Intel Core i9-11900T vs Intel Xeon E-2356G Comparison

The Intel Core i9-11900T and the Intel Xeon E-2356G are two Rocket Lake-based processors that land in the same neighborhood of the performance database, yet they were built for different buyers. The i9-11900T is an end-of-life desktop part with a 35 W TDP, 8 cores and 16 threads, while the Xeon E-2356G is an active server and workstation chip with 6 cores, 12 threads, an 80 W TDP and ECC memory support. Despite the different positioning, the recorded data shows them trading blows in ways that are not obvious from the spec sheet: the Xeon wins 6 of 8 head-to-head benchmarks, but the i9 wins the two Geekbench tests by margins large enough to matter.

Where Each One Wins

The head-to-head record splits cleanly along benchmark families. The Xeon E-2356G takes every Cinebench test in the database: R15 multi-core (1575 vs 1572), R15 single-core (222 vs 221), R20 multi-core (6565 vs 6550), R20 single-core (926 vs 924), R23 multi-core (15632 vs 15596) and R23 single-core (2206 vs 2201). Every one of those margins sits within a fraction of a percent, so the Cinebench results effectively describe the two chips as equals in rendering workloads.

Geekbench tells a different story. The i9-11900T wins Geekbench multi-core 8257 to 7213, a 14.5 percent advantage, and Geekbench single-core 2157 to 2044, a 5.5 percent advantage. That is the largest gap anywhere in this comparison, and it runs in the opposite direction from the Cinebench sweep. The practical read: for rendering-style sustained multi-threaded loads as measured by Cinebench, either chip delivers nearly identical results. For the workload mix Geekbench captures, including its single-core component, the i9-11900T's extra two cores and four threads translate into a clear measurable lead.

Beyond raw benchmark wins, the data points each chip at a use case. The Xeon's ECC memory support and active production status align it with entry-level server and workstation duties where memory integrity matters. The i9-11900T's 35 W TDP makes it the low-power option of the pair, relevant for thermally constrained desktop builds, though its end-of-life status is a consideration for anyone planning a long-lived deployment.

Architecture Differences

Both chips share deep architectural DNA. Both are Intel Rocket Lake designs on a 14 nm process from Intel's own foundry, both use a 276 mm² die, both fit Socket 1200, and both were released in 2021, the i9 in March and the Xeon in September. The Xeon carries the Rocket Lake-E codename, a variant designation for the workstation line, but the underlying silicon family is the same.

The core counts diverge. The i9-11900T has 8 cores and 16 threads against the Xeon's 6 cores and 12 threads, and correspondingly more L3 cache: 16 MB shared versus 12 MB shared. Per-core cache is identical, with 80 KB of L1 and 512 KB of L2 per core on both parts. Clock behavior favors the Xeon at both ends: its base clock of 3.20 GHz sits far above the i9's 1500 MHz base, and its 5.00 GHz boost edges past the i9's 4.90 GHz. The TDP contrast is the sharpest spec difference in the table, 35 W for the i9 versus 80 W for the Xeon, which explains why the i9 must run a much lower base clock to stay inside its power envelope.

Memory and platform features are largely shared. Both support DDR4 on a dual-channel bus with 51.2 GB/s of bandwidth, and both provide PCIe Gen 4 with 20 CPU lanes. The Xeon adds ECC memory support, the single platform feature that separates them. Integrated graphics differ only in branding: UHD Graphics 750 on the i9 and UHD Graphics P750 on the Xeon. Neither chip has an unlocked multiplier.

Head-to-Head Benchmarks

Walking through the recorded results test by test shows how tight this matchup is. In Cinebench R15, the Xeon wins multi-core 1575 to 1572 and single-core 222 to 221, deltas of 0.2 and 0.5 percent respectively. Cinebench R20 repeats the pattern: 6565 to 6550 in multi-core and 926 to 924 in single-core, both 0.2 percent margins. Cinebench R23 lands at 15632 to 15596 multi-core and 2206 to 2201 single-core, again 0.2 percent gaps. Across all six Cinebench tests, the two chips are statistically indistinguishable, a notable outcome given that the i9 has two fewer threads of competition nowhere in sight and a quarter of the Xeon's TDP to work with.

Geekbench breaks the tie emphatically. In multi-core the i9 scores 8257 against the Xeon's 7213, a 14.5 percent win for the 8-core part. In single-core the i9 leads 2157 to 2044, 5.5 percent ahead, despite the Xeon's nominally higher 5.00 GHz boost clock. The single-core result suggests the i9 sustains higher practical clocks in bursty workloads within its power budget, while the multi-core result shows its extra threads being fully exploited.

Contextualizing against each chip's rival set: the i9-11900T's average benchmark score of 4685 places it within 0.5 percent of the Intel Core i9-10900F (4664 avg) and 0.5 percent behind the Core i9-10900E (4708), within 0.7 percent of the Core i9-9900KF (4652), and 1 percent behind the Core i7-6950X (4734). The Xeon E-2356G's average of 4548 is effectively tied with the Core i7-10700KF (4547), within 0.1 percent of the Core i5-1340P (4545), 0.4 percent ahead of the AMD Ryzen Embedded V2748 (4532), and 0.6 percent behind the Xeon W-2145 (4576). Both chips sit at the 58th percentile versus all CPUs in the database, meaning the overall performance tier is the same even as the per-test profiles differ.

FAQ

Q: Which chip is faster overall?

A: The database shows a split verdict. The Xeon E-2356G wins all six Cinebench tests, but each by only about 0.2 percent, which is effectively a tie. The i9-11900T wins both Geekbench tests, 14.5 percent ahead in multi-core and 5.5 percent ahead in single-core. Average benchmark scores are 4685 for the i9 versus 4548 for the Xeon, and the Xeon holds a 6-to-2 win count across the eight recorded tests.

Q: Does the higher core count of the i9-11900T translate into more multi-core performance?

A: Only in Geekbench, where its 16 threads help it to 8257 versus 7213. In Cinebench, the 12-thread Xeon matches it within a fraction of a percent, aided by its much higher 3.20 GHz base clock and 80 W power budget.

Q: Which processor supports ECC memory?

A: Only the Xeon E-2356G. The i9-11900T does not support ECC, which is a key differentiator for workstation and server use.

Q: Are these chips on the same socket and platform?

A: Yes. Both use Intel Socket 1200, both support DDR4 dual-channel memory at 51.2 GB/s, and both offer PCIe Gen 4 with 20 CPU lanes, so the platform requirements overlap heavily.

Q: Which one draws less power?

A: The i9-11900T, with a 35 W TDP versus the Xeon's 80 W. The tradeoff is visible in the base clocks: 1500 MHz for the i9 versus 3.20 GHz for the Xeon.

Q: Are both still in production?

A: No. The i9-11900T is listed as end-of-life, while the Xeon E-2356G remains an active product.

The Verdict

The data supports a clear division. Buyers who need ECC memory, a currently active product, and higher sustained base clocks for workstation or entry-server duty should choose the Xeon E-2356G, and the recorded Cinebench results confirm it delivers full rendering performance at or slightly above the i9's level. Buyers who prioritize the workload profile Geekbench measures, where the i9-11900T leads by 14.5 percent multi-core and 5.5 percent single-core, or who need to fit a capable 8-core processor into a 35 W power envelope, should choose the i9-11900T, accepting its end-of-life status. Neither chip dominates: the Xeon wins more tests, but the i9 wins the two tests with meaningful margins, and both sit at the same 58th percentile in the database. For memory-integrity-sensitive deployments the Xeon is the only qualifying option; for power-constrained desktop builds the i9 is the only qualifying option.

Specification Differences

• Cores: i9-11900T: 8, Xeon E-2356G: 6
• Threads: i9-11900T: 16, Xeon E-2356G: 12
• Base clock: i9-11900T: 1500 MHz, Xeon E-2356G: 3.20 GHz
• Boost clock: i9-11900T: 4.90 GHz, Xeon E-2356G: 5.00 GHz
• TDP: i9-11900T: 35 W, Xeon E-2356G: 80 W
• L3 cache: i9-11900T: 16 MB shared, Xeon E-2356G: 12 MB shared
• ECC memory: i9-11900T: no, Xeon E-2356G: yes
• Integrated graphics: i9-11900T: UHD Graphics 750, Xeon E-2356G: UHD Graphics P750
• Market segment: i9-11900T: Desktop, Xeon E-2356G: Server/Workstation
• Production status: i9-11900T: End-of-life, Xeon E-2356G: Active
• Release date: i9-11900T: March 2021, Xeon E-2356G: September 2021
• Launch MSRP: i9-11900T: $439, Xeon E-2356G: $311
• Series: i9-11900T: Core 11th Gen, Xeon E-2356G: Xeon E-2300 series
• Codename: i9-11900T: Rocket Lake, Xeon E-2356G: Rocket Lake-E
• Part number: i9-11900T: SRKNQ, Xeon E-2356G: SRKN2
• Average benchmark score: i9-11900T: 4685, Xeon E-2356G: 4548