Intel Core i5-8500B vs Intel Xeon E3-1285 v6 Comparison

FAQ

Q: Which processor has more cores and threads?

A: The Intel Core i5-8500B has 6 cores and 6 threads, while the Intel Xeon E3-1285 v6 has 4 cores and 8 threads. The i5-8500B offers more physical cores, but the Xeon supports simultaneous multithreading, giving it two extra logical threads.

Q: How do their clock speeds compare?

A: The Xeon E3-1285 v6 runs at a base clock of 4.10 GHz and boosts to 4.50 GHz. The i5-8500B has a lower base clock of 3.00 GHz and a boost clock of 4.10 GHz. The Xeon holds a significant clock advantage at both idle and peak load.

Q: Which CPU supports ECC memory?

A: The Intel Xeon E3-1285 v6 supports ECC memory, while the Intel Core i5-8500B does not. This makes the Xeon the only option among the two for error-correcting memory in a workstation or server environment.

Q: What are their thermal design power ratings?

A: The i5-8500B has a TDP of 65 watts, while the Xeon E3-1285 v6 has a TDP of 79 watts. Despite having fewer cores, the Xeon draws more power due to its higher clock speeds.

Q: Which CPU scores higher in Cinebench R23?

A: The Xeon E3-1285 v6 wins in both Cinebench R23 tests. It scores 8119 in multicore and 1146 in singlecore, compared to the i5-8500B's 7480 and 1056 respectively. The Xeon leads by 7.9% in both tests.

Q: Do both processors use the same manufacturing process?

A: Yes, both are built on Intel's 14 nm process node. They also share the same dual-channel DDR4 memory support and PCIe Gen 3 with 16 lanes from the CPU.

Architecture Differences

The two CPUs come from different Intel microarchitectures. The Intel Core i5-8500B is based on Coffee Lake, while the Intel Xeon E3-1285 v6 uses Kaby Lake-DT. Both are manufactured on the 14 nm process at Intel, but the architectural split reflects their intended roles: the i5-8500B is a desktop part in a BGA 1440 package, whereas the Xeon targets server and workstation sockets with the Intel Socket 1151.

Core counts differ substantially. The i5-8500B provides 6 physical cores with 6 threads, meaning no hyper-threading. The Xeon E3-1285 v6 provides 4 physical cores but 8 threads, enabling simultaneous multithreading. This trade-off matters: the i5 has two extra cores, while the Xeon doubles its thread count per core.

Cache hierarchies also differ. Both CPUs have 64 KB of L1 cache and 256 KB of L2 cache per core, but the shared L3 cache is larger on the i5-8500B at 9 MB versus 8 MB on the Xeon. The Xeon compensates with a much higher base clock (4.10 GHz versus 3.00 GHz) and a higher boost clock (4.50 GHz versus 4.10 GHz).

Memory and platform features diverge in important ways. The i5-8500B supports only non-ECC DDR4, while the Xeon E3-1285 v6 supports ECC memory. The Xeon also lists a transistor count of 1,400 million and a die size of 160 mm², while the i5-8500B has a die size of 154 mm² with no transistor count listed. Integrated graphics differ as well: the i5 uses UHD Graphics 630, the Xeon uses HD Graphics P630. Both are locked processors (multiplier unlocked: false) and neither supports overclocking.

The market segments reflect their design intent. The i5-8500B is a desktop CPU with an end-of-life production status, released in April 2018. The Xeon E3-1285 v6 is a server or workstation CPU released in July 2017, with no production status listed. The i5-8500B has a launch MSRP of $192; the Xeon has no launch MSRP recorded in the database.

Where Each One Wins

The Xeon E3-1285 v6 wins every benchmark recorded in the head-to-head comparison, but the nature of those wins points to specific use cases. Its higher base and boost clocks make it the better choice for lightly threaded workloads where single-core performance is paramount, such as older applications, scripting, or database queries that rely on one or two threads. The Cinebench single-core scores support this: the Xeon leads by 7.8% to 7.9% across all three Cinebench versions.

The Xeon also wins in multicore tests despite having fewer physical cores. Its 8 threads and high clock speeds overcome the i5-8500B's 6-core advantage. For workloads that are well-optimized for simultaneous multithreading, the Xeon's thread count and clock speed combine to deliver consistent multicore wins. This makes it suitable for small-scale server tasks, virtualization hosts, or workstation builds where ECC memory is required.

The i5-8500B does not win a single benchmark in the head-to-head data. However, its architecture offers two more physical cores and a larger 9 MB L3 cache, which could benefit newer workloads that scale with core count rather than thread count, although the recorded benchmarks do not show any such advantage. Its lower 65 watt TDP also indicates a more power-efficient platform, which matters for compact or thermally constrained desktop builds.

In terms of platform flexibility, the i5-8500B's BGA 1440 socket indicates a soldered, non-upgradeable design, while the Xeon's Socket 1151 allows for a traditional socketed motherboard. The Xeon's ECC support makes it the only viable choice for systems that require data integrity in memory, such as file servers or scientific computing nodes. The i5-8500B, being a desktop part, is more aligned with consumer workloads, but the data shows it trails the Xeon in every measured metric.

Specification Differences

The two processors differ in several key specifications. The i5-8500B has 6 cores and 6 threads, while the Xeon E3-1285 v6 has 4 cores and 8 threads. Base clock speeds are 3.00 GHz for the i5 and 4.10 GHz for the Xeon; boost clocks are 4.10 GHz and 4.50 GHz respectively. TDP is 65 watts for the i5 and 79 watts for the Xeon.

Sockets differ: the i5 uses Intel BGA 1440, the Xeon uses Intel Socket 1151. The i5's architecture is Coffee Lake; the Xeon's is Kaby Lake with the Kaby Lake-DT codename. The i5's generation is listed as Core i5 (Coffee Lake), while the Xeon's is Xeon E3 (Kaby Lake-DT). The Xeon lists a transistor count of 1,400 million; the i5 does not. Die sizes are 154 mm² for the i5 and 160 mm² for the Xeon.

L3 cache is 9 MB shared on the i5 versus 8 MB shared on the Xeon. Memory bandwidth is listed only for the i5 at 42.7 GB/s; the Xeon has no recorded memory bandwidth. ECC memory support is absent on the i5 and present on the Xeon. Integrated graphics differ: UHD Graphics 630 on the i5, HD Graphics P630 on the Xeon.

Market segment, production status, release date, and part numbers also differ. The i5 is a desktop part with end-of-life status, released in April 2018, part number SRCX3. The Xeon is a server or workstation part with no production status listed, released in July 2017, part number SR373. The i5 has a launch MSRP of $192; the Xeon has none recorded. Both CPUs support DDR4 memory, dual-channel memory bus, PCIe Gen 3 with 16 lanes from the CPU, and neither has an unlocked multiplier.

Head-to-Head Benchmarks

The benchmark data shows a clean sweep for the Xeon E3-1285 v6 across all six recorded comparisons. In Cinebench R15 multicore, the Xeon scores 818 against the i5-8500B's 753, a 7.9% lead. The single-core R15 test follows the same pattern: Xeon 115, i5 106, a 7.8% difference.

Cinebench R20 results are nearly identical in margin. The Xeon scores 3409 in multicore versus 3141 for the i5, a 7.9% gap. In single-core R20, the Xeon's 481 beats the i5's 443, again by 7.9%. These consistent deltas suggest the Xeon's clock speed advantage translates directly into proportional performance gains across different rendering workloads.

Cinebench R23 confirms the trend. The Xeon scores 8119 in multicore and 1146 in singlecore, while the i5 scores 7480 and 1056 respectively. Both deltas are exactly 7.9%. The consistency of this margin across three generations of Cinebench suggests a stable performance relationship determined by clock speed and thread efficiency.

Geekbench results are available only for the i5-8500B, with a multicore score of 4998 and a singlecore score of 1407. The Xeon has no Geekbench entry in the database, so no direct comparison is possible for that test suite. The i5's average benchmark score across all recorded tests is 2423, placing it in the 48th percentile of all CPUs. The Xeon's average benchmark score is 2348, also in the 48th percentile. Despite the Xeon winning every head-to-head test, its average score is lower because it lacks the Geekbench results that boost the i5's average.

The nearest rivals for the i5 include the AMD Ryzen 5 4680U (average score 2424, 0.1% higher), the Intel Core i7-9850HE (2421, 0.1% lower), and the AMD Ryzen 3 PRO 4450U (2413, 0.4% lower). The Xeon's nearest rivals include the Intel Core i5-9600 (2354, 0.3% higher), AMD Ryzen 5 2500X (2361, 0.5% higher), and Intel Xeon E-2226GE (2365, 0.7% higher). The Xeon sits below all of its nearest rivals in average score.

The Verdict

The data is unambiguous: the Intel Xeon E3-1285 v6 outperforms the Intel Core i5-8500B in every benchmark where both were measured. If raw performance is the only criterion, the Xeon is the correct pick. Its higher clocks, 8 threads, and ECC support make it suitable for workstation and server builds where single-thread speed and memory reliability matter more than physical core count.

The i5-8500B should be chosen by builders who prioritize its lower 65 watt TDP, larger 9 MB L3 cache, and desktop-oriented platform. Its BGA 1440 socket indicates a soldered design, which is common in compact or embedded systems. Its 6 physical cores may benefit workloads that scale with cores rather than threads, though the recorded benchmarks do not demonstrate any such advantage over the Xeon.

For a system that needs ECC memory, the Xeon is the only option. For a system that needs the lowest power draw and a newer release date, the i5-8500B has merit. But the benchmark record shows the Xeon leading by 7.9% in all Cinebench tests, and that consistency is hard to ignore. The verdict from the data: choose the Xeon E3-1285 v6 for performance-critical and memory-reliable builds, choose the i5-8500B only when its lower TDP and desktop form factor are explicit requirements.