Intel Core i9-9990XE vs Intel Xeon Platinum 8260 Comparison

Where Each One Wins

The Intel Core i9-9990XE wins every single benchmark in the head-to-head comparison. Across all six Cinebench tests, the i9-9990XE records higher scores than the Xeon Platinum 8260, with deltas ranging from 6.0% to 6.1%. This consistency is notable: regardless of whether the workload is single-threaded or multi-threaded, the desktop part finishes ahead by nearly the same margin.

The Xeon Platinum 8260 does not win a single recorded test. Even in multi-core workloads, where its 24 cores and 48 threads should give it a structural advantage over the 14-core, 28-thread i9-9990XE, the Xeon posts lower scores. In Cinebench R23 multi-core, the i9-9990XE scores 25,637 versus the Xeon's 24,173, a 6.1% deficit for the server chip. The story is identical in single-core tests: the i9-9990XE leads by 6.1% in R23 single-core, 3,619 versus 3,412.

The use-case split is therefore not about which chip wins, but about what each chip offers beyond raw Cinebench scores. The i9-9990XE is a desktop part with an unlocked multiplier and a 5.10 GHz boost clock. The Xeon Platinum 8260 is a server/workstation part with ECC memory support and a locked multiplier. For workloads that demand ECC memory or server-grade validation, the Xeon has a purpose that benchmark scores alone do not capture. For pure Cinebench throughput, the i9-9990XE is the clear leader in every recorded scenario.

Architecture Differences

Both processors are built on Intel's 14 nm process node and share the same 64 KB L1 and 1 MB L2 cache per core. The similarities end there. The i9-9990XE uses the Skylake-X architecture under the Skylake codename, part of the Core i9 Extreme (X-Series 9th Gen) family. It has 14 cores and 28 threads, a 4.00 GHz base clock, and a 5.10 GHz boost clock. The Xeon Platinum 8260 uses the Cascade Lake architecture under the Cascade Lake-SP codename, part of the Xeon Platinum family. It has 24 cores and 48 threads, a 2.40 GHz base clock, and a 3.90 GHz boost clock.

The Xeon has substantially more L3 cache: 35.75 MB shared versus 19.25 MB shared for the i9-9990XE. It also carries 8,000 million transistors, a figure not listed for the i9-9990XE. The sockets differ completely: the i9-9990XE sits in Intel Socket 2066, while the Xeon Platinum 8260 uses Intel Socket 3647. These are physically incompatible platforms.

Memory support also divides the two. The i9-9990XE supports DDR4 memory with a quad-channel bus and a recorded memory bandwidth of 85.3 GB/s, but it does not support ECC memory. The Xeon Platinum 8260 supports DDR4 memory with ECC enabled, though its memory bus width and memory bandwidth are not recorded in the database. The i9-9990XE has an unlocked multiplier, making it a candidate for overclocking, while the Xeon Platinum 8260 has a locked multiplier. The i9-9990XE also lists PCIe Gen 3 with 44 lanes (CPU only), while the Xeon's PCIe configuration is not recorded. The i9-9990XE is marked end-of-life, while the Xeon's production status is not listed.

FAQ

Q: Which processor has more cores and threads?

A: The Intel Xeon Platinum 8260 has 24 cores and 48 threads, while the Intel Core i9-9990XE has 14 cores and 28 threads.

Q: Which processor has the higher boost clock?

A: The Intel Core i9-9990XE has a 5.10 GHz boost clock, well above the Xeon Platinum 8260's 3.90 GHz boost clock.

Q: Does the Xeon Platinum 8260 support ECC memory?

A: Yes, the Xeon Platinum 8260 supports ECC memory. The Intel Core i9-9990XE does not.

Q: Which processor has more L3 cache?

A: The Intel Xeon Platinum 8260 has 35.75 MB of shared L3 cache, while the Intel Core i9-9990XE has 19.25 MB of shared L3 cache.

Q: Can the Intel Core i9-9990XE be overclocked?

A: The i9-9990XE has an unlocked multiplier, indicating overclocking support. The Xeon Platinum 8260 has a locked multiplier.

Q: Which processor has the higher average benchmark score?

A: The Intel Core i9-9990XE has an average benchmark score of 7,415, while the Xeon Platinum 8260 has an average benchmark score of 6,992.

Specification Differences

The two processors differ in nearly every major specification category. The i9-9990XE uses 14 cores and 28 threads, while the Xeon Platinum 8260 uses 24 cores and 48 threads. Base clocks are 4.00 GHz versus 2.40 GHz, and boost clocks are 5.10 GHz versus 3.90 GHz, both favoring the i9-9990XE. Thermal design power moves in the opposite direction: the i9-9990XE is rated at 255 W, while the Xeon Platinum 8260 is rated at 165 W.

The sockets are incompatible: Intel Socket 2066 for the i9-9990XE, Intel Socket 3647 for the Xeon. The architectures differ as Skylake-X versus Cascade Lake-SP. L3 cache favors the Xeon at 35.75 MB shared versus 19.25 MB shared. The Xeon has 8,000 million transistors; the i9-9990XE has no transistor count recorded.

Memory configuration separates the two further. The i9-9990XE has a quad-channel memory bus with 85.3 GB/s bandwidth and no ECC support. The Xeon Platinum 8260 has ECC support, but its memory bus and bandwidth are not recorded. PCIe also differs: the i9-9990XE lists Gen 3 with 44 lanes (CPU only), while the Xeon has no PCIe data recorded. The multiplier is unlocked on the i9-9990XE and locked on the Xeon.

Release timing is close: the i9-9990XE released on 2018-10-18, and the Xeon Platinum 8260 released on 2018-12-10. The i9-9990XE is a desktop part marked end-of-life with a launch MSRP of $2800. The Xeon Platinum 8260 is a server/workstation part with no launch MSRP recorded. Part numbers are SREZA for the i9-9990XE and SRF9HCD8069504201101 for the Xeon.

Head-to-Head Benchmarks

The head-to-head data shows a uniform sweep. In Cinebench R15 multi-core, the i9-9990XE scores 2,584 against the Xeon's 2,436, a 6.1% advantage. In R15 single-core, the i9-9990XE scores 364 against 343, again 6.1% ahead. The same 6.1% delta appears in Cinebench R20 multi-core, where the i9-9990XE posts 10,767 against 10,152. R20 single-core narrows the gap slightly to 6.0%, with scores of 1,519 and 1,433.

Cinebench R23 repeats the pattern. Multi-core shows 25,637 for the i9-9990XE versus 24,173 for the Xeon, a 6.1% lead. Single-core shows 3,619 versus 3,412, also 6.1%. The consistency of the delta across three different Cinebench versions and both single and multi-threaded tests suggests the i9-9990XE's advantage is structural, not workload-specific. Higher clock speeds at 4.00 GHz base and 5.10 GHz boost, combined with the same 14 nm process node, allow the smaller-core i9-9990XE to outpace the Xeon's larger core count.

The Xeon's best result relative to the i9-9990XE is in R20 single-core, where it trails by 6.0% instead of 6.1%. That is a negligible difference, essentially within the noise of the recorded deltas. The average benchmark scores reflect the same ordering: the i9-9990XE averages 7,415 versus the Xeon's 6,992. Both parts sit at the 63rd percentile among all CPUs in the database, meaning their overall standing relative to the full CPU population is identical, even though the i9-9990XE leads the direct comparison.

The nearest rivals for each chip provide context. The i9-9990XE sits within 0.7% of the Intel Core i5-4570 (7,421 average score, -0.1% delta), the AMD EPYC 7282 (7,409, 0.1%), the Intel Core i9-9980XE (7,398, 0.2%), and the Intel Core i5-7400 (7,469, -0.7%). The Xeon Platinum 8260 sits within 0.9% of the Intel Pentium Gold G6400 (6,969, 0.3%), the Intel Core i9-7980XE (7,018, -0.4%), the Intel Core i9-9960X (6,938, 0.8%), and the AMD Ryzen 3 3200G (6,931, 0.9%). The i9-9990XE's nearest rivals cluster around higher average scores, while the Xeon's cluster around lower ones.

The Verdict

The benchmark data is unambiguous. The Intel Core i9-9990XE outperforms the Intel Xeon Platinum 8260 in every recorded Cinebench test, with a consistent 6.0% to 6.1% margin. Anyone choosing strictly on multi-threaded Cinebench throughput should pick the i9-9990XE, even though it has 10 fewer cores and 20 fewer threads. The Xeon's 24 cores cannot compensate for its lower 2.40 GHz base clock and 3.90 GHz boost clock.

The Xeon Platinum 8260 has its own case, but it is not built on benchmark scores. It supports ECC memory, which the i9-9990XE does not. It carries more L3 cache at 35.75 MB versus 19.25 MB, and it has a lower 165 W TDP against the i9-9990XE's 255 W. It is a server/workstation part with a locked multiplier, designed for platforms where ECC memory and stability take priority over raw clock speed. The i9-9990XE is a desktop part with an unlocked multiplier, a 5.10 GHz boost clock, and quad-channel DDR4 with 85.3 GB/s of bandwidth.

For a desktop workstation focused on Cinebench-class rendering workloads, the i9-9990XE is the better choice on every recorded metric. For a server environment requiring ECC memory and a 24-core, 48-thread configuration, the Xeon Platinum 8260 is the appropriate pick, despite its lower benchmark scores. The production status of the Xeon is not listed, while the i9-9990XE is marked end-of-life, which may matter for long-term procurement decisions. Both processors occupy the 63rd percentile among all CPUs, but in a direct head-to-head, the i9-9990XE wins all six tests.