Intel Core i3-9350KF vs Intel Xeon E3-1275 v5 Comparison

The comparison between the Intel Core i3-9350KF and the Intel Xeon E3-1275 v5 presents a clear-cut case in the database, with one processor dominating every recorded benchmark. The data shows a consistent pattern: the Xeon E3-1275 v5 holds a decisive advantage across all Cinebench tests, while the Core i3-9350KF counteracts with a higher boost clock and a more recent architecture. This analysis breaks down where each processor excels, what the architectural differences imply, and which workloads favor which chip.

Where Each One Wins

The benchmark record is unambiguous: the Intel Xeon E3-1275 v5 wins all six head-to-head tests in the database. In Cinebench R15, R20, and R23, the Xeon leads in both multicore and singlecore runs. The multicore margin is consistent at 10.1% across all three Cinebench versions, while the singlecore margin sits at 10% in R15 and R20, and 10.1% in R23. For the Core i3-9350KF, there are zero recorded wins in the head-to-head comparison.

However, the Core i3 does hold a notable advantage outside the direct benchmark suite. Its boost clock of 4.60 GHz is higher than the Xeon's 4.00 GHz, which suggests a potential edge in short, lightly threaded bursts. Yet the recorded data does not confirm this in practice, as the Xeon still wins every singlecore test. The Core i3 also has a higher base clock at 4.00 GHz versus 3.60 GHz, but again, this does not translate to a benchmark victory.

The Xeon's wins are built on its thread count. With 8 threads versus the Core i3's 4, the Xeon can handle more parallel work, which explains the consistent 10.1% multicore lead. For singlecore, the Xeon's advantage is smaller but still present, likely due to the Core i3's lower average benchmark score and the Xeon's more efficient Skylake core design. In practical terms, the Xeon is the winner for any workload that scales with threads, such as rendering, compilation, or server tasks, while the Core i3's higher clocks may help in single-threaded applications, but the data does not back that up.

Architecture Differences

The two processors come from different architectural generations within Intel's 14 nm process. The Core i3-9350KF is built on Coffee Lake, specifically the Coffee Lake Refresh generation, while the Xeon E3-1275 v5 uses Skylake-DT. Both share the same 14 nm process node and are manufactured by Intel, but the die sizes differ slightly: the Core i3 measures 126 mm², and the Xeon is smaller at 122 mm². The transistor count is only listed for the Xeon at 1,750 million, providing a glimpse into its internal complexity.

Cache configurations are identical in structure: both have 64 KB of L1 per core, 256 KB of L2 per core, and 8 MB of shared L3. This parity means the performance gap is not explained by cache capacity. The memory support differs, with the Core i3 limited to DDR4, while the Xeon supports both DDR3 and DDR4. Memory bandwidth favors the Core i3 at 38.4 GB/s versus the Xeon's 34.1 GB/s, yet this does not overturn the benchmark results.

A key feature difference is integrated graphics. The Xeon includes HD Graphics P530, while the Core i3-9350KF has no integrated graphics listed. This makes the Xeon more versatile for systems without a discrete GPU. Both support ECC memory, which is unusual for a desktop part like the Core i3 and aligns with the Xeon's server/workstation market segment. The socket is the same, Intel Socket 1151, and both use PCIe Gen 3 with 16 CPU-only lanes. The production status is end-of-life for both, and neither has an unlocked multiplier.

FAQ

Q: Which processor has a higher average benchmark score?

A: The Core i3-9350KF records an average benchmark score of 2082, while the Xeon E3-1275 v5 scores 2043. The Core i3 sits at the 46th percentile of all CPUs, and the Xeon is at the 45th percentile.

Q: Why does the Xeon win all head-to-head tests despite the Core i3's higher clocks?

A: The Xeon's advantage comes from having 8 threads versus 4, which allows better utilization of multicore workloads. In singlecore tests, the Xeon still leads by 10% in R15 and R20, suggesting its Skylake core design extracts more performance per clock than the Coffee Lake part in these specific benchmarks.

Q: Can the Core i3 use DDR3 memory?

A: No, the Core i3-9350KF only supports DDR4 memory. The Xeon E3-1275 v5 supports both DDR3 and DDR4, offering more flexibility for existing memory infrastructure.

Q: Do both processors support ECC memory?

A: Yes, both the Core i3-9350KF and the Xeon E3-1275 v5 have ECC memory support listed in the database. This is notable for the Core i3, which is a desktop part, but it shares this server-oriented feature with the Xeon.

Q: Which processor has a higher boost clock?

A: The Core i3-9350KF has a boost clock of 4.60 GHz, which is higher than the Xeon E3-1275 v5's boost clock of 4.00 GHz. The base clock is also higher on the Core i3 at 4.00 GHz versus 3.60 GHz.

Q: Which processor has a smaller die size?

A: The Xeon E3-1275 v5 has a die size of 122 mm², while the Core i3-9350KF measures 126 mm². The Xeon also has a lower TDP of 80 watts compared to the Core i3's 91 watts.

Specification Differences

The two processors differ in several key specifications. The Core i3-9350KF has 4 cores and 4 threads, while the Xeon E3-1275 v5 has 4 cores and 8 threads. Base clocks are 4.00 GHz for the Core i3 and 3.60 GHz for the Xeon, with boost clocks at 4.60 GHz and 4.00 GHz respectively. TDP is lower on the Xeon at 80 watts versus 91 watts on the Core i3.

Architecture and generation differ, with the Core i3 using Coffee Lake and the Xeon using Skylake-DT. The die size is 126 mm² for the Core i3 and 122 mm² for the Xeon, and the transistor count is only specified for the Xeon at 1,750 million. Memory support is DDR4-only for the Core i3, while the Xeon supports DDR3 and DDR4. Memory bandwidth is 38.4 GB/s for the Core i3 and 34.1 GB/s for the Xeon.

The Core i3 has no integrated graphics, while the Xeon includes HD Graphics P530. The market segment is Desktop for the Core i3 and Server/Workstation for the Xeon. Release dates show the Core i3 came later, on 2019-01-07, while the Xeon was released on 2015-10-18. The part numbers are SRF7V for the Core i3 and SR2LKSR2CT for the Xeon. The launch MSRP for the Core i3 is $173, and for the Xeon it is $350.

Head-to-Head Benchmarks

The head-to-head results are one-sided. In Cinebench R15 multicore, the Xeon scores 712 against the Core i3's 640, a 10.1% difference. The singlecore R15 test shows the Xeon at 100 versus 90, a 10% lead. Moving to Cinebench R20, the Xeon wins multicore with 2967 against 2667, again a 10.1% gap, and singlecore with 418 versus 376, a 10% difference.

Cinebench R23 continues the pattern. The Xeon scores 7065 in multicore versus 6352 for the Core i3, a 10.1% margin, and 997 in singlecore versus 896, a 10.1% margin. Across all six tests, the Xeon's smallest win is 10% in the R15 and R20 singlecore runs, and its largest is 10.1% in the other four tests. The consistency of these margins suggests a structural advantage, not a workload-specific quirk.

Looking at the nearest rivals, the Core i3 sits near the AMD Ryzen 7 1700X, which has an average score of 2094 and a delta of -0.6%, and the Intel Xeon W-2123 at 2079 with a delta of 0.2%. The Xeon's closest competitor is the Intel Xeon E3-1270 v5 at 2048 with a delta of -0.2%, and the AMD Ryzen 5 7520U at 2046 with a delta of -0.1%. These comparisons show both processors are tightly clustered in overall performance, despite the Xeon's clear win in the direct matchup.

The Verdict

The data points to a single conclusion: the Intel Xeon E3-1275 v5 is the faster processor in every recorded benchmark. If the choice is purely about performance in Cinebench workloads, the Xeon is the pick, offering a consistent 10% or better lead in both singlecore and multicore tests. The Core i3-9350KF cannot claim a single victory in the head-to-head suite.

For users who need integrated graphics, the Xeon is the only option, as the Core i3 has none. For those with DDR3 memory on hand, the Xeon supports it, while the Core i3 does not. The Xeon also runs cooler in terms of TDP, at 80 watts versus 91 watts, and has a smaller die size.

The Core i3's strengths are its higher clocks and newer architecture. Its boost clock of 4.60 GHz is notably higher, and its memory bandwidth is better at 38.4 GB/s. However, these advantages do not show up in the benchmark results, where the Xeon wins every time. The higher average benchmark score for the Core i3, at 2082 versus 2043, is influenced by its nearest rivals, but the direct comparison overrides that.

The verdict is straightforward. The Xeon E3-1275 v5 is the superior choice for any workload represented in the database, particularly multicore rendering. The Core i3-9350KF might appeal to those prioritizing clock speed or a lower launch MSRP, but the recorded data shows the Xeon as the decisive winner. For a server or workstation task, the Xeon's thread count and ECC support make it the logical selection. For a desktop build where every benchmark matters, the Xeon still comes out ahead.