Intel Core i7-9800X vs Intel Xeon W-2145 Comparison

Where Each One Wins

The benchmark results split these two 8-core, 16-thread processors along predictable lines, but with one striking outlier. The Intel Core i7-9800X takes seven of eight head-to-head tests, yet the Intel Xeon W-2145 claims the single most lopsided victory in the entire comparison.

The Core i7-9800X dominates the Cinebench suite across every version and workload type. In Cinebench R15, R20, and R23, it wins both multicore and singlecore tests, with margins ranging from 0.7% to 0.9%. These are narrow but consistent advantages. The 9800X also wins the Geekbench singlecore test by 3.8%, its largest margin outside the Cinebench family.

The Xeon W-2145, meanwhile, posts a decisive 16.3% win in Geekbench multicore, scoring 8712 against the Core i7's 7488. That is the only test where the Xeon leads, but the margin is so substantial that it reshapes the practical verdict. In workloads that resemble Geekbench's multicore mix, the Xeon is meaningfully faster, not just marginally ahead.

The overall win tally (7 for the Core i7, 1 for the Xeon) can mislead. The Cinebench wins are close enough that they would rarely decide a purchase. The Geekbench multicore gap is large enough to be felt in real-world multitasking, compilation, or other parallel integer workloads. So while the Core i7 wins the majority of benchmarks, the Xeon wins the test where the difference actually matters.

Architecture Differences

Both processors share the same Skylake architecture family, the same 14 nm process node, and the same Intel Socket 2066. They also both offer 8 cores and 16 threads, with identical 64 KB L1 and 1 MB L2 caches per core. The similarities end there.

The Core i7-9800X uses the Skylake-X architecture, while the Xeon W-2145 uses Skylake-W. The Core i7 has a larger shared L3 cache at 16.5 MB, compared to 11 MB on the Xeon. That 5.5 MB difference helps explain the Core i7's slight edge in Cinebench, which often responds to cache capacity.

The Xeon W-2145 operates at a 3.70 GHz base clock versus 3.80 GHz on the Core i7, though both boost to 4.50 GHz. The Xeon carries a 140 W TDP, while the Core i7 is rated at 165 W. Despite the lower TDP, the Xeon delivers the higher Geekbench multicore score, suggesting different power management or boost behavior under sustained loads.

Memory support is identical in bus width and bandwidth: both use quad-channel DDR4 with 85.3 GB/s. The Xeon adds ECC memory support, which the Core i7 lacks. The Xeon also provides 48 PCIe Gen 3 lanes from the CPU, versus 44 on the Core i7. That extra connectivity, plus ECC, positions the Xeon for workstation and server duties.

The Core i7 has an unlocked multiplier, making it overclocking-friendly, while the Xeon is locked. The Core i7 targets the desktop market segment, the Xeon targets server and workstation. The Core i7 launched about 14 months later, in October 2018 versus August 2017. Both are end-of-life products today.

Head-to-Head Benchmarks

The Cinebench results form a tight cluster. In Cinebench R15 multicore, the Core i7-9800X scores 1553 against the Xeon's 1542, a 0.7% lead. The singlecore R15 test shows 219 versus 217, a 0.9% margin. Cinebench R20 multicore gives the Core i7 a 6474 to 6425 win, 0.8% ahead, and singlecore R20 shows 913 versus 906, also 0.8%. Cinebench R23 repeats the pattern: 15416 to 15299 in multicore (0.8%) and 2176 to 2159 in singlecore (0.8%).

These margins are nearly identical across the three Cinebench versions, which suggests a consistent architectural advantage rather than a workload-specific quirk. The Core i7's larger L3 cache likely contributes to this steady but small lead.

The Geekbench results break the pattern. The Xeon W-2145 scores 8712 in multicore, while the Core i7-9800X scores 7488. That 16.3% gap is the largest delta in either direction across all eight tests. In Geekbench singlecore, the Core i7 reverses course with 1398 versus 1345, a 3.8% win.

The Geekbench multicore result is worth examining closely. A 1224-point difference is far beyond what the Cinebench margins would predict. It suggests the Xeon sustains higher clocks across all cores in certain workloads, or that the Skylake-W design handles the Geekbench memory access patterns more efficiently. The quad-channel DDR4 and ECC controller may also play a role in how the Xeon manages data flow.

For buyers, the practical takeaway is clear: in rendering and traditional CPU compute (Cinebench), the Core i7 is slightly faster. In broader system-level multitasking (Geekbench), the Xeon is substantially faster. The two CPUs are not interchangeable despite sharing core counts and socket.

FAQ

Q: Which processor has more cores and threads?

A: Both have exactly 8 cores and 16 threads. There is no difference in parallel thread capacity.

Q: Which CPU wins more benchmarks?

A: The Intel Core i7-9800X wins 7 of 8 head-to-head tests, including all six Cinebench tests and Geekbench singlecore. The Intel Xeon W-2145 wins only Geekbench multicore, but by a large 16.3% margin.

Q: What is the cache difference between the two?

A: Both have 64 KB L1 and 1 MB L2 per core. The Core i7-9800X has 16.5 MB of shared L3 cache, while the Xeon W-2145 has 11 MB. That is a 5.5 MB advantage for the Core i7.

Q: Do both processors support ECC memory?

A: No. The Xeon W-2145 supports ECC memory. The Core i7-9800X does not.

Q: Which CPU has more PCIe lanes?

A: The Xeon W-2145 provides 48 PCIe Gen 3 lanes from the CPU. The Core i7-9800X provides 44 lanes. Both use Gen 3, but the Xeon has four additional lanes.

Q: Can either processor be overclocked?

A: The Core i7-9800X has an unlocked multiplier and supports overclocking. The Xeon W-2145 has a locked multiplier and does not.

Q: How do their average benchmark scores compare?

A: The Xeon W-2145 has an average benchmark score of 4576, placing it slightly ahead of the Core i7-9800X at 4455. Both sit in the 58th percentile of all CPUs in the database.

The Verdict

The data supports a clear split based on use case. For rendering, video encoding, and single-threaded applications, the Intel Core i7-9800X holds a consistent, if small, advantage. Its Cinebench wins across R15, R20, and R23, in both singlecore and multicore, make it the safer pick for creative workloads that rely on those engines.

For mixed productivity, virtualization, or any workload that mirrors Geekbench's multicore pattern, the Intel Xeon W-2145 is the stronger choice. Its 16.3% multicore lead is not marginal; it is a decisive gap that would translate to noticeably faster completion times in parallel integer tasks. The Xeon also offers ECC memory support and four additional PCIe lanes, which matter for data integrity and expansion in a workstation environment.

The Core i7-9800X counters with a higher base clock (3.80 GHz versus 3.70 GHz), more L3 cache (16.5 MB versus 11 MB), and an unlocked multiplier for overclocking. Its 165 W TDP is higher than the Xeon's 140 W, but enthusiasts may accept that for tuning headroom. The Core i7 also launched at a lower MSRP of $589, compared to $1113 for the Xeon.

Both processors occupy the 58th percentile of all CPUs, and their average benchmark scores are close (4576 for the Xeon, 4455 for the Core i7). The nearest rivals for the Xeon include the Intel Xeon E-2356G (0.6% higher average) and Intel Core i9-10900 (0.8% lower), while the Core i7's nearest rivals include the AMD Ryzen 5 PRO 5650GE (0.3% higher) and Intel Core i7-12700TE (1.3% lower). These comparisons confirm both chips sit in a crowded mid-pack.

The final recommendation hinges on workload. If the primary applications are Cinebench-style renders and single-threaded tasks, the Core i7-9800X wins on consistency. If the workload involves broad multitasking, server-style duties, or memory reliability requirements, the Xeon W-2145's Geekbench multicore dominance and ECC support make it the data-backed choice. Neither CPU is a clear overall winner; each leads in the domains it was designed to serve.