Intel Core i9-9820X vs Intel Xeon W-2150B Comparison

The Intel Core i9-9820X and Intel Xeon W-2150B are both 10-core, 20-thread Skylake parts on the same Intel Socket 2066 platform, but they target different corners of the market. The data shows a remarkably close performance contest, with the Core i9-9820X taking a narrow win in every Cinebench test, while the Xeon W-2150B counters with its workstation credentials. The practical choice comes down to whether you need the i9's unlocked multiplier or the Xeon's ECC memory support and extra PCIe lanes.

Where Each One Wins

The benchmark results are lopsided in terms of raw scores. The Core i9-9820X wins all six head-to-head Cinebench tests, but the margins are consistently thin, ranging from 0.5% to 0.8%. In Cinebench R15 multicore, the i9 scores 1759 versus 1750 for the Xeon, a 0.5% edge. The single-core R15 test shows the i9 at 248 against 246, a 0.8% advantage. The pattern repeats across R20 and R23, with the i9 holding a 0.5% lead in both multicore and single-core runs. These are not decisive victories; they are within the noise of typical run-to-run variation. The i9's wins suggest a slight clock-for-clock efficiency edge, but no workload would feel meaningfully faster on one versus the other.

The Xeon W-2150B, despite losing every benchmark, wins in the feature department. It supports ECC memory, a critical feature for data integrity in server and workstation environments. It also offers 48 PCIe Gen 3 lanes from the CPU, compared to 44 on the i9. The Xeon's die size is listed at 484 mm², which is not a performance metric but points to a physically larger chip. The i9 has a higher base clock (3.30 GHz vs 3.00 GHz) but a lower boost clock (4.20 GHz vs 4.50 GHz). The Xeon's higher boost clock does not translate into benchmark wins, likely due to power or thermal constraints. The i9 also has more L3 cache at 16.5 MB shared versus 13.75 MB shared on the Xeon.

Architecture Differences

Both CPUs are built on Intel's 14 nm process and share the Skylake architecture, but they come from different sub-families. The i9-9820X is part of the Skylake-X line, classified as Core i9 X-Series 9th Gen, while the Xeon W-2150B is Skylake-W, a workstation-focused variant. The core counts are identical at 10 cores and 20 threads, and both have 64 KB of L1 cache per core and 1 MB of L2 cache per core. The L3 cache differs: 16.5 MB shared on the i9 versus 13.75 MB shared on the Xeon. That 2.75 MB difference is small but could favor the i9 in cache-sensitive workloads.

The memory controllers are identical on paper: both support DDR4 with quad-channel memory and 85.3 GB/s bandwidth. The critical divergence is ECC memory support, which is present on the Xeon but absent on the i9. The Xeon also has more PCIe lanes (48 vs 44), both Gen 3. The i9 has an unlocked multiplier, enabling overclocking, while the Xeon is locked. The Xeon's TDP is lower at 120 W versus 165 W for the i9, which means the Xeon should be easier to cool in a workstation chassis despite its higher boost clock. The Xeon's die size is listed at 484 mm², while the i9's is not provided.

The Xeon W-2150B was released on 2017-12-20, roughly ten months before the i9-9820X on 2018-10-18. Both are end-of-life products. The i9 carries a launch MSRP of $889; the Xeon has no listed launch MSRP. The Xeon's part number is SR3LS, and the i9's is SREZ8. The Xeon is classified as a Server/Workstation part, while the i9 is Desktop. The i9 has a 60th percentile ranking among all CPUs, and the Xeon sits at 59th, reflecting their near-identical average benchmark scores of 5049 and 4992, respectively.

The Verdict

The data points to a clear decision framework. If you are building a desktop system and want the flexibility to overclock, the Intel Core i9-9820X is the pick. It wins every Cinebench test in this comparison, has a higher base clock, more L3 cache, and an unlocked multiplier. The 0.5% to 0.8% performance deltas are negligible in real-world use, but the overclocking headroom on the i9 could widen that gap if you push it. The i9's lower PCIe lane count (44 vs 48) is unlikely to matter for a single-GPU desktop.

If you are building a workstation or server where data integrity and expansion matter more than raw single-thread speed, the Intel Xeon W-2150B is the better choice. It supports ECC memory, which the i9 lacks entirely. It also offers four additional PCIe Gen 3 lanes, which can matter for multiple NVMe drives or professional I/O cards. The Xeon's lower TDP of 120 W versus 165 W means less heat output, which is a real advantage in a dense workstation. The fact that it loses all benchmarks by less than 1% makes the ECC and PCIe advantages essentially free in performance terms. The Xeon's higher boost clock of 4.50 GHz does not help it win any test, so do not choose it for that reason.

Neither CPU is a clear winner for pure performance. The i9-9820X is the better desktop part because of the unlocked multiplier and slightly higher scores. The Xeon W-2150B is the better workstation part because of ECC and PCIe capacity. The 10-core/20-thread count is identical, so multi-threaded workloads see no core-count advantage either way. The i9's 16.5 MB of L3 cache versus 13.75 MB on the Xeon is the only meaningful architectural edge for the i9, and it does not show up as a significant benchmark delta.

FAQ

Q: Which CPU has better multi-core performance?

A: The Intel Core i9-9820X wins all three multi-core Cinebench tests. It scores 1759 vs 1750 in R15, 7332 vs 7294 in R20, and 17459 vs 17368 in R23. Each win is a 0.5% margin.

Q: Does the Xeon W-2150B support ECC memory?

A: Yes, the Xeon W-2150B has ECC memory support. The Intel Core i9-9820X does not support ECC memory.

Q: Are the CPUs on the same socket?

A: Yes, both use Intel Socket 2066. They also share the same Skylake architecture and 14 nm process node.

Q: Which CPU has a higher boost clock?

A: The Xeon W-2150B has a higher boost clock at 4.50 GHz, compared to 4.20 GHz on the i9-9820X. However, the i9 wins all single-core Cinebench tests anyway.

Q: Can I overclock the Xeon W-2150B?

A: No, the Xeon W-2150B has a locked multiplier. The i9-9820X has an unlocked multiplier, so it can be overclocked.

Q: Which CPU has more PCIe lanes?

A: The Xeon W-2150B offers 48 PCIe Gen 3 lanes from the CPU, while the i9-9820X offers 44 lanes. Both are Gen 3.

Head-to-Head Benchmarks

The entire benchmark comparison is a sweep for the Intel Core i9-9820X, but every victory is narrow. In Cinebench R15 multicore, the i9 scores 1759 against 1750 for the Xeon, a 0.5% delta. The R15 single-core test shows the i9 at 248 and the Xeon at 246, a 0.8% delta — the largest margin in the entire comparison. Moving to R20, the i9 wins multicore 7332 to 7294 (0.5%) and single-core 1034 to 1029 (0.5%). In R23, the i9 takes multicore 17459 to 17368 (0.5%) and single-core 2464 to 2452 (0.5%). The Xeon's higher boost clock of 4.50 GHz does not produce a single win, and its lower base clock of 3.00 GHz likely holds it back in sustained loads.

The average benchmark scores tell the same story. The i9-9820X has an average score of 5049, while the Xeon W-2150B sits at 4992. The i9's nearest rivals include the Intel Core i9-12900TE at a 0% delta and the Intel Xeon Gold 6334 at 0.1% behind. The Xeon's nearest rivals include the Intel Core i3-12300HE at -0.1% and the Intel Core i7-1375PRE at 0.1% ahead. Neither CPU is close to the top of the charts; the i9 sits at the 60th percentile of all CPUs and the Xeon at 59th. These are mid-pack performers in the broader market, but they are essentially tied with each other.

The only benchmark where the Xeon has data that the i9 does not is Geekbench, where the Xeon scores 8481 multicore and 1314 single-core. There is no equivalent Geekbench score for the i9 in the data, so no direct comparison is possible. The Cinebench results are the only true head-to-head data, and they all favor the i9 by a hair.

Specification Differences

The Intel Core i9-9820X and Intel Xeon W-2150B differ in several key specifications despite sharing the same core count and socket. The i9 has a base clock of 3.30 GHz, while the Xeon runs at 3.00 GHz. The boost clocks are reversed: the i9 tops out at 4.20 GHz, while the Xeon reaches 4.50 GHz. The i9's TDP is 165 W, significantly higher than the Xeon's 120 W. The i9 has 16.5 MB of shared L3 cache, while the Xeon has 13.75 MB. The i9 supports 44 PCIe Gen 3 lanes, while the Xeon supports 48. ECC memory is supported only on the Xeon. The i9 has an unlocked multiplier; the Xeon is locked. The Xeon's die size is 484 mm²; the i9's is not listed. The i9 is a Desktop part with a launch MSRP of $889; the Xeon is a Server/Workstation part with no listed launch MSRP. The i9 was released on 2018-10-18, and the Xeon on 2017-12-20. Both are end-of-life and use the same quad-channel DDR4 memory with 85.3 GB/s bandwidth.