Intel Xeon L5520

The Intel Xeon L5520 is a 4-core, 8-thread server processor built on Intel's Nehalem architecture (codename Gainestown) and fabricated on a 45 nm process with 731 million transistors on a 263 mm² die. It runs at a base clock of 2.27 GHz and a boost clock of 2.53 GHz, with a 60 W TDP. It uses the Intel Socket 1366 platform, supports triple-channel DDR3 memory with ECC, and provides PCIe Gen 2 connectivity. Released in March 2009 and now marked as end-of-life, this part targets the server and workstation segment. Its average benchmark score across the database is 665, placing it at the 16th percentile of all CPUs—meaning roughly 84% of processors score higher.

Benchmark Performance

The L5520's multicore results are modest by modern standards but consistent with its legacy positioning. In Cinebench R15 multicore, it scores 194 points; in Cinebench R20 multicore, it reaches 811 points; and in Cinebench R23 multicore, it manages 1932 points. Single-thread performance is considerably lower: 114 points in Cinebench R20 single-core and 272 points in Cinebench R23 single-core. These numbers reflect a 45 nm quad-core design with a 2.53 GHz boost ceiling—enough for lightly threaded legacy workloads but not competitive with even entry-level modern chips.

When compared to its nearest rivals, the L5520 sits in a tight cluster. Its average benchmark score of 665 exactly matches the Intel Core i3-3220 (deltaPct 0%). It is 0.1% ahead of the Intel Core i7-940XM (664 average score), 0.2% behind the AMD Athlon X4 730 (666 average score), and 0.3% ahead of the AMD Athlon II X4 640 (663 average score). These deltas are negligible in real-world terms; the L5520 effectively trades blows with early-2010s quad-core desktop parts. The percentile ranking of 16 confirms that the vast majority of CPUs outperform it, but within its own era, it holds its own against mainstream quad-cores.

Power and Thermals

With a TDP of 60 W, the L5520 is exceptionally efficient for a quad-core Nehalem part. This low thermal envelope means that a standard air cooler with a modest heatsink is sufficient; no high-end liquid cooling or oversized tower is required. The 45 nm process and the relatively low clock speeds contribute to this frugal power draw. In a server or workstation chassis, the 60 W TDP also simplifies cooling design, allowing for dense multi-socket configurations without excessive heat buildup. For an end-of-life platform, this low TDP is one of the few modern conveniences—it runs cool and quiet under typical loads, making it viable for repurposed builds where noise and heat are concerns.

How It Compares

Intel Core i3-3220: The L5520 matches the i3-3220 exactly in average benchmark score (665 vs. 665, deltaPct 0%). The i3-3220 is a dual-core with Hyper-Threading, while the L5520 has four physical cores and eight threads. In multithreaded workloads, the L5520's extra cores likely give it an edge, but the i3-3220's higher per-core IPC (Ivy Bridge architecture) closes the gap in single-threaded tasks. The net result is a statistical tie.

Intel Core i7-940XM: The L5520 is 0.1% faster than the i7-940XM (665 vs. 664). The i7-940XM is a mobile extreme edition part with similar Nehalem lineage, but it runs at higher clocks (up to 3.3 GHz boost) and has a much higher TDP. Despite that, the L5520 edges it out in the aggregate benchmark score, likely due to better sustained performance or thermal headroom. The difference is negligible.

AMD Athlon X4 730: The L5520 trails the Athlon X4 730 by 0.2% (665 vs. 666). The Athlon X4 730 is a desktop quad-core based on AMD's Piledriver architecture, which offers competitive multi-threaded performance but weaker single-thread efficiency. The L5520's 0.2% deficit is within measurement noise; in practice, the two are interchangeable in most workloads.

AMD Athlon II X4 640: The L5520 is 0.3% ahead of the Athlon II X4 640 (665 vs. 663). The Athlon II X4 640 is a 45 nm quad-core with no L3 cache, while the L5520 has 8 MB of shared L3. That cache advantage likely contributes to the L5520's slight lead, especially in memory-sensitive applications. Again, the gap is tiny.

Platform and Compatibility

The L5520 uses the Intel Socket 1366, a platform introduced with the Nehalem architecture. It supports triple-channel DDR3 memory, and ECC memory is enabled, which is a key requirement for server and workstation reliability. The memory bus is triple-channel, meaning three DIMMs per channel are used to maximize bandwidth. The processor also provides PCIe Gen 2 lanes, sufficient for the era's graphics cards and storage controllers. There is no integrated graphics on this CPU, so a discrete GPU is mandatory.

The platform is end-of-life, as indicated by the production status. This means new units are not available, and the socket is obsolete. However, for users with existing Socket 1366 motherboards, the L5520 remains a viable low-power drop-in upgrade. The 60 W TDP is notably lower than many other Socket 1366 parts, making it attractive for builds that prioritize energy efficiency over peak performance. The 45 nm process and 731 million transistor count are historical details, but they inform the chip's thermal characteristics and compatibility with older BIOS revisions.

FAQ

Q: Does the Intel Xeon L5520 support ECC memory?

A: Yes, ECC memory is supported. This is a standard feature for server and workstation processors.

Q: What socket does the L5520 use?

A: It uses the Intel Socket 1366, which is specific to the Nehalem architecture.

Q: What type of memory does it support?

A: It supports DDR3 memory in a triple-channel configuration. This means three matched memory modules are used to achieve full bandwidth.

Q: What is the TDP of the L5520?

A: The TDP is 60 W, which is quite low for a quad-core processor. A basic air cooler is sufficient for most applications.

Q: How does the L5520 compare to the Intel Core i3-3220?

A: The two have identical average benchmark scores (665), so they are effectively tied in overall performance. The L5520 has more cores (4 vs. 2) but lower per-core clocks.

Q: Is the L5520 still in production?

A: No, the production status is end-of-life. It was released in March 2009 and is no longer manufactured.

Who Should Consider It

The L5520 is best suited for legacy server or workstation environments where the Socket 1366 platform is already in place. Its 60 W TDP makes it an attractive choice for low-power file servers, home labs, or dedicated firewall appliances that require ECC memory but do not demand high computational throughput. The 4-core/8-thread configuration can handle light virtualization or multi-threaded background tasks, as evidenced by its Cinebench R23 multicore score of 1932—adequate for older software but far from modern performance levels.

For gaming, the L5520 is not a practical option. Its single-core scores (114 in Cinebench R20, 272 in Cinebench R23) are too low for modern game engines that rely heavily on single-thread performance. Even the best-case scenario with a strong discrete GPU would be bottlenecked by the CPU's limited IPC and clock speed.

For content creation, the L5520 might handle basic photo editing or audio processing, but its multicore scores (811 in Cinebench R20, 1932 in Cinebench R23) are far below what even entry-level modern CPUs achieve. It would struggle with 4K video editing or 3D rendering workloads.

The L5520's real value lies in its efficiency and platform features. If you already own a Socket 1366 motherboard and need a low-TDP Xeon with ECC support, this chip is a sensible, inexpensive choice. For anyone building a new system, the end-of-life status and lack of modern features (no integrated graphics, PCIe Gen 2 only) make it an impractical option. The benchmark data confirms it sits in the bottom 16% of all CPUs, so it should only be considered for specialized, low-power legacy applications.