Intel Xeon E5440

The Intel Xeon E5440 is a 4-core, 4-thread server processor from the Harpertown generation, built on Intel’s 45 nm process with 820 million transistors across two dies, each measuring 2x 107 mm². It launched in late 2007 with an 80 W TDP, a 2.83 GHz base clock, and no boost capability, targeting the server and workstation segment. Its benchmark profile places it in the 17th percentile of all CPUs, with an average score of 692, which puts it in direct competition with entry-level desktop and low-power mobile parts from a much later era.

Single-Thread vs Multi-Thread Behavior

The E5440’s single-thread performance is modest by current standards. In Cinebench R23, the chip scores 284 points in the single-core test, while its multi-core score reaches 2011 points. That multi-core result is roughly 7 times higher than the single-core figure, which is expected for a true 4-core/4-thread design without hyper-threading. The lack of simultaneous multithreading means each core handles exactly one thread, so scaling from one to four cores is nearly linear in workloads that can use all cores.

In Cinebench R20, the pattern holds: the single-core score is 119, and the multi-core score is 844, a ratio of about 7.1. The older Cinebench R15 multi-core result is 202 points. These numbers indicate that the E5440 behaves like a classic quad-core part: it will feel sluggish in lightly threaded tasks such as web browsing, office document editing, or older games that rely on one or two fast cores. However, for multi-threaded rendering, video encoding, or batch processing, the chip can still pull its weight relative to its low absolute score.

The practical implication is that this processor is not a good choice for interactive single-thread-heavy applications. The data shows a clear split: multi-threaded throughput is roughly seven times single-thread performance, which is typical for a quad-core without turbo. Real-world workloads that are heavily serialized—like many legacy productivity apps or single-threaded game engines—will leave performance on the table. Conversely, workloads that scale with core count, such as Cinebench’s render loop, will see the E5440 perform closer to its potential.

Power and Thermals

The E5440 carries an 80 W TDP, which places it in the mid-range for desktop CPUs of its era. For a server part, this is relatively modest, and it implies that a capable air cooler with a 120 mm fan or a decent tower cooler can handle it without issue. The 45 nm process node helps keep heat density manageable, but the dual-die design (2x 107 mm²) means heat is spread across two physical packages, which can complicate cooling on some motherboards.

Because the chip has no boost clock, its power draw is steady under load—there are no sudden frequency spikes that would spike thermals. This makes thermal behavior predictable. In a well-ventilated case with a standard CPU cooler, the E5440 should stay within safe operating temperatures during sustained multi-threaded workloads. The 80 W TDP class also means that older 775-pin coolers with appropriate mounting brackets for Socket 771 can often be reused, provided the motherboard supports the mounting holes.

For a system builder, the key takeaway is that no exotic cooling is required. A basic tower cooler or even a high-quality downdraft cooler will suffice. The absence of overclocking support (the multiplier is locked) means there is no headroom to push voltages or frequencies, so thermal headroom beyond stock is irrelevant. The E5440 is an end-of-life product, so longevity concerns are more about motherboard availability than cooling.

Platform and Compatibility

The E5440 uses the Intel Socket 771, which is a server-oriented socket that is not directly compatible with mainstream desktop Socket 775 motherboards without adapter modifications. The chip supports dual-channel DDR2 or DDR3 memory, but the exact memory type depends entirely on the motherboard—some 771 boards accept DDR2, others DDR3, and a few support both, though not simultaneously. ECC memory is supported, which is a plus for workstation reliability, but it requires a motherboard with ECC-capable memory controller and registered or unbuffered ECC modules.

PCIe support is Gen 2, which is a significant limitation for modern GPUs. While a PCIe 2.0 x16 slot can physically accommodate a current graphics card, the bandwidth is roughly half of PCIe 3.0 and a quarter of PCIe 4.0. For gaming, this may bottleneck higher-end GPUs, but for basic display output or older titles, it is workable. The platform does not support PCIe 4.0 or 5.0 devices natively, so any modern NVMe SSD will run at reduced speeds or require an adapter that may not be fully supported.

Upgrade path is essentially nonexistent. The E5440 is the top end of its socket generation, and the production status is end-of-life. There are no faster 771 chips that would be worth upgrading to, and the motherboard chipsets for 771 are old, lacking modern USB 3.x, SATA 6 Gb/s, or M.2 slots. Users would need add-in cards for those features. The memory bus is dual-channel, which caps memory bandwidth compared to modern quad-channel or dual-channel DDR4/DDR5 platforms, but for the E5440’s core count, that is not the primary bottleneck.

How It Compares

The nearest rival by average score is the Intel Celeron G4900, which scores 691 points, a delta of 0.1% from the E5440’s 692. This Celeron is a much newer dual-core desktop part with a higher single-thread clock, yet its average score is virtually identical. The E5440 matches it in aggregate, but the Celeron will feel faster in single-threaded tasks while the Xeon pulls ahead in multi-threaded rendering due to its two extra cores.

The Intel Atom x7211RE is another rival with a 691 average score, also a 0.1% delta. That Atom is a low-power embedded chip, so the E5440’s performance parity comes with a much higher power draw (80 W vs. single-digit watts). For always-on systems, the Atom wins on efficiency, but for raw compute, the Xeon has an edge in multi-threaded workloads.

The Intel Core m7-6Y75 scores 690, a 0.2% delta. This is a fanless mobile part from the Skylake generation, designed for ultra-thin laptops. Its average score is nearly identical to the E5440, but the m7-6Y75 has a vastly higher single-thread score and much lower power consumption. The E5440 only beats it in multi-threaded throughput, and even then only narrowly.

The AMD Phenom II X4 840T scores 690, a 0.3% delta. This is a contemporary quad-core from AMD, also 4 cores and 4 threads. The two chips trade blows: the Phenom has a higher clock speed in some workloads, but the E5440’s larger L2 cache (6 MB per die) helps in memory-sensitive tasks. The delta is negligible, meaning either chip would perform nearly identically in most applications.

Benchmark Performance

The data shows that the E5440’s average benchmark score of 692 places it in the 17th percentile of all CPUs, meaning 83% of processors tested score higher. Its best result is in Cinebench R23 multi-core at 2011 points, which is about 7.1 times its single-core score of 284. In Cinebench R20, the multi-core score is 844, and the single-core score is 119, a ratio of 7.1 as well. The Cinebench R15 multi-core score is 202, consistent with the trend.

Compared to the Intel Celeron G4900, the E5440 has an average score that is 0.1% higher. That is a tie in practical terms. However, the E5440’s multi-core performance is substantially ahead: in Cinebench R23, the Xeon’s 2011 points would likely exceed the Celeron’s dual-core result by a wide margin, though the fact pack does not provide the Celeron’s individual scores. The delta of 0.1% reflects the aggregate average, not the multi-core advantage.

Against the Intel Atom x7211RE, the 0.1% delta is again a tie in average. But the Atom is a low-power part, so the E5440’s higher multi-core score in Cinebench R23 (2011 vs. whatever the Atom manages) comes at the cost of 80 W TDP. The practical difference is that the Xeon is a server chip meant for sustained loads, while the Atom is for embedded use.

The Core m7-6Y75, with a 0.2% delta, is nearly identical in average. Yet the m7-6Y75 has a much higher single-core score, likely double or more of the E5440’s 284 in R23, given its architecture. The Xeon only wins in multi-core, and even then the margin is small because the m7-6Y75 has two cores with hyper-threading.

The AMD Phenom II X4 840T’s 0.3% delta means the E5440 is 0.3% faster on average. Both are 4-core/4-thread parts from the same era, so the scores are unsurprisingly close. The Xeon’s advantage likely comes from its dual-die L2 cache design, which provides 6 MB per die, aiding cache-heavy workloads.

Who Should Consider It

The E5440 is a niche part for users who already own a Socket 771 motherboard, likely pulled from an old Dell or HP workstation. For those building a low-cost multi-threaded render box from scrap parts, the chip’s Cinebench R23 multi-core score of 2011 is respectable for its age, and the 80 W TDP is manageable. The 4 cores and 4 threads will handle video encoding, batch image processing, or compiling code, provided the workload is parallelized.

Gamers should avoid this processor unless they are playing very old titles that rely on a single core. The single-core score of 284 in R23 is far below modern entry-level chips, and the PCIe Gen 2 interface will bottleneck any GPU from the last decade. The lack of boost clock and locked multiplier means no overclocking to compensate.

Office users and general desktop tasks will find the E5440 adequate for basic word processing and spreadsheet work, but the single-thread performance will make modern web pages with heavy JavaScript feel slow. The 17th percentile ranking confirms that this is a low-end part by today’s standards.

The most sensible buyer is a hobbyist with free access to 771 hardware and a willingness to adapt coolers and memory. The chip’s ECC support and dual-channel memory make it suitable for a home server or NAS, where multi-threaded file serving and light virtualization are the primary tasks. For anyone buying new hardware, the E5440 makes no sense—its rivals, like the Celeron G4900, offer similar average performance with better platform features and lower power consumption.