Intel Core i3-9350K vs Intel Xeon E3-1285 v4 Comparison

Two Intel quad-core processors from different eras meet in an unusual matchup: a Coffee Lake desktop part with an unlocked multiplier against a Broadwell-based workstation Xeon with twice the threads. On paper the Xeon looks like the obvious pick, and the benchmark data largely agrees, but the margin is narrow enough, and the feature sets differ enough, that the choice is not automatic. What follows is a close reading of the recorded measurements.

The Verdict

The Xeon E3-1285 v4 wins every recorded benchmark in this comparison, six tests out of six, and its average benchmark score of 1908 edges out the Core i3-9350K's 1867. That is a clean sweep, but the deltas tell a more interesting story: the Xeon leads by between 2.1 and 2.3 percent across every Cinebench run, a spread so tight it suggests the two chips trade blows within measurement noise rather than occupying different tiers. Both sit nearly side by side in the database rankings, with the i3-9350K at the 42nd percentile against all recorded CPUs and the Xeon at the 43rd.

So who should pick which? The data points to the Xeon for anyone chasing maximum throughput per test, however small the advantage. Its multi-threaded scores benefit from eight threads against the i3's four, and its single-core numbers are also ahead despite a much lower boost clock, which raises questions worth investigating about architectural efficiency. The i3-9350K, meanwhile, is the pick for tuners: it has an unlocked multiplier, while the Xeon is locked. It also carries a launch MSRP of $184 against the Xeon's $556, a gap that dwarfs the performance difference. The i3 additionally supports DDR4 rather than DDR3, which matters for platform building even though neither chip is still in production.

Where Each One Wins

Strictly on benchmark wins, the Xeon takes everything. Cinebench R15 multi-core: 664 to 650. Cinebench R15 single-core: 93 to 91. Cinebench R20 multi-core: 2770 to 2711. Cinebench R20 single-core: 391 to 382. Cinebench R23 multi-core: 6596 to 6456. Cinebench R23 single-core: 931 to 911. The pattern is consistent to an almost suspicious degree; the Xeon's advantage holds at roughly two percent whether the workload spans all threads or just one.

That consistency is itself informative. If the Xeon's multi-core lead came purely from having eight threads versus four, the gap should widen in multi-core tests and shrink in single-core ones. It does not. The single-core deltas (2.2 and 2.3 percent in R15 and R20) are actually the largest in the dataset. This implies the Xeon's per-thread work is genuinely stronger, plausibly helped by its Iris Pro P6300 graphics die contributing to a larger 182 mm² package with more on-die resources, though the recorded data does not isolate the cause. It also implies the extra threads are not being fully exploited by these rendering workloads, or the i3's higher clocks are compensating almost exactly.

Where does the i3-9350K win? Not in any benchmark. Its wins are in the specification column: the unlocked multiplier for overclocking, DDR4 memory support with 38.4 GB/s of bandwidth against the Xeon's DDR3 at 29.9 GB/s, a higher boost clock at 4.60 GHz versus 3.80 GHz, and a lower TDP at 91 watts versus 95. For a builder who intends to tune the chip past stock speeds, that multiplier lock on the Xeon is a hard ceiling the i3 simply does not have.

Architecture Differences

Both chips come from Intel on the same 14 nm process, which makes the generational gap the core story. The i3-9350K is Coffee Lake, released in April 2019 as part of the Coffee Lake Refresh generation, while the Xeon E3-1285 v4 is Broadwell-DT, released in June 2015. Four years separate them, yet the process node did not change between the two.

The core and thread counts diverge sharply. The i3 pairs 4 cores with 4 threads, no Hyper-Threading. The Xeon pairs 4 cores with 8 threads. Cache also differs: the i3 carries 8 MB of shared L3 against the Xeon's 6 MB, while both share identical per-core L1 (64 KB) and L2 (256 KB) configurations.

Platform compatibility is a genuine fork in the road. The i3 uses Intel Socket 1151 and the Xeon uses Intel Socket 1150, so the two are not interchangeable on any board. Memory support follows the platform split: DDR4 dual-channel on the i3, DDR3 dual-channel on the Xeon. Both offer ECC memory support, a notable feature for a consumer-branded Core i3. Both provide PCIe Gen 3 with 16 CPU lanes.

Integrated graphics differ in class. The i3 ships with UHD 630, a mainstream desktop solution. The Xeon carries Intel Iris Pro P6300, which in this family typically indicates embedded cache aimed at graphics work. The market segments also differ: Desktop for the i3, Server/Workstation for the Xeon, which explains the Xeon's locked multiplier and its positioning. Both parts are now end-of-life, and die sizes differ at 126 mm² for the i3 versus 182 mm² for the Xeon.

FAQ

Q: Which CPU is faster in benchmarks?

A: The Xeon E3-1285 v4 wins all six recorded Cinebench tests, with advantages of 2.1 to 2.3 percent. Its average benchmark score of 1908 also beats the i3-9350K's 1867.

Q: Does the Xeon's extra thread count translate to a big multi-core lead?

A: No. Despite having 8 threads to the i3's 4, the Xeon's multi-core wins are the same 2.1 percent margin as its other results. The recorded data suggests the rendering tests are not scaling with the Xeon's thread advantage, or the i3's higher clocks offset it.

Q: Can either CPU be overclocked?

A: Only the Core i3-9350K. Its multiplier is unlocked, while the Xeon E3-1285 v4's is locked.

Q: Do both support ECC memory?

A: Yes, both the i3-9350K and the Xeon E3-1285 v4 support ECC, which is unusual for a Core i3 desktop part.

Q: Are the two chips socket-compatible?

A: No. The i3-9350K requires Intel Socket 1151 and the Xeon E3-1285 v4 requires Intel Socket 1150. A platform choice between them is a choice between DDR4 and DDR3 memory as well.

Q: How do they rank against all CPUs in the database?

A: They are nearly tied: the i3-9350K sits at the 42nd percentile and the Xeon E3-1285 v4 at the 43rd percentile. Both are mid-pack parts by current standards.

Head-to-Head Benchmarks

Starting with the oldest test, Cinebench R15 multi-core finishes 664 to 664's rival, 650, a 2.1 percent win for the Xeon. The R15 single-core result is 93 versus 91, a 2.2 percent Xeon edge. Moving to Cinebench R20, the multi-core scores are 2770 for the Xeon and 2711 for the i3, again 2.1 percent, and single-core comes in at 391 against 382, the Xeon's largest margin at 2.3 percent.

Cinebench R23, the most modern and demanding of the three revisions, shows the same shape. Multi-core: 6596 to 6456 in the Xeon's favor, 2.1 percent. Single-core: 931 to 911, also 2.1 percent. Six tests, six Xeon wins, and a delta range narrow enough to fit inside a single percentage band.

The investigative question this raises: how does a 2015 Broadwell part with a 3.80 GHz boost beat a 2019 Coffee Lake part boosting to 4.60 GHz in single-core tests? The recorded data cannot fully answer it, but the consistent margin across single- and multi-core alike points to something other than thread count. Whether it stems from the Xeon's workstation validation, its larger die, or characteristics of the specific test systems behind these submissions is beyond what the scores alone reveal.

For context against the wider field, the i3-9350K's average score of 1867 places it within a fraction of a percent of chips like the Intel Xeon E5-1630 v4 (1869, a 0.1 percent gap), the Intel Core i5-1035G4 (1861, 0.3 percent), and the Intel Xeon E3-1545M v5 (1879, 0.6 percent). The Xeon E3-1285 v4's 1908 lands it effectively level with the Intel Xeon E5-2620 v3 (1907), the AMD Ryzen 5 PRO 2400GE (1910), the Intel Xeon E3-1575M v5 (1910), and the Intel Xeon E-2314 (1911). In other words, both processors occupy the same crowded neighborhood of mid-range performers, separated by less than the distance to their own nearest rivals' cluster.

Specification Differences

The two chips match on manufacturer, process node (14 nm from Intel), core count (4), L1 and L2 cache per core, memory bus (dual-channel), ECC support, PCIe configuration (Gen 3, 16 CPU lanes), and production status (both end-of-life). Everything else differs.

Threads: 4 on the i3-9350K, 8 on the Xeon E3-1285 v4. Base clock: 4.00 GHz versus 3.50 GHz. Boost clock: 4.60 GHz versus 3.80 GHz. TDP: 91 watts versus 95 watts. Socket: 1151 versus 1150. Architecture: Coffee Lake versus Broadwell-DT. Die size: 126 mm² versus 182 mm². Shared L3 cache: 8 MB on the i3, 6 MB on the Xeon. Memory: DDR4 on the i3 with 38.4 GB/s of bandwidth, DDR3 on the Xeon with 29.9 GB/s. Integrated graphics: UHD 630 versus Iris Pro P6300. Market segment: Desktop versus Server/Workstation. Multiplier: unlocked on the i3, locked on the Xeon. Launch MSRP: $184 for the i3-9350K, $556 for the Xeon E3-1285 v4. Release dates sit four years apart, and part numbers differ as SRCZT versus SR2CX.

The final tally is a study in trade-offs. The Xeon E3-1285 v4 is the benchmark winner on every recorded test, by a slim and remarkably uniform margin. The i3-9350K counters with modern platform features, an unlocked multiplier, more L3 cache, and higher clocks that, curiously, do not convert into benchmark wins. For pure stock performance, the data favors the Xeon. For everything else, the specification sheet favors the newer chip.