CPU Comparison

The Intel Xeon E-2356G and Intel Core i7-9800X represent two distinct approaches to high-core-count computing, separated by three years of architectural evolution. The Xeon, a Rocket Lake-E server part, leverages a newer 14nm process iteration with higher clocks, while the i7-9800X, a Skylake-X desktop flagship, counters with two additional physical cores and a wider memory bus. Benchmark data reveals a surprisingly close contest in most workloads, with the decisive separation occurring in single-threaded performance.

Head-to-Head Benchmarks

The head-to-head results show a dominant pattern: the Xeon E-2356G wins 7 of 8 benchmarks, but the Core i7-9800X takes the one test that matters most for certain workstation tasks. In Cinebench R15 multicore, the Xeon scores 1575 against the i7’s 1553, a narrow 1.4% margin. That same 1.4% delta repeats across Cinebench R20 multicore (6565 vs 6474), Cinebench R23 multicore (15632 vs 15416), and both single-core variants of all three Cinebench versions. The consistency is remarkable, the Xeon leads by exactly 1.4% in every Cinebench test, whether single or multi-threaded.

Single-core performance is where the Xeon builds its largest advantage. In Geekbench single-core, the Xeon scores 2044 against the i7’s 1398, a 46.2% lead. This is not a marginal difference; it is a generational gap. The Xeon’s 5.00 GHz boost clock versus the i7’s 4.50 GHz explains part of this, but the Rocket Lake architecture’s improved IPC is the dominant factor. The i7-9800X, with its lower 4.50 GHz boost and older Skylake core design, cannot compete in latency-sensitive or lightly-threaded workloads.

The one benchmark the i7-9800X wins is Geekbench multicore, scoring 7488 against the Xeon’s 7213, a 3.7% advantage. This result inverts the Cinebench trend, where the Xeon’s 6 cores and 12 threads somehow outperform the i7’s 8 cores and 16 threads. The discrepancy likely stems from Geekbench’s workload characteristics, which may favor the i7’s higher memory bandwidth (85.3 GB/s vs 51.2 GB/s) or its quad-channel memory bus. The i7’s 3.80 GHz base clock versus the Xeon’s 3.20 GHz also helps in sustained all-core loads that do not hit the boost ceiling.

Across all eight benchmarks, the Xeon’s average score is 4548, placing it in the 58th percentile of all CPUs. The i7-9800X averages 4455, also in the 58th percentile. Despite the Xeon’s benchmark win count, the overall average scores sit close, the Xeon leads by roughly 2.1%. The nearest rivals for the Xeon include the Intel Core i7-10700KF (avg 4547, 0% delta) and the Intel Xeon W-2145 (avg 4576, -0.6% delta). The i7-9800X’s nearest rivals are the AMD Ryzen 5 PRO 5650GE (avg 4470, -0.3% delta) and Intel Core i7-12700TE (avg 4513, -1.3% delta). These figures place both CPUs in a crowded mid-range performance tier, with neither achieving breakout status.

Where Each One Wins

The Xeon E-2356G is the clear choice for single-threaded and lightly-threaded applications. Its 46.2% lead in Geekbench single-core translates directly to faster response times in databases, web servers, and development tools that rely on per-core performance. The 1.4% Cinebench single-core advantage, while smaller, reinforces this pattern. For workloads that are not perfectly parallelized, the Xeon’s higher boost clock and newer architecture provide a tangible edge.

The i7-9800X wins in Geekbench multicore, suggesting it holds an advantage in certain parallel workloads that benefit from its 8 cores and 16 threads. The 3.7% lead here, combined with its quad-channel memory support and 85.3 GB/s bandwidth, makes it a reasonable fit for memory-intensive rendering or simulation tasks that scale well beyond 12 threads. Its unlocked multiplier also allows manual overclocking, though the data does not include overclocked results. The i7’s 165W TDP versus the Xeon’s 80W TDP indicates it draws more power to sustain its core count, which may matter in sustained all-core workloads.

For mixed workloads, the Xeon’s consistent 1.4% lead in all Cinebench tests, both single and multi-threaded, makes it the safer default. The i7-9800X only surpasses the Xeon in one specific test, and that advantage is smaller than the Xeon’s single-core dominance. The Xeon also offers ECC memory support, a feature absent on the i7, which is critical for data integrity in server environments. The i7’s end-of-life production status further favors the Xeon for new deployments, as the Xeon remains active.

FAQ

Q: Which CPU has the higher single-core performance?

A: The Intel Xeon E-2356G leads by 46.2% in Geekbench single-core (2044 vs 1398) and by 1.4% in all three Cinebench single-core tests, including Cinebench R23 single-core (2206 vs 2176).

Q: Does the Core i7-9800X win any benchmark?

A: Yes, it wins Geekbench multicore with a score of 7488 against the Xeon’s 7213, a 3.7% advantage. This is the only benchmark where the i7 outperforms the Xeon.

Q: What is the difference in average benchmark scores?

A: The Xeon E-2356G has an average score of 4548, while the Core i7-9800X averages 4455. Both CPUs sit in the 58th percentile of all CPUs.

Q: Which CPU supports ECC memory?

A: Only the Intel Xeon E-2356G supports ECC memory. The Core i7-9800X does not list ECC support in its specifications.

Q: How do the CPUs compare in core and thread counts?

A: The Core i7-9800X has 8 cores and 16 threads, while the Xeon E-2356G has 6 cores and 12 threads. Despite this, the Xeon leads in Cinebench R23 multicore (15632 vs 15416).

Q: What is the production status of each CPU?

A: The Xeon E-2356G is listed as Active, while the Core i7-9800X is End-of-life.

Specification Differences

The two CPUs differ across nearly every specification field. The Xeon E-2356G uses 6 cores and 12 threads, while the i7-9800X has 8 cores and 16 threads. Base clocks differ by 0.60 GHz, the i7 runs at 3.80 GHz, the Xeon at 3.20 GHz, but the Xeon boosts higher at 5.00 GHz versus the i7’s 4.50 GHz. Power draw is dramatically different: the Xeon has an 80W TDP, the i7 a 165W TDP. Sockets also differ, with the Xeon on Intel Socket 1200 and the i7 on Intel Socket 2066. Memory channels differ (Dual-channel vs Quad-channel), as does memory bandwidth (51.2 GB/s vs 85.3 GB/s). ECC support is present only on the Xeon. PCIe generations and lane counts differ: the Xeon offers Gen 4 with 20 lanes, the i7 offers Gen 3 with 44 lanes. The Xeon includes integrated graphics (UHD Graphics P750), while the i7 has none. The Xeon has a locked multiplier; the i7 is unlocked. Market segments differ (Server/Workstation vs Desktop). The Xeon’s launch MSRP is $311, while the i7’s is $589. Release dates differ by about three years, with the Xeon released in September 2021 and the i7 in October 2018.

Architecture Differences

Architecturally, these are products of different design eras. The Xeon E-2356G uses the Rocket Lake architecture on a 14nm process, with a die size of 276 mm². The i7-9800X uses the older Skylake architecture, also on 14nm, though its die size is not listed. Cache layouts differ significantly: the Xeon has 80 KB of L1 per core and 512 KB of L2 per core, while the i7 has 64 KB of L1 per core and 1 MB of L2 per core. Shared L3 cache is 12 MB on the Xeon versus 16.5 MB on the i7. The Xeon’s codename is Rocket Lake-E, while the i7’s is Skylake-X. Generation labels also differ: the Xeon is from the Xeon E (Rocket Lake-E) generation, while the i7 is from the Core i7 (X-Series 9th Gen). The Xeon’s smaller L2 per core but larger L1, combined with its higher boost clock, contributes to its single-core advantage. The i7’s larger L2 and L3 caches, plus its extra cores, help in the Geekbench multicore test. The Xeon’s PCIe Gen 4 support is a generational upgrade over the i7’s PCIe Gen 3, offering faster peripheral bandwidth, though the i7 provides more total lanes (44 vs 20). The Xeon’s integrated graphics is a functional addition absent on the i7, which relies entirely on a discrete GPU. The i7’s unlocked multiplier allows overclocking, a feature the Xeon lacks. The Xeon’s ECC memory support and server market positioning, combined with its active production status, make it the more future-proof option, while the i7’s higher core count and memory bandwidth address a different class of desktop workstation workloads.