Intel Core i7-3540M vs Intel Xeon X3460 Comparison

The Intel Core i7-3540M and Intel Xeon X3460 present one of the closest matchups in the database, with the mobile chip edging out the server part in every head-to-head benchmark despite a fundamental difference in core counts. The i7-3540M holds a razor-thin average benchmark score advantage of 867 over the Xeon’s 866, a 0.1% delta that places them as direct rivals. The Xeon X3460 counters with double the cores and threads, yet the data shows the two processors are statistically inseparable in the tested workloads. This parity raises a central question: does the architecture generation gap between Ivy Bridge and Nehalem fully compensate for a 2-core versus 4-core disparity?

Where Each One Wins

The benchmark results are unambiguous: the Intel Core i7-3540M wins all five head-to-head tests, but the margins are so small that they fall within noise. In Cinebench R15 multicore, the i7-3540M scores 254 against the Xeon’s 253, a 0.4% difference. The Cinebench R20 multicore test shows 1060 versus 1057, a 0.3% edge. The R23 multicore result is 2525 versus 2518, again 0.3%. Single-core tests are essentially tied, with R20 at 149 for both and R23 at 356 versus 355. The i7-3540M’s victory is consistent but marginal, never exceeding 0.4%.

The Xeon X3460, despite losing every benchmark, still wins in a broader system context not captured by these CPU-only tests. It supports ECC memory, a feature entirely absent from the i7-3540M. Its memory bandwidth is rated at 21.3 GB/s, a specification the mobile chip does not list. The Xeon also comes from the Server/Workstation segment with a 95W TDP, while the i7-3540M is a 35W mobile part. For workloads requiring error-correcting memory or sustained server-class operation, the Xeon’s feature set—not its benchmark scores—defines its winning territory.

FAQ

Q: Which processor has more cores?

A: The Intel Xeon X3460 has 4 cores and 8 threads, while the Intel Core i7-3540M has 2 cores and 4 threads.

Q: Are the single-core benchmark scores different between the two?

A: No. In Cinebench R20 single-core, both score exactly 149. In R23 single-core, the i7-3540M scores 356 versus the Xeon’s 355, a 0.3% difference that is effectively a tie.

Q: Does the Xeon X3460 support ECC memory?

A: Yes, ECC memory is listed as supported on the Xeon X3460. The Core i7-3540M does not support ECC memory.

Q: How do the average benchmark scores compare?

A: The i7-3540M has an average benchmark score of 867, and the Xeon X3460 has an average of 866. The delta is 0.1%, placing them as near-perfect equals.

Q: What is the thermal design power difference?

A: The Core i7-3540M has a TDP of 35W, while the Xeon X3460 has a TDP of 95W.

Q: Which processor has a larger L3 cache?

A: The Xeon X3460 has 8 MB of shared L3 cache, double the 4 MB shared L3 cache found on the Core i7-3540M.

Head-to-Head Benchmarks

The head-to-head data shows a pattern of consistent, tiny wins for the Intel Core i7-3540M. In Cinebench R15 multicore, the i7-3540M scores 254 against the Xeon’s 253, a 0.4% advantage. This is the largest margin in the entire comparison. The Cinebench R20 multicore test yields 1060 for the mobile chip and 1057 for the server part, a 0.3% gap. The R23 multicore test repeats the 0.3% pattern with scores of 2525 and 2518.

Single-core results are even closer. Cinebench R20 single-core shows a perfect tie at 149 points for both processors. Cinebench R23 single-core gives the i7-3540M a 356 to 355 edge, another 0.3% difference. The Xeon X3460’s higher boost clock of 3.47 GHz—versus the i7-3540M’s 3.70 GHz—does not translate into a single-core victory. The data suggests that the Ivy Bridge architecture’s efficiency offsets the Xeon’s additional cores in multicore tests, while the i7-3540M’s higher boost clock secures marginal single-core wins.

The average benchmark scores reinforce this picture. The i7-3540M’s average is 867, and the Xeon X3460’s is 866. The nearest rivals list confirms the tight grouping: the Atom C5315 scores 871, the Athlon PRO 3045B scores 872, and the Core i5-3470T scores 863. Both processors sit at the 23rd percentile of all CPUs, indicating that neither offers standout performance relative to the broader market.

Specification Differences

The two processors differ in nearly every fundamental specification. The Core i7-3540M uses 2 cores and 4 threads, while the Xeon X3460 uses 4 cores and 8 threads. Base clocks are 3.00 GHz for the mobile chip and 2.80 GHz for the server part. Boost clocks are 3.70 GHz and 3.47 GHz, respectively. The TDP gap is substantial: 35W for the i7-3540M versus 95W for the Xeon X3460.

The sockets are incompatible. The i7-3540M uses Intel Socket G2 (988B), a mobile socket, while the Xeon X3460 uses Intel Socket 1156. The i7-3540M includes integrated graphics (Intel HD 4000), while the Xeon X3460 has no integrated graphics. The Xeon supports ECC memory; the i7-3540M does not. The Xeon’s memory bandwidth is listed at 21.3 GB/s, a figure absent for the i7-3540M. The Xeon also lists PCIe Gen 2 with 16 lanes (CPU only), while the i7-3540M has no PCIe specification provided.

Release dates differ by over three years. The Xeon X3460 was released on September 7, 2009, while the i7-3540M arrived on January 7, 2013. The Xeon is marked end-of-life, while the i7-3540M has no production status listed. The Xeon has a launch MSRP of $316, a figure the i7-3540M lacks entirely.

Architecture Differences

The architectural gap is stark. The Core i7-3540M is built on Intel’s Ivy Bridge architecture at a 22 nm process node, while the Xeon X3460 uses the older Nehalem architecture at 45 nm. The die sizes reflect this: the i7-3540M measures 118 mm², while the Xeon X3460 is 296 mm². The Xeon’s transistor count is listed at 774 million, while the i7-3540M’s is not provided.

Cache configurations differ significantly. Both share 64 KB L1 and 256 KB L2 per core, but the L3 cache doubles from 4 MB shared on the i7-3540M to 8 MB shared on the Xeon X3460. This larger cache likely helps the Xeon compensate for its older architecture in multicore tests, yet it still trails by 0.3% in R23 multicore.

The codenames tell the story: “Ivy Bridge” for the mobile chip and “Lynnfield” for the server part. The generations are listed as “Core i7 (Ivy Bridge)” and “Xeon (Lynnfield)”. The foundry is Intel for both, and both use dual-channel DDR3 memory. The Xeon’s 45 nm process and 296 mm² die, combined with 774 million transistors, represent a physically larger and more power-hungry design. The i7-3540M’s 22 nm process and 118 mm² die deliver comparable performance at a fraction of the power envelope.

The Verdict

The data points to a clear conclusion for different user profiles. For anyone building or upgrading a system on Socket 1156, the Xeon X3460 is the only viable choice between these two, as the i7-3540M requires a completely different mobile socket. The Xeon also brings ECC memory support, a 21.3 GB/s memory bandwidth rating, and 8 MB of L3 cache, making it suited for workstation or server environments where data integrity matters more than raw benchmark scores. Its 4 cores and 8 threads provide theoretical headroom for heavily threaded workloads, even if the measured Cinebench results show no advantage.

For a mobile or compact system where power efficiency is paramount, the i7-3540M wins decisively. Its 35W TDP is less than half the Xeon’s 95W, yet it matches or slightly exceeds the Xeon in every benchmark. The integrated HD 4000 graphics eliminate the need for a discrete GPU in basic systems. The 22 nm Ivy Bridge architecture delivers the same multicore performance with two fewer cores, proving that architectural advancement can offset raw core counts.

The benchmark data does not support picking the Xeon for performance reasons. It loses all five head-to-head tests, albeit by margins under 0.5%. The i7-3540M’s wins are consistent, and its higher boost clock of 3.70 GHz gives it a slight edge in single-threaded tasks. The Xeon’s only meaningful advantages are ECC support, larger cache, and a server-grade feature set. Ultimately, the choice hinges on platform compatibility and feature requirements, not benchmark scores. The 23rd percentile ranking for both indicates they are mid-range performers, but the i7-3540M achieves that status with far greater efficiency and a newer architecture.