Intel Core i9-9900KS vs Intel Xeon W-1290E Comparison

The Intel Xeon W-1290E and Intel Core i9-9900KS are two 14 nm Intel parts that deliver nearly identical application performance despite very different positioning. The Xeon W-1290E wins every shared benchmark, but by a margin so slim that it is effectively a statistical tie. The deciding factors are not raw speed but platform features, power envelopes, and lifecycle status.

Head-to-Head Benchmarks

The benchmark data shows a clean sweep for the Xeon W-1290E, though the margins are razor-thin. Across all six Cinebench tests, the Xeon wins with a deltaPct of exactly 0.4%. In Cinebench R23 multi-core, the Xeon scores 16510 against the i9-9900KS’s 16446. That 64-point gap represents a 0.4% advantage. The single-core R23 result is similarly close: 2330 versus 2321.

The pattern holds in older Cinebench versions. In R20 multi-core, the Xeon posts 6934 versus 6907, a 27-point edge. In R20 single-core, it is 978 versus 974. The R15 results are even tighter: 1664 versus 1657 multi-core, and 234 versus 233 single-core. In every case, the Xeon’s advantage is 0.4%, which is within run-to-run variance for most workloads.

What is notable is the absence of any countervailing win for the Core i9-9900KS. The head-to-head data records 6 wins for the Xeon and 0 for the i9. The i9 does have additional benchmarks in its own result set — 3DMark and Geekbench scores — but those tests were not run on the Xeon, so no direct comparison is available. From the shared data, the Xeon is ahead everywhere.

The average benchmark scores tell a similar story. The Xeon W-1290E averages 4775 across its benchmark suite, while the i9-9900KS averages 4738. That 37-point difference (roughly 0.8%) places the Xeon marginally higher. Both CPUs sit at the 59th percentile among all tested processors. The i9’s nearest rival list includes the Xeon itself, with a deltaPct of -0.8%, confirming that the two are essentially peers in aggregate performance.

FAQ

Q: Which CPU is faster in multi-threaded workloads?

The Intel Xeon W-1290E wins every multi-core Cinebench test. In R23 multi-core, it scores 16510 versus 16446 for the Core i9-9900KS, a 0.4% advantage. The same 0.4% delta appears in R20 (6934 vs 6907) and R15 (1664 vs 1657).

Q: How do the single-core results compare?

The Xeon also leads single-core tests, but by the same tiny margin. Cinebench R23 single-core shows 2330 for the Xeon versus 2321 for the i9. R20 single-core is 978 versus 974, and R15 single-core is 234 versus 233.

Q: Do the two CPUs have the same average performance?

Not exactly. The Xeon W-1290E has an average benchmark score of 4775, while the Core i9-9900KS averages 4738. The Xeon is about 0.8% higher on average, and both rank at the 59th percentile of all CPUs.

Q: Why does the Xeon have more cores but similar performance to the 8-core i9?

The Xeon has 10 cores and 20 threads, while the i9 has 8 cores and 16 threads. However, the i9 compensates with a higher base clock of 4.00 GHz and boost clock of 5.00 GHz, versus 3.50 GHz and 4.80 GHz for the Xeon. The extra cores add throughput, but the i9’s clock advantage narrows the gap.

Q: Which CPU supports ECC memory?

Only the Intel Xeon W-1290E supports ECC memory. The Core i9-9900KS does not list ECC as a feature. This is a key differentiator for workstation or server builds where data integrity is critical.

Q: Which socket does each CPU use?

The Xeon W-1290E uses Intel Socket 1200, while the Core i9-9900KS uses Intel Socket 1151. They are not socket-compatible, so motherboard choice is determined by the CPU.

Architecture Differences

Both processors are built on Intel’s 14 nm process and share the same per-core L1 cache at 64 KB and L2 cache at 256 KB. The differences begin with the core counts and die sizes. The Xeon W-1290E has 10 cores and 20 threads on a 206 mm² die, while the Core i9-9900KS has 8 cores and 16 threads on a smaller 180 mm² die. The Xeon’s larger die accommodates two additional cores and a larger shared L3 cache.

The L3 cache is a significant distinction. The Xeon offers 20 MB of shared L3, whereas the i9 provides 16 MB. This 25% cache advantage aligns with the Xeon’s extra cores. Clock speeds favor the i9: the 9900KS has a 4.00 GHz base and 5.00 GHz boost, compared to the Xeon’s 3.50 GHz base and 4.80 GHz boost. The i9 also carries a 127 W TDP against the Xeon’s 95 W, which is counterintuitive given the Xeon’s higher core count — the i9’s higher clocks demand more power.

Memory support differs in bandwidth and ECC capability. The Xeon supports dual-channel DDR4 with 46.9 GB/s bandwidth and ECC memory. The i9 also supports dual-channel DDR4 but at a lower 42.7 GB/s, and it lacks ECC. Both use PCIe Gen 3 with 16 lanes from the CPU. Integrated graphics differ slightly: the Xeon has Intel UHD Graphics P630, while the i9 has UHD 630. The Xeon’s generation is listed as Comet Lake, the i9’s as Coffee Lake Refresh. The Xeon is a server/workstation part, while the i9 is a desktop part. The i9 has an unlocked multiplier for overclocking; the Xeon does not.

The Verdict

The data points to a clear conclusion: pick the Intel Xeon W-1290E if you need ECC memory, more cores, or a currently produced workstation processor. It wins every shared benchmark, offers 10 cores versus 8, has 20 MB of L3 cache versus 16 MB, and supports ECC memory. Its 95 W TDP is lower than the i9’s 127 W, and its memory bandwidth is higher at 46.9 GB/s versus 42.7 GB/s.

The Core i9-9900KS is the choice only if you prioritize the highest possible clock speeds and overclocking. It boosts to 5.00 GHz, has a 4.00 GHz base clock, and comes with an unlocked multiplier. It is also end-of-life, while the Xeon is still active. For raw multi-threaded throughput, the Xeon’s 0.4% lead in Cinebench is real but negligible. For single-thread responsiveness, the i9’s clock advantage does not translate into a win in the shared benchmarks — the Xeon actually leads single-core Cinebench too.

The i9’s only unique strengths are its unlocked multiplier and slightly lower launch MSRP of $513 versus the Xeon’s $552. If overclocking is not part of the plan, the Xeon’s additional cores, larger cache, ECC support, and active production status make it the more defensible purchase.

Specification Differences

The following specifications differ between the two CPUs:

• Cores: 10 (Xeon W-1290E) vs 8 (Core i9-9900KS)
• Threads: 20 vs 16
• Base Clock: 3.50 GHz vs 4.00 GHz
• Boost Clock: 4.80 GHz vs 5.00 GHz
• TDP: 95 W vs 127 W
• Socket: Intel Socket 1200 vs Intel Socket 1151
• Architecture: Comet Lake vs Coffee Lake
• Die Size: 206 mm² vs 180 mm²
• L3 Cache: 20 MB vs 16 MB
• Memory Bandwidth: 46.9 GB/s vs 42.7 GB/s
• ECC Memory: Supported vs Not supported
• Integrated Graphics: Intel UHD Graphics P630 vs UHD 630
• Market Segment: Server/Workstation vs Desktop
• Production Status: Active vs End-of-life
• Release Date: 2020-05-12 vs 2019-10-27
• Launch MSRP: $552 vs $513
• Multiplier Unlocked: No vs Yes

Where Each One Wins

The Intel Xeon W-1290E wins in every benchmark category where both were tested. It leads Cinebench R15, R20, and R23 in both single-core and multi-core modes. The margins are uniformly 0.4%, but a win is a win. The Xeon’s 10 cores and 20 threads provide more parallel processing headroom, which is reflected in its higher multi-core scores. Its 20 MB L3 cache gives it a larger working set for cache-sensitive workloads. The ECC memory support makes it the only choice for error-correcting memory configurations. The Xeon’s active production status means it remains available for new builds, and its 95 W TDP makes it more power-efficient despite the extra cores.

The Intel Core i9-9900KS wins in areas not covered by the shared benchmarks. It has a 5.00 GHz boost clock versus 4.80 GHz, and a 4.00 GHz base clock versus 3.50 GHz. Its unlocked multiplier allows manual overclocking, which the Xeon cannot do. It is a desktop part with a lower launch MSRP of $513. In the shared Cinebench tests, the i9 does not win a single one, but its clock speed advantage would likely show in lightly threaded or latency-sensitive applications that are not represented in this data set.

For a workstation or server build requiring ECC memory and sustained multi-threaded performance, the Xeon W-1290E is the clear winner. For an enthusiast desktop build where overclocking and maximum clock speeds are the priority, the Core i9-9900KS holds that niche — provided the user accepts its end-of-life status and higher TDP.