Intel Xeon E3-1240L v3

The Intel Xeon E3-1240L v3 is a 4-core, 8-thread server processor built on the Haswell-WS architecture and launched on May 10, 2014 with a launch MSRP of $278. It operates at a 2.00 GHz base clock, boosts to 3.00 GHz, and carries an 8 MB shared L3 cache. Its defining trait is a 25W TDP, making it a notably low-power quad-core Xeon. The chip is now end-of-life, but its benchmark profile still offers a useful reference point for legacy Socket 1150 systems.

Platform and Compatibility

The E3-1240L v3 fits the Intel Socket 1150 platform. It is a 22nm part with 1,400 million transistors on a 160 mm² die. Memory support is DDR3 over a dual-channel bus with 25.6 GB/s of bandwidth, and ECC memory is supported — a key feature for server and workstation reliability. The CPU provides PCIe Gen 3 with 16 lanes available from the CPU only; there is no integrated graphics block, so a discrete GPU or a server board with its own display output is required.

Because the chip is end-of-life, the upgrade path is limited to used Socket 1150 boards. The multiplier is locked, so overclocking is not available. The platform is mature, and the combination of DDR3 and PCIe Gen 3 reflects its 2014-era design. For builders looking at this chip today, the practical takeaway is that you are committing to a legacy platform with no forward upgrade path — what you buy is what you get. The 16 PCIe Gen 3 lanes are sufficient for a single discrete GPU, though the platform's age limits expansion options.

Power and Thermals

The headline figure here is the 25W TDP. That places the E3-1240L v3 in a class far below typical desktop quad-cores, which usually draw several times that amount. The low TDP is a direct consequence of the 2.00 GHz base clock and the Haswell architecture's efficiency at 22nm. With only 1,400 million transistors and a 160 mm² die, the chip is physically small and generates relatively little heat.

Cooling requirements are correspondingly modest. A basic air cooler with a small heatsink is more than adequate; the data suggests that even a low-profile or passive cooling solution would be viable in a well-ventilated case. The lack of integrated graphics reduces the thermal load further, since there is no iGPU die to feed power to. The locked multiplier also means no overclocking headroom, so the 25W figure is effectively a hard ceiling for sustained loads. For a server or workstation that runs continuously, this translates into low heat output and reduced cooling noise compared to mainstream desktop parts. The 25W TDP also means that the chip can be cooled by the stock cooler that ships with many Socket 1150 boards, and fanless operation is plausible in a chassis with good airflow.

Benchmark Performance

Benchmark results place the E3-1240L v3 at the 38th percentile of all CPUs in the database, with an average benchmark score of 1389. That is a mid-pack position, reflecting a chip that was designed for efficiency rather than raw performance.

In Cinebench R15, the chip scores 484 in multi-core and 68 in single-core. Cinebench R20 shows 2017 multi-core and 284 single-core. Cinebench R23, the most demanding of the three, yields 4803 multi-core and 678 single-core. The single-core numbers are low by modern standards, which is expected for a 2.00 GHz base clock Haswell part. The multi-core scores benefit from the 8 threads, but the 25W power envelope limits how high the chip can sustain its boost clock under an all-core load.

Comparing to nearest rivals, the E3-1240L v3 is effectively tied with the Intel Core i3-8109U, which scores 1391 — a delta of -0.1%, meaning the Xeon is a hair behind. Against the AMD Opteron 6274, the Xeon is 0.1% ahead (1387 vs 1389). The AMD Ryzen 3 2300U scores 1394, putting the Xeon 0.3% behind. Finally, the AMD Opteron 6238 scores 1383, with the Xeon 0.5% ahead. In all four cases, the differences are within 0.5%, so the E3-1240L v3 can be considered performance-equivalent to these rivals in aggregate benchmark terms.

The practical interpretation: this is not a chip that will win any speed contests, but its 4-core/8-thread configuration delivers consistent, predictable throughput for lightly threaded server workloads. The 38th percentile ranking means the majority of CPUs in the database are faster, but for a 25W part, the performance-per-watt profile is the real story. The gap between the R15 and R23 multi-core scores reflects the increasing workload demands of successive Cinebench versions, but the chip's relative position remains consistent.

FAQ

Q: What socket does the Intel Xeon E3-1240L v3 use?

A: It uses the Intel Socket 1150.

Q: Does it support ECC memory?

A: Yes, ECC memory support is enabled, making it suitable for error-correcting server memory.

Q: Does the processor include integrated graphics?

A: No. The integrated graphics field is null, so a discrete GPU or server board with its own video output is required.

Q: Can the multiplier be unlocked for overclocking?

A: No, the multiplier is locked, so the chip cannot be overclocked.

Q: What memory type and channel configuration does it support?

A: It supports DDR3 in a dual-channel configuration, with 25.6 GB/s of memory bandwidth.

Q: Is this processor still in production?

A: No, its production status is end-of-life.

How It Compares

Intel Core i3-8109U: The i3-8109U averages 1391, which is 0.1% ahead of the Xeon's 1389. The margin is negligible, so the two can be considered performance peers in aggregate. The Xeon brings ECC memory support and a 25W TDP, which are its defining advantages.

AMD Opteron 6274: The Opteron 6274 averages 1387, placing it 0.1% behind the Xeon. Again, the difference is within run-to-run variance. The Xeon's 25W TDP and ECC support are the traits that matter for server deployments.

AMD Ryzen 3 2300U: The Ryzen 3 2300U averages 1394, 0.3% ahead of the Xeon. This is the closest rival in terms of score. The Xeon trails slightly but remains within the same performance band.

AMD Opteron 6238: The Opteron 6238 averages 1383, putting it 0.5% behind the Xeon. This is the largest delta among the four rivals, yet still under a full percentage point. The Xeon holds a narrow edge.

Who Should Consider It

The E3-1240L v3 is aimed squarely at the server and workstation market segment. Its 4 cores and 8 threads, combined with a 25W TDP, make it a strong fit for always-on systems where power draw and heat output are primary concerns. Homelab servers, network-attached storage boxes, and lightweight virtualization hosts that don't need high single-thread performance will find the chip adequate. The ECC memory support is a significant plus for any workload where data integrity matters.

For gaming, the chip is a poor fit. The single-core Cinebench R23 score of 678 is low, and there is no integrated graphics, so a discrete GPU is mandatory. The 38th percentile overall ranking reflects a part that is outclassed by modern desktop processors in every metric except power efficiency.

For content creation and office work, the picture is mixed. Multi-threaded creation tasks will use the 8 threads, but the R23 multi-core score of 4803 is modest by today's standards. Office productivity, web browsing, and light administrative tasks are well within its capabilities. The locked multiplier and end-of-life status mean there is no upgrade path, so buyers should plan for a fixed configuration. For users who already own a Socket 1150 board and a DDR3 kit, the E3-1240L v3 offers a low-power drop-in upgrade that preserves existing memory and storage investments.

In short, this is a specialist part: if you need a low-power, ECC-capable Xeon on a legacy Socket 1150 board, and you don't expect high performance, the E3-1240L v3 fits. For anything else, the benchmark data suggests looking at more modern alternatives.