Intel Core i7-3540M vs Intel Core i7-860 Comparison

Head-to-Head Benchmarks

The benchmark results between the Intel Core i7-860 and the Intel Core i7-3540M show a remarkably consistent pattern across all five shared Cinebench tests: the desktop Lynnfield chip wins every single contest, but by margins so narrow that the two processors are effectively trading blows. The largest victory for the i7-860 comes in Cinebench R23 multi-core, where it scores 2574 against the i7-3540M's 2525, a delta of 1.9 percent. In the remaining four tests, the i7-860 wins by exactly 2 percent each time. This includes Cinebench R15 multi-core (259 versus 254), Cinebench R20 multi-core (1081 versus 1060), Cinebench R20 single-core (152 versus 149), and Cinebench R23 single-core (363 versus 356).

A 2 percent edge is within the range of run-to-run variance for most benchmark suites, but the fact that it appears uniformly across every workload, both single-threaded and multi-threaded, suggests a genuine, if modest, performance advantage for the older desktop part. The i7-3540M does counter with additional Geekbench results that the i7-860 does not have recorded in the database, scoring 1160 in Geekbench multi-core and 565 in Geekbench single-core. Those numbers cannot be compared directly since the i7-860 lacks corresponding Geekbench entries, but they do establish the mobile chip as a capable performer in its own right.

The consistency of the Cinebench deltas is striking. In single-core tests, the i7-860 leads by 2 percent in both R20 and R23. In multi-core tests, the lead is again 2 percent in R15 and R20, with R23 showing a slightly smaller 1.9 percent gap. The i7-860's win count stands at 5, while the i7-3540M records 0 wins in the head-to-head comparison. However, the average benchmark scores tell a slightly different story: the i7-860 averages 886 across its recorded benchmarks, while the i7-3540M averages 867. That is a difference of roughly 2.2 percent, which aligns closely with the individual test deltas.

Looking at the broader competitive landscape, the i7-860 sits at the 24th percentile of all CPUs in the database, with nearest rivals including the AMD PRO A8-8650B (average score 887, delta of -0.1 percent), the Intel Pentium G4560T (887, -0.1 percent), the Intel Xeon X5550 (888, -0.2 percent), and the Intel Core i3-6100 (888, -0.3 percent). The i7-3540M rests at the 23rd percentile, with nearest rivals including the Intel Xeon X3460 (866, +0.1 percent), the Intel Core i5-3470T (863, +0.4 percent), the Intel Atom C5315 (871, -0.5 percent), and the AMD Athlon PRO 3045B (872, -0.6 percent). Both processors occupy nearly the same percentile band, confirming that the 2 percent Cinebench gap is representative of their overall standing.

Where Each One Wins

The use-case split between these two processors is defined more by their design targets than by the benchmark scores themselves. The i7-860 wins all five recorded Cinebench tests, making it the pick for any workload represented by those benchmarks. That includes both single-threaded rendering tasks, where its 363 R23 single-core score edges out the 356 of the i7-3540M, and multi-threaded rendering, where its four physical cores and eight threads provide a small but consistent advantage over the dual-core, four-thread mobile part.

The i7-3540M does not win a single head-to-head benchmark, but its role is different. It is a mobile processor with a 35 watt TDP, versus the 95 watt TDP of the i7-860. This makes it the clear choice for systems where power consumption and thermal output matter more than raw rendering performance. The i7-3540M also includes integrated graphics in the form of Intel HD 4000, while the i7-860 has no integrated graphics listed in the database. For a compact laptop or a small-form-factor system that relies on the CPU's built-in display output, the i7-3540M is functionally superior despite its slightly lower scores.

In terms of platform flexibility, the i7-3540M uses the Intel Socket G2 (988B) and is built on the Ivy Bridge architecture, while the i7-860 uses Intel Socket 1156 and the older Nehalem architecture. The i7-3540M also has the newer 22 nm process node and a smaller die size of 118 mm², compared to the 45 nm process and 296 mm² die of the i7-860. These differences do not show up in the Cinebench scores, but they matter for real-world deployment. The i7-3540M is a more efficient part that generates less heat and consumes less power, making it suitable for thin-and-light laptops. The i7-860 is a desktop part that requires a dedicated cooling solution and a motherboard with the older Socket 1156 interface.

For users who already own a Socket 1156 system, the i7-860 offers a marginal performance upgrade path. For users building a new mobile system, the i7-3540M is the only one of the two that fits, and its integrated graphics eliminate the need for a separate GPU in basic configurations. The benchmark data does not show any workload where the i7-3540M pulls ahead, but the power envelope and feature set give it a clear usability advantage in portable contexts.

Architecture Differences

The architectural gap between these two processors spans three generations of Intel design philosophy. The i7-860 is built on the Nehalem architecture with the Lynnfield codename, while the i7-3540M uses Ivy Bridge. The process node tells the story: the i7-860 uses a 45 nm process, while the i7-3540M uses a much more advanced 22 nm process. This node shrink is directly responsible for the i7-3540M's lower power consumption and smaller physical footprint.

The i7-860 packs 774 million transistors into a die size of 296 mm². The i7-3540M has no transistor count listed in the database, but its die size is 118 mm², less than half the physical area of the i7-860. This is a dramatic illustration of how Intel's process improvements allowed for a more compact design while maintaining comparable performance per core. The i7-3540M achieves nearly identical benchmark scores to the i7-860 despite having half the cores and just over a quarter of the die area.

Cache configurations also differ significantly. Both processors share the same L1 cache size at 64 KB per core and the same L2 cache at 256 KB per core. The L3 cache, however, is where they diverge: the i7-860 has 8 MB of shared L3 cache, while the i7-3540M has only 4 MB. This 4 MB difference partially explains why the i7-860 can maintain a small lead in multi-threaded workloads even with its older architecture. The larger cache pool allows the four-core part to keep more working data close to the execution units.

The memory support is identical on paper: both use DDR3 memory with a dual-channel memory bus. Neither supports ECC memory. The PCIe interface differs, with the i7-860 supporting PCIe Gen 2 with 16 lanes (CPU only), while the i7-3540M has no PCIe information listed in the database. The i7-3540M compensates with integrated graphics, specifically Intel HD 4000, which is a feature entirely absent from the i7-860's specifications.

Neither processor has an unlocked multiplier, so both are locked to their factory clock settings. The base and boost clocks favor the i7-3540M, which runs at 3.00 GHz base and 3.70 GHz boost, compared to the i7-860 at 2.80 GHz base and 3.47 GHz boost. The higher clocks on the i7-3540M help it close the gap created by the i7-860's extra cores, but they are not enough to overcome the desktop part's advantage in multi-threaded workloads.

Specification Differences

The recorded specifications show several clear points of divergence between the two processors. The most obvious is core count: the i7-860 has 4 cores and 8 threads, while the i7-3540M has 2 cores and 4 threads. This is a direct consequence of their different market segments, with the i7-860 designed for desktop use and the i7-3540M for mobile.

Clock speeds differ in both directions. The i7-3540M has a higher base clock at 3.00 GHz versus 2.80 GHz for the i7-860, and a higher boost clock at 3.70 GHz versus 3.47 GHz. This gives the mobile part a frequency advantage that partially compensates for its lower core count.

The TDP difference is substantial: 95 watts for the i7-860 versus 35 watts for the i7-3540M. This is a nearly threefold difference in power consumption, and it is the primary reason the i7-3540M can exist in a laptop chassis while the i7-860 requires a desktop tower with active cooling.

The sockets are incompatible. The i7-860 uses Intel Socket 1156, while the i7-3540M uses Intel Socket G2 (988B). These are physically and electrically distinct sockets, meaning neither processor can be installed in a motherboard designed for the other.

Process technology is another major differentiator. The i7-860 is fabricated on a 45 nm node, while the i7-3540M uses a 22 nm node. The die size reflects this: 296 mm² for the i7-860 versus 118 mm² for the i7-3540M. The transistor count is listed for the i7-860 at 774 million, with no corresponding figure for the i7-3540M.

The L3 cache differs as noted above, with 8 MB on the i7-860 and 4 MB on the i7-3540M. Integrated graphics are present only on the i7-3540M in the form of Intel HD 4000. The i7-860 has no integrated graphics listed. PCIe support is listed for the i7-860 as Gen 2 with 16 lanes (CPU only), while the i7-3540M has no PCIe information in the database.

Release dates are roughly three and a half years apart. The i7-860 was released on September 7, 2009, while the i7-3540M was released on January 7, 2013. The i7-860 is marked as end-of-life in production status, while the i7-3540M has no production status listed. The part numbers are SLBJJ for the i7-860 and SR0X6 for the i7-3540M. Neither processor has a launch MSRP recorded in the database.

FAQ

Q: Which processor is faster in multi-core Cinebench R23?

A: The Intel Core i7-860 scores 2574 in Cinebench R23 multi-core, while the Intel Core i7-3540M scores 2525. The i7-860 wins by 1.9 percent.

Q: How do the single-core scores compare?

A: The i7-860 leads in both recorded single-core tests. In Cinebench R23 single-core, it scores 363 versus 356 for the i7-3540M, a 2 percent advantage. In Cinebench R20 single-core, it scores 152 versus 149, also a 2 percent lead.

Q: Does the i7-3540M have any advantages over the i7-860?

A: Yes. The i7-3540M has a much lower TDP at 35 watts versus 95 watts, a smaller die size at 118 mm² versus 296 mm², a newer 22 nm process node versus 45 nm, higher base and boost clocks (3.00/3.70 GHz versus 2.80/3.47 GHz), and integrated graphics in the form of Intel HD 4000, which the i7-860 lacks.

Q: What is the average benchmark score difference between the two?

A: The i7-860 has an average benchmark score of 886, while the i7-3540M averages 867. The i7-860 sits at the 24th percentile of all CPUs, and the i7-3540M sits at the 23rd percentile.

Q: Are the two processors compatible with the same motherboards?

A: No. The i7-860 uses Intel Socket 1156, while the i7-3540M uses Intel Socket G2 (988B). These are different sockets and are not interchangeable.

Q: How many benchmarks does each processor win in the head-to-head comparison?

A: The i7-860 wins all 5 recorded head-to-head benchmarks, while the i7-3540M wins 0. The largest margin is 2 percent, and the smallest is 1.9 percent in Cinebench R23 multi-core.