Intel Core i9-9980HK vs Intel Xeon W-2135 Comparison

The Verdict

The data paints a remarkably consistent picture: the Intel Xeon W-2135 wins every single head-to-head benchmark in the comparison, taking all six tests with a uniform 3% margin in multi-core workloads and a 2.9% to 3% margin in single-core tests. The Core i9-9980HK, despite its mobile pedigree and 8-core/16-thread configuration, trails the 6-core/12-thread Xeon in every measured scenario. Neither chip escapes the middle of the pack — both sit at the 55th percentile among all CPUs, with the i9 averaging 3577 points across its benchmark suite and the Xeon averaging 3530. The Xeon's launch MSRP is $835. For a user choosing strictly from this data, the Xeon W-2135 is the unambiguous pick for raw compute performance, whether the workload is single-threaded or fully parallel. The i9-9980HK, however, is the only one of the two with integrated graphics and a 45W TDP, making it the sensible choice for compact, power-constrained systems where the Xeon's 140W envelope and lack of a built-in display output would be disqualifying. The data does not show any scenario where the i9 wins on speed, so the decision hinges entirely on form factor, power budget, and platform requirements rather than benchmark supremacy.

Where Each One Wins

The benchmark results are one-sided, but the underlying specifications reveal distinct territories. The Xeon W-2135 claims victory in all six Cinebench tests — R15, R20, and R23, both multi-core and single-core variants. Its smallest edge is 2.9% in Cinebench R15 single-core (173 vs 168), and its largest is a flat 3% across every multi-core test and the R20/R23 single-core runs. This consistency suggests the Xeon's higher base clock of 3.70 GHz and boost of 4.50 GHz, combined with a more generous 1 MB L2 cache per core, give it a fundamental per-thread advantage that the i9's higher 5.00 GHz boost clock cannot overcome. The i9-9980HK, meanwhile, wins on mobility: its 45W TDP is less than a third of the Xeon's 140W, it fits an Intel BGA 1440 socket rather than the Xeon's Socket 2066, and it includes UHD 630 integrated graphics where the Xeon has none. For a laptop or small-form-factor build that must handle occasional rendering without a discrete GPU, the i9 is the only viable option in this pairing. The Xeon counters with quad-channel DDR4 memory and 85.3 GB/s bandwidth — exactly double the i9's dual-channel 42.7 GB/s — plus ECC memory support, which the i9 lacks. For workstation workloads that stress memory throughput or demand error-correcting memory, the Xeon's platform advantages are decisive even beyond its benchmark wins.

Architecture Differences

The two chips come from different Intel design lineages. The i9-9980HK is built on Coffee Lake-HR, a 14 nm mobile architecture, with a die size of 149 mm². The Xeon W-2135 uses Skylake-W, also 14 nm but a much larger 484 mm² die — a reflection of its workstation/server heritage. Core counts differ: 8 cores and 16 threads for the i9 versus 6 cores and 12 threads for the Xeon. Cache layouts diverge significantly. The i9 has 64 KB L1 and 256 KB L2 per core, with a 16 MB shared L3. The Xeon has the same 64 KB L1 per core but quadruples the L2 to 1 MB per core, while its shared L3 is smaller at 8.25 MB. This suggests the Xeon prioritizes per-core local data retention, which helps explain its consistent single-core wins despite a lower boost clock. Memory architecture is a major split: the i9 uses dual-channel DDR4 with 42.7 GB/s bandwidth and no ECC support; the Xeon uses quad-channel DDR4 with 85.3 GB/s and full ECC support. PCIe also differs — the Xeon provides Gen 3 with 48 lanes from the CPU, while the i9 only states Gen 3 without a lane count. The i9 has an unlocked multiplier and integrated UHD 630 graphics; the Xeon has neither. Both are end-of-life and share the same 14 nm process node and Intel foundry, but their sockets are incompatible: BGA 1440 for the i9, Socket 2066 for the Xeon.

FAQ

Q: Which processor has more cores and threads?

A: The Intel Core i9-9980HK has 8 cores and 16 threads, while the Intel Xeon W-2135 has 6 cores and 12 threads. Despite having fewer cores, the Xeon wins every multi-core benchmark in the comparison.

Q: Does the Xeon W-2135 support ECC memory?

A: Yes, the Xeon W-2135 supports ECC memory and uses quad-channel DDR4 with 85.3 GB/s bandwidth. The Core i9-9980HK does not support ECC and uses dual-channel DDR4 with 42.7 GB/s bandwidth.

Q: Which processor includes integrated graphics?

A: Only the Core i9-9980HK includes integrated graphics, specifically an Intel UHD 630. The Xeon W-2135 has no integrated graphics, requiring a discrete GPU for display output.

Q: How large is the performance gap in multi-core Cinebench R23?

A: The Xeon W-2135 scores 12205 in Cinebench R23 multi-core, while the i9-9980HK scores 11836. The Xeon leads by 3%, which is the same margin seen in R15 and R20 multi-core tests.

Q: What are the TDP values for each processor?

A: The Core i9-9980HK has a TDP of 45W, while the Xeon W-2135 has a TDP of 140W. This makes the i9 substantially more power-efficient and suitable for mobile or compact systems.

Q: Which processor has a higher boost clock?

A: The Core i9-9980HK has a boost clock of 5.00 GHz, which is higher than the Xeon W-2135's 4.50 GHz. However, the Xeon still wins all single-core benchmarks in the comparison, indicating other factors like per-core cache play a larger role.

Head-to-Head Benchmarks

The head-to-head data is striking in its uniformity. Across six Cinebench tests, the Xeon W-2135 wins every time, and the margins are almost identical. In multi-core tests, the Xeon leads by exactly 3% in all three generations: 1230 vs 1193 in R15, 5126 vs 4971 in R20, and 12205 vs 11836 in R23. The single-core results tell the same story with only a slight variation. In R15 single-core, the Xeon scores 173 against the i9's 168, a 2.9% advantage. In R20 single-core, the Xeon posts 723 versus 701, a 3% edge. In R23 single-core, the Xeon hits 1723 versus 1671, again a 3% lead. The consistency of these deltas — never straying from the 2.9% to 3% band — suggests a fixed architectural advantage rather than workload-dependent behavior. The i9's higher boost clock of 5.00 GHz does not translate into any single-core victory; the Xeon's 4.50 GHz boost, combined with its 1 MB L2 cache per core, appears to deliver more effective per-thread throughput. The i9's 16 MB L3 cache versus the Xeon's 8.25 MB does not close the gap either, even in multi-core tests where the i9's two extra cores should theoretically provide a parallel advantage. The Xeon's quad-channel memory bandwidth (85.3 GB/s) versus the i9's dual-channel (42.7 GB/s) likely contributes to the multi-core results, as memory-bound rendering workloads benefit from the doubled bandwidth. The data shows no benchmark where the i9 even ties — the Xeon's smallest win is 2.9%, and its largest is 3%. For users looking at raw Cinebench scores, the Xeon W-2135 is the clear performer, and the i9-9980HK's additional cores and higher boost clock do not overcome the Xeon's per-core efficiency and memory throughput.

Specification Differences

The two processors differ on nearly every major specification except for process node (both 14 nm), foundry (Intel), and L1 cache (64 KB per core for both). Core and thread counts: the i9 has 8 cores and 16 threads, while the Xeon has 6 cores and 12 threads. Clock speeds: the i9 runs at 2.40 GHz base and 5.00 GHz boost; the Xeon runs at 3.70 GHz base and 4.50 GHz boost. TDP: the i9 draws 45W versus the Xeon's 140W. Socket: the i9 uses Intel BGA 1440, the Xeon uses Intel Socket 2066. Architecture and codename: the i9 is Coffee Lake with the Coffee Lake-HR codename, while the Xeon is Skylake with the Skylake-W codename. Die size: the i9 measures 149 mm², the Xeon 484 mm². L2 cache: the i9 has 256 KB per core, the Xeon has 1 MB per core. L3 cache: the i9 has 16 MB shared, the Xeon has 8.25 MB shared. Memory bus: the i9 is dual-channel, the Xeon is quad-channel. Memory bandwidth: the i9 offers 42.7 GB/s, the Xeon 85.3 GB/s. ECC memory: the i9 does not support it, the Xeon does. PCIe: both are Gen 3, but the Xeon specifies 48 lanes from the CPU while the i9 gives no lane count. Integrated graphics: the i9 has UHD 630, the Xeon has none. Market segment: the i9 is mobile, the Xeon is server/workstation. The i9 has an unlocked multiplier, the Xeon does not. Release dates differ: the i9 launched in April 2019, the Xeon in August 2017. The i9's part number is SRFD0, the Xeon's is SR3LN. The Xeon has a launch MSRP of $835, while the i9 has no listed launch MSRP.