Intel Core i7-7820HK vs Intel Xeon W-2123 Comparison

Where Each One Wins

The benchmark data splits cleanly in favor of the Intel Xeon W-2123 across every recorded test. Both processors share the same 4-core, 8-thread configuration, but the Xeon W-2123 wins all six head-to-head Cinebench comparisons with a consistent margin between 13.9% and 14.6%. This is not a case of one chip edging out the other in a single workload class; the advantage holds across single-core and multi-core tests alike, across three different Cinebench versions (R15, R20, R23).

The Intel Core i7-7820HK, by contrast, does not win a single head-to-head benchmark in the database. Its only recorded wins come in Geekbench tests, which are not part of the head-to-head set, and even there the scores (4173 multi-core, 1273 single-core) are standalone figures without a direct Xeon W-2123 comparison. For users looking at raw Cinebench performance, the Xeon W-2123 is the clear choice in every scenario.

The use-case split therefore rests on factors other than benchmark scores. The Xeon W-2123 targets server and workstation deployments, with ECC memory support, quad-channel DDR4, and 48 PCIe Gen 3 lanes. The i7-7820HK targets mobile systems, with a 45 W TDP, dual-channel memory, and integrated Intel HD Graphics 630. If the workload demands error-correcting memory or high PCIe lane count, the Xeon W-2123 is the only option. If the requirement is low power consumption in a compact mobile chassis, the i7-7820HK fits that niche despite its lower benchmark scores.

FAQ

Q: Which processor has a higher average benchmark score?

A: The Intel Xeon W-2123 has an average benchmark score of 2079, while the Intel Core i7-7820HK averages 2048. The difference is approximately 1.5%, placing both at the 46th percentile among all CPUs.

Q: How much faster is the Xeon W-2123 in multi-core Cinebench R23?

A: The Xeon W-2123 scores 7189 in Cinebench R23 multi-core, compared to 6306 for the i7-7820HK. That is a 14% advantage for the Xeon.

Q: Does the i7-7820HK have any benchmark where it outperforms the Xeon W-2123?

A: No. In the six head-to-head Cinebench tests, the Xeon W-2123 wins all of them. The i7-7820HK does have Geekbench scores (4173 multi-core, 1273 single-core), but the database does not include corresponding Xeon W-2123 Geekbench results for comparison.

Q: What are the memory support differences?

A: The Xeon W-2123 supports DDR4 with a quad-channel bus and 85.3 GB/s memory bandwidth, and it supports ECC memory. The i7-7820HK supports both DDR3 and DDR4 with a dual-channel bus, has no recorded memory bandwidth figure, and does not support ECC.

Q: Which processor has more PCIe lanes?

A: The Xeon W-2123 provides 48 PCIe Gen 3 lanes (CPU only), while the i7-7820HK provides 16 PCIe Gen 3 lanes (CPU only). The Xeon offers three times the lane count.

Q: Is the i7-7820HK overclockable?

A: Yes. The i7-7820HK has an unlocked multiplier, whereas the Xeon W-2123 does not.

Head-to-Head Benchmarks

The head-to-head data shows a uniform pattern: the Xeon W-2123 leads by roughly 14% in every multi-core test and by a slightly higher margin in single-core tests. In Cinebench R15 multi-core, the Xeon scores 724 against 635 for the i7-7820HK, a 14% advantage. The single-core R15 result is 102 versus 89, a 14.6% lead, which is the largest delta in the entire comparison.

Moving to Cinebench R20, the Xeon W-2123 posts 3019 multi-core and 425 single-core, versus 2648 and 373 for the i7-7820HK. The multi-core delta is again 14%, while the single-core delta is 13.9%. The pattern repeats in Cinebench R23: the Xeon scores 7189 multi-core and 1014 single-core, against 6306 and 890 for the i7-7820HK, with deltas of 14% and 13.9% respectively.

What is notable is the consistency. Across six tests spanning three Cinebench generations, the margin never drops below 13.9% and never exceeds 14.6%. This suggests a fundamental clock-speed and architectural advantage rather than a workload-specific quirk. The Xeon W-2123 has a base clock of 3.60 GHz versus 2.90 GHz for the i7-7820HK, although both boost to 3.90 GHz. The lower base clock of the mobile chip likely explains the single-core deficit, while the multi-core deficit may also reflect thermal and power constraints in the mobile form factor.

The i7-7820HK does have Geekbench results in the database, with a multi-core score of 4173 and single-core score of 1273. These are not directly compared to the Xeon W-2123 in the head-to-head set, so no delta percentage is available. However, the average benchmark score for the i7-7820HK (2048) sits only 1.5% below the Xeon W-2123 (2079), indicating that the Geekbench results partially offset the Cinebench gap in the overall average.

Specification Differences

The two processors differ in several specification areas beyond their benchmark scores. The Xeon W-2123 has a base clock of 3.60 GHz, the i7-7820HK a base clock of 2.90 GHz. Both share the same 3.90 GHz boost clock and the same 4-core, 8-thread configuration. The TDP differs substantially: the Xeon is rated at 120 W, the i7-7820HK at 45 W. This reflects their different market segments, workstation versus mobile.

The socket types are incompatible. The Xeon W-2123 uses Intel Socket 2066, while the i7-7820HK uses Intel BGA 1440, a soldered mobile package. The cache hierarchy also differs: the Xeon has 1 MB of L2 cache per core and 8.25 MB of shared L3 cache, while the i7-7820HK has 256 KB of L2 cache per core and 8 MB of shared L3 cache. The L1 cache is identical at 64 KB per core.

Memory support diverges sharply. The Xeon W-2123 supports DDR4 with a quad-channel bus and a recorded memory bandwidth of 85.3 GB/s, plus ECC memory. The i7-7820HK supports DDR3 and DDR4 with a dual-channel bus, has no recorded memory bandwidth figure, and does not support ECC. PCIe lane counts also differ: the Xeon provides 48 Gen 3 lanes, the i7-7820HK provides 16 Gen 3 lanes.

The i7-7820HK includes integrated Intel HD Graphics 630, while the Xeon W-2123 has no integrated graphics. The i7-7820HK has an unlocked multiplier; the Xeon does not. The die sizes reflect their respective architectures: the Xeon W-2123 has a 484 mm² die, the i7-7820HK a 126 mm² die. Both are built on a 14 nm process at Intel's foundry.

Architecture Differences

The architectural split is straightforward: the Xeon W-2123 is based on Skylake-W, while the i7-7820HK is based on Kaby Lake-H. Both are 14 nm parts from Intel, but they target different platforms and design goals.

Skylake-W is derived from the server and workstation lineage, which explains the large 484 mm² die, the quad-channel memory controller, and the 48 PCIe lanes. The larger die accommodates the additional memory channels and PCIe connectivity, even though the core count is the same as the mobile chip. The Xeon also carries the Skylake-W codename and belongs to the Xeon W generation, with a production status of end-of-life and a release date of August 2017.

Kaby Lake-H is a mobile-focused architecture, evidenced by the 126 mm² die, the dual-channel memory controller, and the 16 PCIe lanes. The smaller die allows for lower power consumption, fitting the 45 W TDP. The i7-7820HK includes integrated graphics, a feature absent from the Xeon W-2123, which is typical for mobile parts that need to drive displays without a discrete GPU. The i7-7820HK was released in January 2017, a few months earlier than the Xeon W-2123.

The cache architecture also differs. The Xeon W-2123 uses a larger per-core L2 cache of 1 MB, whereas the i7-7820HK uses 256 KB per core. The L3 cache is nearly identical (8.25 MB versus 8 MB), but the L2 disparity suggests different design priorities. The Xeon's larger L2 may help with workstation workloads that rely on repeated data access, while the mobile chip's smaller cache saves die area and power.

The memory controller difference is a direct consequence of the architecture split. The Xeon's quad-channel DDR4 support with 85.3 GB/s bandwidth is a workstation-class feature, while the i7-7820HK's dual-channel DDR3/DDR4 support is more typical of mobile platforms. ECC support on the Xeon further reinforces its server/workstation positioning.

The Verdict

The data points to a clear performance hierarchy: the Intel Xeon W-2123 is faster in every head-to-head benchmark, with a consistent 14% advantage across multi-core tests and a 13.9% to 14.6% advantage in single-core tests. It also offers ECC memory support, quad-channel DDR4, 48 PCIe lanes, and a larger L2 cache. For anyone building a workstation or server system where these features matter, the Xeon W-2123 is the superior choice based on the recorded measurements.

The Intel Core i7-7820HK is not without its own merits, but they lie outside the benchmark data. Its 45 W TDP makes it suitable for mobile systems where power consumption is critical. The unlocked multiplier allows overclocking, and the integrated Intel HD Graphics 630 removes the need for a separate GPU in basic display scenarios. It also supports DDR3 memory, which may be relevant for older system designs.

The choice between these two processors should be driven by platform requirements rather than raw performance. The Xeon W-2123 wins every recorded benchmark and offers workstation-class memory and I/O features. The i7-7820HK offers lower power consumption, integrated graphics, and an unlocked multiplier, but it loses every head-to-head comparison in the database. If the workload fits a mobile platform with modest power budgets, the i7-7820HK is the only one of the two that fits that socket and form factor. If the workload demands ECC, quad-channel memory, high PCIe lane counts, or maximum Cinebench scores, the Xeon W-2123 is the clear winner.