Intel Xeon E5540

The Intel Xeon E5540 is a 2009-era server processor built on the 45 nm Nehalem architecture, codenamed Gainestown. It targets the Server/Workstation market segment and is now end-of-life, but its benchmark data still offers a useful reference point for legacy platform performance. This analysis examines its measured scores, power characteristics, platform fit, and competitive standing based exclusively on the provided benchmark database facts.

Benchmark Performance

The E5540’s aggregate benchmark profile places it at the 21st percentile of all CPUs in the database, with an average benchmark score of 820. This percentile position indicates that the processor outperforms roughly one-fifth of all recorded CPUs, a modest standing that reflects its age and dual-core-era design constraints despite having four physical cores and eight threads.

In multi-threaded workloads, the data shows a consistent pattern across Cinebench versions. The Cinebench R15 multicore score is 240, while the R20 multicore score reaches 1001, and the R23 multicore score climbs to 2384. These scores scale with the workload’s increasing demands, but the relative performance against modern rivals remains narrow. For instance, the nearest rival AMD PRO A10-8750B posts an average score of 821, which is just 0.1% higher than the Xeon’s 820. This near-identical average hides the fact that the Xeon’s multicore scores are its strongest suit, yet the delta is so small that it performs essentially on par with that AMD part.

Single-thread performance tells a slightly different story. The Cinebench R20 singlecore score is 141, and the R23 singlecore score is 336. These numbers are markedly lower than the multicore results, indicating that the E5540’s per-core efficiency is its weakness. Against the Intel Pentium G4500, which has an average score of 816, the Xeon leads by 0.5% — a negligible margin that suggests the two are interchangeable in lightly threaded tasks. Similarly, the Intel Celeron G6900TE (average score 813) trails the Xeon by 0.8%, and the Intel Core i7-5550U (average score 813) trails by 0.9%. These deltas are all sub-1%, meaning the E5540 does not decisively win or lose any head-to-head matchup in the database.

The gap between the R15 multicore score of 240 and the R23 multicore score of 2384 is substantial, but that is expected because Cinebench versions impose different rendering loads and scoring scales. What matters for interpretation is the relative positioning: the E5540 sits in a cluster of processors whose average scores range from 813 to 821, and its own 820 sits squarely in the middle. The data does not support any claim of superiority or inferiority beyond a fractional percentage point.

Power and Thermals

The E5540 carries a thermal design power (TDP) of 80 watts. This figure places it in a moderate power class for a server CPU of its generation, though it is not a low-power part by modern standards. For cooling, the 80 W TDP implies that a capable air cooler with a standard tower or downdraft design should suffice; liquid cooling or oversized heatsinks are unnecessary. The 45 nm process node, manufactured by Intel with 731 million transistors on a 263 mm² die, contributes to this thermal profile — older lithography typically requires more power per unit of performance than newer nodes.

The 80 W envelope also informs system-level design. In a dual-socket server motherboard, two E5540s would draw a combined 160 W under full load, which is manageable with adequate chassis airflow. The absence of integrated graphics means the CPU’s power budget is dedicated entirely to computation, not display output. For workloads that stress all eight threads, the 80 W TDP suggests that sustained multicore operation will generate noticeable heat, but the processor is unlikely to throttle with a properly sized cooler. The data does not specify temperature limits or cooling requirements beyond this TDP, so any thermal analysis must remain qualitative.

Platform and Compatibility

The E5540 uses the Intel Socket 1366 interface, a platform designed for the Nehalem generation. Its architecture is Nehalem, and the codename Gainestown further identifies it as a server-oriented variant. Memory support is DDR3 with a triple-channel memory bus, yielding a peak memory bandwidth of 25.6 GB/s. ECC memory is supported, which is a critical feature for server and workstation reliability. The platform also includes PCIe Gen 2 connectivity, though the data does not specify lane counts or configuration options.

The production status is end-of-life, and the release date is March 2009. This means the socket 1366 platform is obsolete for new builds, but the E5540 can still be sourced as a used or surplus component. The part number is SLBF6, which aids in identifying compatible motherboards. The multiplier is locked, so overclocking is not an option; performance must be taken as-is from the base clock of 2.53 GHz and boost clock of 2.80 GHz. The processor has 4 cores and 8 threads, with a cache hierarchy of 64 KB L1 per core, 256 KB L2 per core, and 8 MB shared L3 cache. This cache configuration is typical for Nehalem and helps mitigate the latency of DDR3 memory access.

Upgrade paths from the E5540 are limited to other socket 1366 Xeon parts, but the end-of-life status means no new processors are being produced for this socket. The triple-channel memory bus requires three DIMMs for full bandwidth; using fewer DIMMs would reduce theoretical bandwidth below the 25.6 GB/s figure. PCIe Gen 2 is sufficient for older expansion cards but lacks the bandwidth of Gen 3 or Gen 4 for modern GPUs or NVMe storage.

How It Compares

Against the AMD PRO A10-8750B, the E5540 is statistically tied. The AMD part’s average score of 821 is 0.1% higher, which is within measurement noise. The Xeon offers more threads (8 vs the AMD’s likely fewer), but the benchmark average does not reflect any meaningful advantage. In practice, the choice between these two would come down to platform features, not raw performance.

The Intel Pentium G4500 is a dual-core desktop part, yet its average score of 816 trails the Xeon by only 0.5%. This is a striking result: a modern dual-core with higher clocks nearly matches a four-core server part from 2009. The Xeon’s multicore scores may be higher, but the average benchmark score, which likely includes single-thread tests, pulls the Pentium close. The data shows no dominant winner.

The Intel Celeron G6900TE, with an average score of 813, is 0.8% behind the E5540. This Celeron is a low-end, low-power part, and its proximity to the Xeon underscores how far entry-level CPUs have come. The Xeon’s only edge is its 8 threads, which help in heavily parallel workloads, but the Celeron’s newer architecture compensates in single-thread tasks.

The Intel Core i7-5550U is a mobile ultra-low-voltage part, scoring 813 on average, 0.9% below the Xeon. This comparison highlights efficiency gains: a 15-watt-class mobile chip nearly matches an 80-watt server chip. The Xeon’s higher TDP does not translate into a meaningful performance lead in the benchmark data.

Single-Thread vs Multi-Thread Behavior

The E5540’s benchmark results reveal a stark split between single-thread and multi-thread performance. In Cinebench R20, the singlecore score is 141 versus a multicore score of 1001, giving a ratio of roughly 7.1x from four cores and eight threads. In Cinebench R23, the singlecore score is 336 versus a multicore score of 2384, a ratio of about 7.1x as well. These ratios indicate that the processor scales well across cores, achieving near-linear scaling for a 4-core/8-thread part, but the absolute single-thread scores are low.

For real workloads, this means the E5540 excels in tasks that use all threads, such as video rendering, batch processing, or database queries that are parallelized. A Cinebench R23 multicore score of 2384 is respectable for legacy server hardware, but a singlecore score of 336 is poor by modern standards. Applications that rely heavily on single-thread performance — such as older software, many games, or scripted workflows — will feel sluggish. The boost clock of 2.80 GHz is only 0.27 GHz above the base 2.53 GHz, so there is limited headroom for bursty single-thread loads.

The 8 MB shared L3 cache helps mitigate the single-thread deficit by reducing memory access latency, but it cannot compensate for the low clock speed and old architecture. The data shows a processor that is best suited for throughput-oriented server tasks where many threads are kept busy, rather than latency-sensitive interactive workloads.

FAQ

Q: What is the Intel Xeon E5540’s average benchmark score?

A: The average benchmark score is 820, placing it at the 21st percentile of all CPUs in the database.

Q: How does the E5540 compare to the AMD PRO A10-8750B?

A: The AMD PRO A10-8750B has an average score of 821, which is 0.1% higher than the E5540’s 820, indicating a statistical tie.

Q: What memory type and bus does the E5540 support?

A: It supports DDR3 memory with a triple-channel bus, offering a peak memory bandwidth of 25.6 GB/s, and it supports ECC memory.

Q: Is the E5540 overclockable?

A: No, the multiplier is locked, so the base clock of 2.53 GHz and boost clock of 2.80 GHz are the maximum attainable speeds.

Q: What is the TDP of the E5540 and what cooling does it imply?

A: The TDP is 80 watts, which implies that a capable air cooler is sufficient; no high-end liquid cooling is necessary.

Q: What are the single-core and multi-core Cinebench R23 scores?

A: The Cinebench R23 singlecore score is 336, and the multicore score is 2384, showing strong multi-thread scaling but weak single-thread performance.