600T has a TDP of 35 watts, while the Xeon E3-1285 v6 has a TDP of 79 watts. The benchmark data shows the higher-TDP Xeon consistently outperforms the i5, suggesting the extra power budget translates into sustained clock speeds.

Q: Which CPU supports ECC memory?

A: Only the Intel Xeon E3-1285 v6 supports ECC memory. The i5-8600T does not list ECC support in its specifications.

Architecture Differences

The two processors stem from different Intel architecture generations. The i5-8600T uses Coffee Lake, while the Xeon E3-1285 v6 is built on Kaby Lake-DT. Both are fabricated on Intel’s 14 nm process, but the Xeon’s die is slightly larger at 160 mm² compared to the i5’s 154 mm². The Xeon also carries a documented transistor count of 1,400 million, whereas the i5’s transistor count is not listed in the data.

The core and thread configurations diverge significantly. The i5 offers 6 cores and 6 threads—no hyper-threading—while the Xeon provides 4 cores and 8 threads, leveraging simultaneous multithreading to double its thread count. Cache hierarchies also differ: the i5 has 9 MB of shared L3 cache, while the Xeon has 8 MB. Both share identical per-core L1 (64 KB) and L2 (256 KB) caches.

The integrated graphics differ as well. The i5 pairs with UHD Graphics 630, whereas the Xeon uses HD Graphics P630. Both support DDR4 memory in dual-channel mode, and the i5’s memory bandwidth is specified at 42.7 GB/s, while the Xeon’s bandwidth is not provided in the data. The market positioning is explicit: the i5 is a Desktop part, while the Xeon targets the Server/Workstation segment, which explains its ECC memory support and the i5’s lack thereof.

Specification Differences

The most glaring specification gap is clock speed. The Xeon E3-1285 v6 runs at 4.10 GHz base and 4.50 GHz boost, while the i5-8600T operates at 2.30 GHz base and 3.70 GHz boost. This 1.80 GHz base-clock difference is substantial and likely drives most of the benchmark results.

Core and thread counts also differ: the i5 has 6 cores and 6 threads, while the Xeon has 4 cores and 8 threads. TDP is another major differentiator—the i5 draws only 35 watts, while the Xeon consumes 79 watts, a 44-watt gap that reflects the Xeon’s aggressive clock strategy. The i5’s L3 cache is 9 MB versus the Xeon’s 8 MB, and the die sizes differ slightly (154 mm² versus 160 mm²). The Xeon supports ECC memory; the i5 does not. The i5 has a listed launch MSRP of $213, while the Xeon’s launch MSRP is not recorded in the data. The i5’s release date is April 2018, while the Xeon’s is July 2017. Both use the same socket (Intel Socket 1151) and PCIe configuration (Gen 3, 16 lanes CPU-only), and neither has an unlocked multiplier.

Where Each One Wins

The data presents a clear picture: the Xeon E3-1285 v6 wins every single benchmark comparison, making it the outright performance leader in this matchup. Its victories span both multi-core and single-core Cinebench tests across R15, R20, and R23, with consistent 4.1% to 4.3% margins. This suggests the Xeon is better suited for any workload that prioritizes raw CPU throughput, whether single-threaded or multi-threaded, as long as the 79-watt TDP is acceptable.

The i5-8600T’s strengths do not appear in the head-to-head benchmarks, but its specification sheet reveals its advantages. The 35-watt TDP makes it significantly more power-efficient, and its 6-core/6-thread configuration provides more physical cores, which could be advantageous in scenarios where per-core licensing or specific core-count optimizations matter. The i5 also has a larger L3 cache (9 MB versus 8 MB) and a lower launch MSRP of $213, though pricing considerations are outside the scope of this analysis.

For workloads that are sensitive to clock speed—such as lightly threaded tasks or applications with poor scaling—the Xeon’s 4.50 GHz boost clock gives it a decisive edge. For power-constrained environments or applications that benefit from additional physical cores, the i5’s lower TDP and higher core count present a viable alternative, even if its benchmark scores lag.

The Verdict

The benchmark data is unambiguous: the Intel Xeon E3-1285 v6 is the faster processor in this comparison, winning all six head-to-head tests with margins between 4.1% and 4.3%. Its superior clock speeds—4.10 GHz base and 4.50 GHz boost—overcome the i5-8600T’s two-core advantage in every workload tested. Users who need maximum CPU performance, particularly in single-threaded or moderately threaded applications, should choose the Xeon, provided they can accommodate its 79-watt TDP and do not require the i5’s lower power draw.

The i5-8600T, despite losing every benchmark, retains a role for specific use cases. Its 35-watt TDP makes it an excellent choice for compact or passively cooled systems where thermal headroom is limited. Its 6 physical cores, while slower per-core, may benefit workloads that scale across cores rather than relying on clock speed. The i5 also supports the same DDR4 memory and PCIe Gen 3 configuration, making it a drop-in alternative for Socket 1151 builds that prioritize efficiency over peak performance. However, for any task where the benchmark scores are the deciding factor, the Xeon E3-1285 v6 is the clear winner, and the data shows no scenario where the i5 closes the gap.