Intel Core i7-4940MX vs Intel Xeon E3-1231 v3 Comparison

Head-to-Head Benchmarks

The recorded data presents a clear picture: the Intel Xeon E3-1231 v3 wins 7 out of 8 head-to-head benchmark comparisons, with the Intel Core i7-4940MX taking only a single victory. The Xeon's dominance is consistent across the Cinebench suite, with a nearly uniform margin of roughly 3.5% in every rendering test. In Cinebench R15 multi-core, the Xeon scores 601 against the i7's 580, a 3.5% advantage. Single-core R15 shows the same pattern: 84 versus 81, a 3.6% lead. The Cinebench R20 results mirror this exactly, with the Xeon at 2506 versus 2418 in multi-core (3.5% ahead) and 353 versus 341 in single-core (3.4% ahead). Cinebench R23 continues the trend: the Xeon posts 5967 versus 5759 in multi-core (3.5% ahead) and 842 versus 813 in single-core (3.4% ahead).

The Geekbench results introduce a different dynamic. In Geekbench multi-core, the Xeon again leads, scoring 3939 versus 3869, a smaller 1.8% margin. However, in Geekbench single-core, the i7-4940MX turns the tables decisively. It scores 1227 against the Xeon's 1109, a substantial 10.6% advantage. This is the only test where the mobile Extreme processor wins, but the margin is large enough to warrant investigation into what architectural or frequency characteristics might explain such a disparity.

The average benchmark scores in the database reinforce the overall ranking. The Xeon E3-1231 v3 holds an average score of 1925, while the i7-4940MX averages 1886. Both processors sit at the 43rd percentile among all CPUs in the database, placing them in the same broad performance tier despite the Xeon's consistent edge in the head-to-head matrix. The Xeon's nearest rivals include the Intel Core i3-10305T (1922, a 0.2% gap) and the Intel Core i7-1180G7 (1930, a 0.2% gap in the other direction), while the i7-4940MX sits within 0.1% to 0.3% of the Intel Xeon D-1531, Xeon E3-1270L v4, Xeon E3-1558L v5, and Intel Processor U300.

Architecture Differences

Both processors share the same fundamental Haswell architecture, but they diverge in several meaningful ways. The i7-4940MX carries the codename "Haswell" and belongs to the Core i7 Extreme generation, while the Xeon E3-1231 v3 uses the "Haswell-WS" codename and belongs to the Xeon E3 generation. Both are built on Intel's 22 nm process node and use the same 1,400 million transistors. The die sizes differ slightly: the i7-4940MX measures 177 mm², while the Xeon is smaller at 160 mm². This 17 mm² difference may reflect the i7's integrated graphics block, since the Xeon has no integrated GPU at all.

The cache hierarchies are identical in structure: 64 KB of L1 per core, 256 KB of L2 per core, and 8 MB of shared L3. Both processors have 4 cores and 8 threads, matching thread counts. Memory support is also the same, with DDR3 on a dual-channel bus delivering 25.6 GB/s of bandwidth. PCIe connectivity is identical as well: Gen 3 with 16 lanes from the CPU only.

The critical architectural differences are in clock speeds, socket, power, and feature support. The i7-4940MX has a base clock of 3.10 GHz and a boost clock of 4.00 GHz, while the Xeon E3-1231 v3 runs at a higher 3.40 GHz base but a lower 3.80 GHz boost. This explains the Xeon's consistent lead in multi-core workloads: its higher base clock helps sustain all-core throughput, while the i7's higher boost clock gives it a single-core edge when only one thread is active. The i7's boost advantage of 0.20 GHz appears to matter more in Geekbench single-core, where it wins by 10.6%, than in Cinebench single-core, where it still loses by 3.4% to 3.6%.

Socket and platform differences are substantial. The i7-4940MX uses Intel Socket G3 and targets the mobile market, while the Xeon uses Intel Socket 1150 for server and workstation platforms. The i7's TDP is 57 watts, significantly lower than the Xeon's 80 watts, which is notable given that the i7 is a mobile part. ECC memory support is exclusive to the Xeon; the i7 does not support ECC. The i7-4940MX includes Intel HD 4600 integrated graphics, whereas the Xeon has none. The i7 also has an unlocked multiplier, while the Xeon is locked.

Where Each One Wins

The data suggests a clear split by workload type. The Xeon E3-1231 v3 wins in every Cinebench test, both multi-core and single-core, by a margin of 3.4% to 3.6%. This consistency indicates that the Xeon's higher base clock of 3.40 GHz provides a reliable advantage in sustained rendering workloads, regardless of thread count. Cinebench's rendering engine appears to benefit more from the Xeon's baseline frequency than from the i7's higher boost ceiling. The Xeon also wins in Geekbench multi-core, though by a smaller 1.8% margin, suggesting that the multi-threaded portion of that workload is less sensitive to clock frequency differences.

The i7-4940MX's single win in Geekbench single-core is its most compelling case. The 10.6% advantage over the Xeon is far larger than any other delta in the head-to-head results, and it points to a scenario where the i7's 4.00 GHz boost clock delivers a decisive edge. This result implies that for lightly threaded applications that respond strongly to peak frequency, the i7-4940MX is the better choice, even though it trails in every other recorded test. The fact that the i7 loses single-core Cinebench despite this boost advantage suggests that Cinebench's single-core test stresses other aspects of the pipeline that favor the Xeon's architecture or its specific Haswell-WS tuning.

For users running multi-threaded rendering, video encoding, or any workload that scales across all 8 threads, the Xeon's higher base clock and consistent 3.5% Cinebench lead make it the safer pick. For users with single-threaded applications that are frequency-sensitive, particularly those resembling Geekbench's single-core test, the i7-4940MX offers a significant peak-performance advantage. The Xeon's ECC support also makes it the only choice for memory-integrity-sensitive environments, while the i7's integrated graphics and unlocked multiplier give it flexibility for mobile and overclocking scenarios.

FAQ

Q: Which processor has the higher boost clock?

A: The Intel Core i7-4940MX has a boost clock of 4.00 GHz, which is 0.20 GHz higher than the Intel Xeon E3-1231 v3's 3.80 GHz boost.

Q: Do both processors support ECC memory?

A: No. The Intel Xeon E3-1231 v3 supports ECC memory, while the Intel Core i7-4940MX does not.

Q: What is the performance gap in Cinebench R23 multi-core?

A: The Intel Xeon E3-1231 v3 scores 5967 in Cinebench R23 multi-core, which is 3.5% ahead of the Intel Core i7-4940MX's 5759.

Q: In which benchmark does the Intel Core i7-4940MX win?

A: The i7-4940MX wins only in Geekbench single-core, scoring 1227 against the Xeon's 1109, a 10.6% advantage.

Q: Which processor has a lower TDP?

A: The Intel Core i7-4940MX has a TDP of 57 watts, while the Intel Xeon E3-1231 v3 has a TDP of 80 watts.

Q: Do both processors have the same number of cores and threads?

A: Yes, both have 4 cores and 8 threads.

Specification Differences

The two processors differ in several specification fields. The base clocks are 3.10 GHz for the i7-4940MX and 3.40 GHz for the Xeon, a 0.30 GHz difference. The boost clocks are 4.00 GHz for the i7 and 3.80 GHz for the Xeon. TDP ratings are 57 watts for the i7 and 80 watts for the Xeon. The i7 uses Intel Socket G3, while the Xeon uses Intel Socket 1150. The codenames are Haswell for the i7 and Haswell-WS for the Xeon, with the i7 in the Core i7 Extreme generation and the Xeon in the Xeon E3 generation. Die sizes are 177 mm² for the i7 and 160 mm² for the Xeon. The i7 has integrated Intel HD 4600 graphics, while the Xeon has no integrated graphics. ECC memory support is true for the Xeon and false for the i7. The i7 has an unlocked multiplier, while the Xeon does not. The market segments are Mobile for the i7 and Server/Workstation for the Xeon. Release dates are January 2014 for the i7 and May 2014 for the Xeon. The i7's launch MSRP is $1096, while the Xeon's is $250.

The Verdict

The benchmark data supports a straightforward conclusion for most workloads: the Intel Xeon E3-1231 v3 is the more capable processor. It wins 7 of 8 head-to-head tests, with margins of 3.4% to 3.6% in Cinebench and 1.8% in Geekbench multi-core. Its higher base clock of 3.40 GHz gives it a reliable advantage in sustained workloads, and its ECC memory support and server/workstation market segment make it the appropriate choice for stability-focused systems.

The Intel Core i7-4940MX, however, has a distinct strength that should not be overlooked. Its 10.6% victory in Geekbench single-core is the largest margin in the entire comparison, and its 4.00 GHz boost clock provides a peak-frequency advantage that the Xeon cannot match. For users running lightly threaded, frequency-sensitive applications, particularly in a mobile form factor where the i7's 57 watt TDP and integrated graphics are assets, the i7-4940MX remains a compelling option.

The choice ultimately depends on the use case. The database shows that the Xeon is the default recommendation for multi-threaded rendering and server workloads, while the i7-4940MX is the pick for single-threaded peak performance and mobile flexibility. Both processors sit at the 43rd percentile overall, and their average scores (1925 for the Xeon, 1886 for the i7) are close enough that the deciding factors should be platform requirements, ECC needs, and the specific benchmark profile of the target applications.