CPU Comparison

The Intel Core i3-6100 and the Intel Xeon X5550 sit at identical average benchmark scores of 888, placing both at the 24th percentile among all CPUs. This equilibrium, however, masks fundamentally different performance profiles. The Xeon X5550 wins every head-to-head benchmark in this comparison, yet the i3-6100 counters with a modern feature set and significantly lower power requirements. These two processors represent opposite ends of the design spectrum, separated by nearly six and a half years of architectural evolution.

Head-to-Head Benchmarks

The Xeon X5550 demonstrates a consistent advantage across all five shared benchmark tests, with the i3-6100 trailing by roughly 13.5 to 13.8 percent in every instance. In Cinebench R15 multicore, the Xeon scores 259 against the i3's 224, a delta of -13.5 percent. The pattern holds in Cinebench R20 multicore, where the Xeon posts 1083 versus 934, a -13.8 percent gap. The R23 multicore test shows the Xeon at 2580 and the i3 at 2226, representing a -13.7 percent difference.

Single-core results tell the same story, which is notable given the i3's much higher base clock. In Cinebench R20 single-core, the Xeon scores 152 against the i3's 131, a -13.8 percent deficit. The R23 single-core test shows 364 versus 314, a -13.7 percent gap. The Xeon wins all five head-to-head matchups, giving it a clean 5-0 sweep.

The absolute score differences are modest, roughly 35 points in R15, 149 in R20 multicore, and 354 in R23 multicore, but they are consistent across every test iteration. This uniformity suggests a systemic advantage rather than test-specific anomalies. The i3-6100's higher clock speed, 3.70 GHz versus 2.67 GHz base and 3.07 GHz boost on the Xeon, does not compensate for the Xeon's additional cores and threads in these heavily threaded workloads.

The i3-6100 does not win a single benchmark in this comparison. Its Geekbench scores of 1605 multicore and 785 single-core exist in the data, but no corresponding Xeon Geekbench results are available for direct comparison. Within the shared benchmark suite, the Xeon X5550 is unequivocally faster.

Architecture Differences

The architectural divide between these two processors is substantial. The i3-6100 uses the Skylake architecture on a 14 nm process node, while the Xeon X5550 relies on the Nehalem architecture, codenamed Gainestown, built on a 45 nm node. The transistor counts reflect this generational leap: the i3 packs 1,400 million transistors into a 150 mm² die, whereas the Xeon uses 731 million transistors across a 263 mm² die.

Core configuration diverges sharply. The i3-6100 offers 2 cores and 4 threads, while the Xeon X5550 provides 4 cores and 8 threads. The i3 compensates with a 3.70 GHz base clock against the Xeon's 2.67 GHz base and 3.07 GHz boost. Cache hierarchies differ as well: both share 64 KB of L1 and 256 KB of L2 per core, but the Xeon's L3 cache doubles the i3's, offering 8 MB shared versus 4 MB shared.

Memory support represents a major platform divergence. The i3-6100 uses DDR4 memory over a dual-channel bus with 34.1 GB/s bandwidth. The Xeon X5550 uses DDR3 over a triple-channel bus, with no bandwidth figure listed in the data. The i3 lacks ECC memory support, while the Xeon includes it, reflecting their respective market positions. PCIe capabilities also differ: the i3 supports PCIe Gen 3 with 16 CPU lanes, while the Xeon offers PCIe Gen 2 without a lane count specified.

Power consumption heavily favors the i3-6100, which draws 51W TDP versus the Xeon's 95W. Integrated graphics are present only on the i3, featuring Intel HD 530, while the Xeon has none, a typical differentiation between desktop and server parts. The production status also differs: the i3-6100 remains active, while the Xeon X5550 is end-of-life. Release dates place the i3 at August 2015 and the Xeon at March 2009.

Where Each One Wins

The Xeon X5550 wins every multicore and single-core benchmark in the shared suite, making it the clear performance leader in this direct comparison. Its 4-core, 8-thread configuration delivers consistent advantages across all Cinebench versions, from R15 through R23. The Xeon also brings ECC memory support and triple-channel DDR3, features aimed at server and workstation reliability, though the i3's DDR4 support offers newer memory technology.

The i3-6100's advantages lie outside the benchmark suite. Its 51W TDP versus 95W represents a substantial efficiency gain, potentially halving power draw under load. The integrated Intel HD 530 graphics eliminate the need for a discrete GPU in basic systems, which the Xeon cannot match. The i3's active production status means ongoing availability, while the Xeon's end-of-life designation limits new deployments. The 14 nm process versus 45 nm also indicates the i3 belongs to a more modern platform with DDR4 memory and PCIe Gen 3 support.

For workloads requiring maximum throughput in Cinebench-style rendering, the Xeon wins outright. For applications prioritizing power efficiency, integrated graphics, or modern platform features, the i3-6100 presents a compelling alternative despite its benchmark deficit. The Geekbench multicore score of 1605 for the i3, while not directly comparable without Xeon data, suggests the i3 can handle general-purpose tasks reasonably well.

FAQ

Q: Which CPU has a higher average benchmark score?

A: Both processors have identical average benchmark scores of 888. They also share the same 24th percentile ranking among all CPUs, placing them at performance parity on average.

Q: How much faster is the Xeon X5550 in multicore workloads?

A: The Xeon X5550 leads by 13.5 percent in Cinebench R15 multicore, 13.8 percent in R20 multicore, and 13.7 percent in R23 multicore. The score gaps are 35 points, 149 points, and 354 points respectively.

Q: Does the i3-6100 win any benchmark against the Xeon X5550?

A: No. The Xeon X5550 wins all five head-to-head benchmarks: Cinebench R15 multicore, R20 multicore, R20 single-core, R23 multicore, and R23 single-core.

Q: What are the core and thread counts for each processor?

A: The i3-6100 has 2 cores and 4 threads. The Xeon X5550 has 4 cores and 8 threads. The Xeon also has twice the L3 cache, 8 MB versus 4 MB.

Q: Which CPU supports ECC memory?

A: The Xeon X5550 supports ECC memory, while the i3-6100 does not. The Xeon also uses triple-channel DDR3 memory, whereas the i3 uses dual-channel DDR4.

Q: What is the TDP difference between the two?

A: The i3-6100 has a 51W TDP, while the Xeon X5550 has a 95W TDP. The i3 also includes integrated Intel HD 530 graphics, which the Xeon lacks.

The Verdict

The benchmark data is unambiguous: the Xeon X5550 outperforms the i3-6100 in every shared test, with consistent margins around 13.5 to 13.8 percent. For users whose priority is raw compute throughput in Cinebench-style workloads, the Xeon is the superior choice based strictly on performance. Its 4-core, 8-thread configuration and 8 MB of L3 cache deliver measurable advantages across all five benchmark iterations.

However, the i3-6100 offers countervailing strengths that the benchmarks do not capture. Its 51W TDP versus 95W suggests significantly lower power draw, and the integrated Intel HD 530 graphics provide display output capability without additional hardware. The active production status and modern Skylake architecture on 14 nm technology position it as a current platform choice, whereas the Xeon is end-of-life with a 2009 release date. DDR4 memory support and PCIe Gen 3 connectivity also favor the i3 for new system builds.

The Xeon's ECC memory support and triple-channel DDR3 make it attractive for reliability-focused server or workstation applications, provided the platform limitations are acceptable. The i3's lack of ECC support and dual-channel memory constrain it in such roles. Yet for desktop use where integrated graphics and lower power matter, the i3-6100 holds clear advantages.

The data shows a performance-versus-features tradeoff. Users seeking maximum benchmark scores should select the Xeon X5550, which wins all five head-to-head tests. Users prioritizing power efficiency, integrated graphics, or modern platform features should consider the i3-6100, accepting a roughly 13.7 percent performance deficit in exchange for those capabilities. The identical average scores of 888 and equal 24th percentile rankings indicate the overall balance, but the distribution of strengths differs meaningfully between these two processors.