Intel Core i5-5575R vs Intel Xeon E3-1225 v5 Comparison

# Head-to-Head Benchmarks

The benchmark data is unambiguous: the Intel Xeon E3-1225 v5 wins every single head-to-head test in this comparison. Across six Cinebench runs, the Xeon leads the Core i5-5575R by a remarkably consistent margin of roughly 14.6% to 15.3%. This uniformity across both multi-core and single-core workloads suggests a fundamental performance gap rather than workload-specific advantages.

In Cinebench R15 multi-core, the Xeon scores 510 against the i5's 435, a delta of -14.7% from the i5's perspective. The single-core R15 result tells a similar story: 72 for the Xeon versus 61 for the i5, a -15.3% gap. These are the two largest deltas in the entire benchmark suite, indicating that the Xeon's advantage is slightly more pronounced in lightly threaded workloads.

Moving to newer Cinebench versions, the pattern holds. In R20 multi-core, the Xeon posts 2127 versus 1816 for the i5 (-14.6%), while in R20 single-core, the Xeon scores 300 against 256 (-14.7%). The R23 results continue the trend: 5065 for the Xeon in multi-core versus 4324 for the i5 (-14.6%), and 715 versus 610 in single-core (-14.7%). The consistency of these deltas — all clustering between 14.6% and 15.3% — indicates that the Xeon's advantage scales evenly across both thread counts and workload types.

The average benchmark scores reinforce this picture. The i5-5575R averages 1478 across all benchmarks, while the Xeon E3-1225 v5 averages 1465. Interestingly, the i5's average is actually higher than the Xeon's, despite losing every head-to-head test. This is because the i5 also has Geekbench results included in its average — 3247 multi-core and 1072 single-core — while the Xeon's benchmark data in this comparison only includes Cinebench runs. When looking strictly at the shared Cinebench tests, the Xeon is ahead by the margins described above.

In terms of overall positioning, both processors sit at the 38th percentile among all CPUs tracked in the database. The i5-5575R's nearest rivals include the Core i5-7500T (average score 1483, just 0.4% higher), the Core i7-4710HQ (1473, 0.4% lower), and the Xeon E3-1225 v5 itself (1465, 0.9% lower). The Xeon's own nearest rivals include the Core i3-7350K (1462, 0.2% higher) and the AMD Ryzen 3 PRO 2200GE (1461, 0.3% higher). The Xeon's slightly lower average score relative to the i5 in this database is offset by its clean sweep in direct comparisons.

# The Verdict

The data presents a clear choice for different use cases. The Xeon E3-1225 v5 is the outright performance winner, taking all six head-to-head benchmark tests with a consistent 14-15% advantage. If raw computational throughput in Cinebench is the primary criterion, the Xeon is the superior part, period.

However, the i5-5575R has its own distinct advantages that the benchmark scores alone don't capture. It is a Broadwell-generation part with Iris Pro Graphics 6200 integrated graphics, while the Xeon comes with the more modest HD Graphics P530. For users who need capable integrated graphics without a discrete GPU, the i5's Iris Pro solution is the stronger choice. The i5 is also still marked as "Active" production status, whereas the Xeon is listed as "End-of-life" — meaning the i5 remains available for new systems while the Xeon is being phased out.

The Xeon targets a different market segment entirely: Server/Workstation rather than Desktop. It supports ECC memory, which the i5 does not, making it the appropriate pick for systems where data integrity and error correction are non-negotiable. The Xeon also supports both DDR3 and DDR4 memory, while the i5 is limited to DDR3, offering more flexibility in memory selection.

For a desktop user prioritizing integrated graphics performance, the i5-5575R makes sense. For a workstation or server builder needing ECC support, higher clock speeds, and better raw performance, the Xeon E3-1225 v5 is the data-backed choice. The Xeon's higher TDP — 80 watts versus 65 watts — is a minor trade-off for the performance gain. Given that the Xeon wins every benchmark, supports ECC and DDR4, and launched at a lower MSRP ($224 versus $265), it is the stronger overall processor when integrated graphics are not the deciding factor.

# Architecture Differences

The two processors come from different Intel microarchitectures. The i5-5575R is built on Broadwell, while the Xeon E3-1225 v5 uses Skylake. Both are fabricated on Intel's 14 nm process node, but they differ substantially in die size and transistor count. The Broadwell i5 has a die size of 182 mm², while the Skylake Xeon is considerably smaller at 122 mm². The Xeon's transistor count is listed at 1,750 million, while the i5's transistor count is not specified in the data.

The cache configurations differ markedly. Both processors have 64 KB of L1 cache per core and 256 KB of L2 cache per core, but the L3 cache is where they diverge: the i5 has 4 MB shared, while the Xeon has 8 MB shared. This doubling of L3 cache likely contributes to the Xeon's performance advantage, particularly in workloads with moderate data reuse.

Integrated graphics also differ by architecture generation. The i5-5575R features Iris Pro Graphics 6200, which is Broadwell's premium integrated graphics solution. The Xeon E3-1225 v5 comes with HD Graphics P530, Skylake's workstation-oriented graphics. While both are integrated solutions, the Iris Pro branding on the i5 suggests a higher-tier graphics capability.

The socket interfaces are entirely different. The i5 uses Intel BGA 1364, a ball-grid-array package that is soldered to the motherboard and not user-replaceable. The Xeon uses Intel Socket 1151, a standard LGA socket that allows for CPU replacement or upgrades. This is a significant practical difference for system builders and maintainers.

Memory support reflects the architectural generational shift. The Broadwell i5 supports only DDR3 memory, while the Skylake Xeon supports both DDR3 and DDR4. This gives the Xeon platform more modern memory options and a higher theoretical memory bandwidth: 34.1 GB/s versus 29.9 GB/s for the i5. Both use dual-channel memory buses.

# Specification Differences

The core and thread counts are identical — both have 4 cores and 4 threads. However, clock speeds favor the Xeon. The i5-5575R has a base clock of 2.80 GHz and a boost clock of 3.30 GHz. The Xeon E3-1225 v5 runs at 3.30 GHz base and 3.70 GHz boost, representing a 0.50 GHz advantage at base and 0.40 GHz at boost.

Thermal design power differs: the i5 is rated at 65 watts, while the Xeon consumes 80 watts. This 15-watt gap reflects the Xeon's higher clock speeds and larger L3 cache. The i5's lower TDP makes it more suitable for compact or passively cooled systems, while the Xeon requires more robust cooling.

ECC memory support is exclusive to the Xeon. The i5-5575R does not support ECC, while the Xeon E3-1225 v5 explicitly does. This is a defining feature for workstation and server applications where memory errors are unacceptable.

The launch MSRP differs: the i5-5575R launched at $265, while the Xeon E3-1225 v5 launched at $224. Production status also differs, with the i5 listed as "Active" and the Xeon as "End-of-life." Release dates are close: the i5 launched on 2015-05-14, and the Xeon followed on 2015-10-18.

Both processors use PCIe Gen 3 with 16 lanes (CPU only), and both have locked multipliers — neither supports overclocking. The market segments differ: the i5 is classified as Desktop, while the Xeon is classified as Server/Workstation.

# FAQ

Q: Which processor performs better in multi-core workloads?

A: The Intel Xeon E3-1225 v5 wins every multi-core test in the comparison. In Cinebench R23 multi-core, the Xeon scores 5065 versus 4324 for the i5-5575R, a -14.6% delta. The R15 and R20 multi-core results show the same pattern, with the Xeon ahead by 14.7% and 14.6% respectively.

Q: Does the i5-5575R win any benchmark in this comparison?

A: No. The Xeon E3-1225 v5 wins all six head-to-head benchmark tests. The i5 does have Geekbench scores (3247 multi-core, 1072 single-core) that are not directly compared against the Xeon, but in every shared Cinebench test, the Xeon is faster.

Q: Which processor supports ECC memory?

A: Only the Intel Xeon E3-1225 v5 supports ECC memory. The i5-5575R does not have ECC support. This makes the Xeon the appropriate choice for systems requiring error-correcting memory, such as servers or workstations handling critical data.

Q: What are the clock speed differences between the two processors?

A: The Xeon E3-1225 v5 has a base clock of 3.30 GHz and a boost clock of 3.70 GHz. The i5-5575R runs at 2.80 GHz base and 3.30 GHz boost. The Xeon is 0.50 GHz higher at base and 0.40 GHz higher at boost.

Q: Do these processors use the same motherboard socket?

A: No. The i5-5575R uses Intel BGA 1364, a soldered ball-grid-array package, while the Xeon E3-1225 v5 uses Intel Socket 1151, a standard LGA socket. The BGA socket means the i5 is not user-replaceable, while the Xeon can be swapped out.

Q: Which processor has more L3 cache?

A: The Xeon E3-1225 v5 has 8 MB of shared L3 cache, double the 4 MB found on the i5-5575R. Both processors have identical L1 (64 KB per core) and L2 (256 KB per core) cache configurations.